{"gene":"SGK3","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":1999,"finding":"SGK3 (SGKL/CISK) was cloned and characterized as a novel isoform of SGK with a catalytic domain 80% identical to SGK1 and SGK2; it is activated in vitro by PDK1 via phosphorylation of Thr-253 (activation loop), and this activation is potentiated by mutation of Ser-419 to Asp (hydrophobic motif site). SGK3 mRNA is ubiquitously expressed and is not upregulated by serum or glucocorticoids.","method":"Molecular cloning, in vitro kinase assays, site-directed mutagenesis, Northern blotting","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with mutagenesis, foundational characterization paper","pmids":["10548550"],"is_preprint":false},{"year":1999,"finding":"SGK3 (SGKL) was mapped to human chromosome 8q12.3-q13.1 and encodes a protein sharing 67% amino acid identity with rat SGK and 66% with human SGK1; a 4.4-kb transcript is detected in 16 human tissues with highest abundance in lung.","method":"Molecular cloning, radiation hybrid mapping, Northern blotting","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 — initial cloning and chromosomal localization; single lab","pmids":["10585774"],"is_preprint":false},{"year":2001,"finding":"The PX domain of CISK/SGK3 binds phosphoinositides including PtdIns(3,5)P2 and PtdIns(3,4,5)P3 and is required for targeting SGK3 to the endosomal compartment. Mutation of the PX domain that abolishes phospholipid binding disrupts endosomal localization and decreases SGK3 kinase activity in vivo, demonstrating that the PX domain regulates SGK3 localization and activity through phosphoinositide interaction.","method":"Lipid-binding assays, confocal live-cell imaging, PX domain mutagenesis, kinase activity assays","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (lipid binding, localization, mutagenesis, activity) in single rigorous study","pmids":["11514587"],"is_preprint":false},{"year":2002,"finding":"SGK3 (SGKL) phosphorylates GSK-3β at Ser-9 in vitro and interacts with GSK-3β, as identified by yeast two-hybrid screening and confirmed by co-immunoprecipitation in HEK293 cells; wild-type but not kinase-dead SGK3 is required for this phosphorylation.","method":"Yeast two-hybrid, co-immunoprecipitation, in vitro kinase assay with phospho-specific antibody","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP plus in vitro kinase assay; single lab","pmids":["12054501"],"is_preprint":false},{"year":2003,"finding":"SGK2 and SGK3 stimulate the epithelial Na+ channel ENaC in Xenopus oocytes, increasing amiloride-sensitive current comparably to SGK1. Mutation of the SGK consensus phosphorylation site in α-ENaC (S622A) did not abolish the stimulatory effect, indicating SGK3 acts through indirect mechanisms rather than direct phosphorylation of the channel subunit.","method":"Dual-electrode voltage-clamp in Xenopus oocytes, site-directed mutagenesis","journal":"Pflugers Archiv : European journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 — electrophysiology with mutagenesis in expression system; single lab","pmids":["12632189"],"is_preprint":false},{"year":2004,"finding":"SGK3 stimulates the Na+-coupled glucose transporter SGLT1 in Xenopus oocytes and phosphorylates Nedd4-2; the constitutively active isoform SGK3 enhances SGLT1-mediated glucose-induced current and reverses the inhibitory effect of co-expressed Nedd4-2. Deletion of SGK/PKB phosphorylation sites in Nedd4-2 blunted kinase effects, placing Nedd4-2 as a direct SGK3 substrate in this pathway.","method":"Xenopus oocyte electrophysiology, in vitro kinase assay, Nedd4-2 mutagenesis","journal":"Obesity research","confidence":"Medium","confidence_rationale":"Tier 2 — electrophysiology plus kinase assay plus mutagenesis; single lab","pmids":["15166308"],"is_preprint":false},{"year":2004,"finding":"Targeted disruption of Sgk3 in mice causes defective postnatal hair follicle morphogenesis. Null mice show reduced proliferation and loss of nuclear β-catenin accumulation in hair bulb keratinocytes; heterologous expression of SGK3 in cultured keratinocytes potently modulates β-catenin/Lef-1-mediated gene transcription, establishing a role for SGK3 in the β-catenin pathway during hair follicle development.","method":"Gene-targeted knockout mice, histology, BrdU proliferation assay, immunostaining for β-catenin, luciferase reporter assay in keratinocytes","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined phenotype plus mechanistic reporter assay; replicated by independent lab (Alonso et al. 2005)","pmids":["15240817"],"is_preprint":false},{"year":2004,"finding":"SGK3 regulates the epithelial Ca2+ channel TRPV5 in Xenopus oocytes: co-expression of SGK3 with TRPV5 and NHERF2 stimulates Ca2+ uptake and Ca2+-induced currents. The effect is mimicked by SGK1 but not by SGK2 or PKB, and requires kinase activity (inactive SGK1 K127N is ineffective).","method":"Xenopus oocyte electrophysiology, tracer Ca2+ flux, kinase-dead mutants","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — functional electrophysiology with mutagenesis controls; single lab","pmids":["15319523"],"is_preprint":false},{"year":2005,"finding":"Sgk3 knockout mice display decreased intestinal Na+-coupled glucose transport as measured in Ussing chamber preparations, lower fasting plasma glucose, and increased food intake, establishing SGK3 as required for adequate intestinal SGLT1-mediated glucose absorption in vivo.","method":"Sgk3 knockout mice, Ussing chamber electrophysiology, plasma glucose measurements","journal":"Pflugers Archiv : European journal of physiology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined in vivo physiological readout; corroborates in vitro data","pmids":["15971077"],"is_preprint":false},{"year":2005,"finding":"SGK3 links growth factor signaling to maintenance of transiently amplifying hair follicle matrix progenitor cells; Sgk3-null mice show reduced proliferation, increased apoptosis, and premature follicle regression resembling a gain-of-function of EGF signaling. In cultured primary keratinocytes, Sgk3 negatively regulates PI3K signaling.","method":"Sgk3 knockout mice, BrdU/TUNEL labeling, growth factor stimulation in primary keratinocytes","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with proliferation/apoptosis readouts, replicated across two independent Sgk3-null mouse lines","pmids":["16103225"],"is_preprint":false},{"year":2005,"finding":"SGK1 and SGK3, but not SGK2 or PKB, increase SLC6A8 (creatine transporter) activity in Xenopus oocytes by increasing maximal transport rate without altering substrate affinity; constitutively active SGK3 (S419D) but not inactive (K119N) is effective.","method":"Xenopus oocyte electrophysiology, kinetic analysis, constitutively active/inactive mutants","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — electrophysiology with kinetic analysis and mutagenesis; single lab","pmids":["16036218"],"is_preprint":false},{"year":2005,"finding":"SGK3 increases EAAT5 (excitatory amino acid transporter 5) activity and cell-surface abundance in Xenopus oocytes by ~1.5–2-fold; PKB does not share this activity, indicating isoform specificity.","method":"Xenopus oocyte electrophysiology, chemiluminescence cell-surface assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — dual-readout (current + surface expression); single lab","pmids":["15737648"],"is_preprint":false},{"year":2006,"finding":"Both a functional PX domain and PI3K activation are necessary for phosphorylation of SGK3 at Thr-320 (PDK1 site) and Ser-486 (hydrophobic motif). PDK1 phosphorylates endosome-associated SGK3 at Thr-320; diverting SGK3 to the plasma membrane interferes with PDK1 phosphorylation. A chimeric protein with the hydrophobic motif of PRK2 is constitutively active, and SGK3 activation becomes PX domain-independent once the HM is phosphorylated.","method":"Subcellular fractionation, phospho-specific antibodies, domain-swap chimeras, constitutively active/inactive mutants, in vitro PDK1 kinase assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — mechanistic dissection with multiple mutants and in vitro reconstitution; clearly identifies the endosomal PDK1 activation mechanism","pmids":["16790420"],"is_preprint":false},{"year":2006,"finding":"SGK3 increases HERG (Kv11.1) channel current and plasma membrane protein abundance in Xenopus oocytes without affecting gating kinetics; SGK1 does not share this activity. Mutation of both SGK consensus sites in HERG decreases basal current but does not abolish the SGK3 stimulatory effect, suggesting an indirect mechanism involving increased channel abundance.","method":"Xenopus oocyte voltage-clamp, chemiluminescence surface expression, site-directed mutagenesis","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — electrophysiology plus surface expression assay with mutagenesis; single lab","pmids":["17167223"],"is_preprint":false},{"year":2006,"finding":"CISK/SGK3, activated downstream of PI3K-PDK1 on endosomes, attenuates lysosomal degradation of CXCR4 by inhibiting its sorting from early endosomes to lysosomes. CISK interacts and co-localizes with the E3 ubiquitin ligase AIP4, phosphorylates specific AIP4 sites in vitro, and this interaction and CISK kinase activity are both required for inhibition of CXCR4 degradation.","method":"Co-immunoprecipitation, confocal microscopy, in vitro kinase assay, siRNA knockdown, receptor degradation assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods (Co-IP, localization, in vitro kinase, degradation assays) in single study; mechanistically rigorous","pmids":["16888620"],"is_preprint":false},{"year":2006,"finding":"SGK3 and stargazin independently regulate GluR1 AMPA receptor surface expression and glutamate-induced currents in Xenopus oocytes via distinct pathways; their effects are additive (15.5-fold combined vs. ~4-fold each alone). Mutation of the SGK consensus site in stargazin does not prevent SGK3 from further stimulating GluR1 current.","method":"Xenopus oocyte voltage-clamp, Western blotting, site-directed mutagenesis","journal":"Pflugers Archiv : European journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 — electrophysiology plus biochemistry with mutagenesis; single lab","pmids":["16485113"],"is_preprint":false},{"year":2006,"finding":"Renal function in SGK1/SGK3 double-knockout mice reveals partial compensation between isoforms: double-null mice have lower blood pressure, higher aldosterone, and greater NaCl excretion during salt deprivation than either single knockout, demonstrating SGK1 and SGK3 cooperate in renal NaCl retention.","method":"Double-knockout mouse genetics, metabolic caging, blood pressure telemetry, plasma aldosterone measurement","journal":"American journal of physiology. Regulatory, integrative and comparative physiology","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with quantitative physiological readouts in double-KO mice","pmids":["16537821"],"is_preprint":false},{"year":2009,"finding":"Akt2 and SGK3 act redundantly in postnatal hair follicle development. Akt2/SGK3 double-knockout mice have markedly worse hair growth defects than either single knockout, with failure of matrix cell β-catenin nuclear accumulation and proliferation at morphogenesis onset. In keratinocytes, both Akt2 and SGK3 stimulate a β-catenin-LEF1 transcriptional reporter, indicating redundant regulation of this pathway.","method":"Double-knockout mouse genetics, immunostaining for β-catenin, BrdU proliferation, luciferase reporter assay","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis in double-KO plus mechanistic reporter; corroborates prior SGK3 KO work","pmids":["19433625"],"is_preprint":false},{"year":2010,"finding":"SGK3 is an estrogen receptor (ER) transcriptional target in breast cancer cells. ERα binds to two regions at the sgk3 locus (identified by ChIP-seq) and stimulates sgk3 promoter activity upon E2 stimulation. SGK3 knockdown reduces estrogen-mediated survival of MCF-7 cells, and SGK3 overexpression partially protects against antiestrogen-induced apoptosis.","method":"ChIP-seq, promoter-luciferase assays, siRNA knockdown, flow cytometry for apoptosis","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 2 — ChIP-seq plus functional promoter assays plus loss-of-function phenotype; multiple orthogonal methods","pmids":["21084382"],"is_preprint":false},{"year":2011,"finding":"SGK3 and Akt2 double-knockout mice reveal a novel role of SGK3 in pancreatic β-cell function: DKO mice have worse glucose homeostasis than Akt2 single nulls due to impaired β-cell function (lower insulin/C-peptide, reduced β-cell mass, impaired glucose-stimulated insulin secretion), not increased insulin resistance. SGK3 is strongly expressed in normal islets and its loss dramatically reduces β-catenin expression in islets.","method":"Double-knockout mouse genetics, glucose/insulin tolerance tests, ELISA for insulin/C-peptide, β-cell mass morphometry","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with quantitative metabolic phenotyping in double-KO mice","pmids":["21980074"],"is_preprint":false},{"year":2012,"finding":"SGK3 deficiency in dendritic cells reduces store-operated Ca2+ (SOC) entry triggered by thapsigargin, LPS, and CXCL12, decreases SOC channel currents, and lowers STIM2 protein abundance (without affecting Orai1, Orai2, STIM1, TRPC1). DC migration toward CXCL12 and CCL21 is impaired in sgk3−/− mice, linking SGK3 to STIM2-dependent SOC entry and chemotaxis.","method":"Sgk3 knockout bone-marrow-derived DCs, Ca2+ imaging (Fura-2), patch-clamp electrophysiology, Western blotting, migration transwell assays","journal":"Cellular physiology and biochemistry","confidence":"High","confidence_rationale":"Tier 2 — clean KO with multiple orthogonal mechanistic readouts (Ca2+ imaging, patch-clamp, protein expression, migration)","pmids":["23171960"],"is_preprint":false},{"year":2013,"finding":"SGK1 and SGK3 increase hERG channel expression and current in HEK293 cells by phosphorylating and inhibiting Nedd4-2 AND by promoting Rab11-mediated hERG recycling. Disruption of the Nedd4-2 binding site in hERG only partially eliminates SGK effects; additional disruption of Rab11 completely eliminates the SGK-mediated increase, establishing a dual mechanism.","method":"hERG-HEK stable cell line, patch-clamp, Western blotting, ubiquitination assay, dominant-negative Rab11","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — mechanistic dissection with mutagenesis plus dominant-negative approach identifying two parallel mechanisms","pmids":["23589291"],"is_preprint":false},{"year":2014,"finding":"SGK3 is the only protein kinase known to interact specifically with PtdIns(3)P via its PX domain. Mutations disrupting PtdIns(3)P binding ablate SGK3 kinase activity by preventing phosphorylation at both the T-loop (PDK1 site) and hydrophobic motif (mTOR site). The selective Vps34 inhibitor VPS34-IN1 induces rapid (~1 min) ~50–60% loss of SGK3 phosphorylation without affecting Akt, demonstrating that Vps34-generated PtdIns(3)P at endosomes is required for SGK3 activation. Class I PI3K inhibitors suppress SGK3 activity ~40%, suggesting a second PtdIns(3)P pool derived from dephosphorylation of PtdIns(3,4,5)P3 via SHIP1/2 and INPP4B.","method":"Selective Vps34 inhibitor (VPS34-IN1), PX domain point mutants, class I PI3K inhibitors (GDC-0941, BKM120), phospho-SGK3 immunoblotting in cells","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1-2 — selective chemical probes combined with mutagenesis and pharmacological epistasis; >250 citations","pmids":["25177796"],"is_preprint":false},{"year":2014,"finding":"SGK3 is amplified in breast cancer and activated downstream of PIK3CA in an INPP4B-dependent, Akt-independent manner. INPP4B expression leads to enhanced SGK3 activation with suppression of Akt phosphorylation. SGK3 is required for 3D proliferation, invasive migration, and tumorigenesis in vivo, and targets the metastasis suppressor NDRG1 for Fbw7-mediated degradation.","method":"Genomic copy-number analysis, PI3K inhibitors, siRNA knockdown, 3D Matrigel, xenograft tumor models, NDRG1 ubiquitination assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (genomics, KD, 3D culture, in vivo xenograft, substrate degradation); >125 citations","pmids":["25458846"],"is_preprint":false},{"year":2014,"finding":"SGK3 is an androgen receptor (AR) transcriptional target in prostate cancer cells. DHT/AR induces SGK3 expression requiring co-activation by estrogen receptor (ER); ER depletion blocks DHT-induced SGK3 expression. SGK3 knockdown decreases LNCaP proliferation by blocking G1-S transition, and SGK3 promotes p70 S6 kinase activation and increases cyclin D1 levels.","method":"ChIP, promoter-luciferase reporter, siRNA, flow cytometry cell-cycle analysis, Western blotting","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 2 — ChIP plus functional promoter assays plus loss-of-function with mechanistic readouts","pmids":["24739041"],"is_preprint":false},{"year":2014,"finding":"SGK3 upregulates the inwardly rectifying K+ channel Kir2.1 (KCNJ2) in Xenopus oocytes: wild-type and constitutively active S419D-SGK3 enhance Kir2.1-mediated currents and increase channel membrane protein abundance. The effect is abolished by SGK inhibitor EMD638683 and is independent of Na+/K+-ATPase. Brefeldin A experiments suggest SGK3 promotes channel insertion rather than preventing retrieval.","method":"Xenopus oocyte voltage-clamp, confocal immunostaining, chemiluminescence surface expression, brefeldin A insertion block","journal":"Cellular physiology and biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 — electrophysiology plus mechanistic membrane trafficking experiment; single lab","pmids":["24556932"],"is_preprint":false},{"year":2015,"finding":"PDK1 contributes to melanoma growth partly through SGK3; genetic or pharmacologic inhibition of PDK1 and SGK3 attenuates melanoma growth by inducing G1-phase cell-cycle arrest. Pan-PI3K inhibition synergizes with PDK1 inhibition, establishing SGK3 as an important mediator of PDK1 oncogenic activity in PTEN-wild-type melanoma.","method":"Genetic knockdown, pharmacologic inhibitors, cell-cycle analysis (FACS), xenograft models","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined cell-cycle phenotype and epistasis; single lab","pmids":["25712345"],"is_preprint":false},{"year":2016,"finding":"Prolonged PI3K or Akt inhibition in breast cancer cells leads to increased expression and activation of SGK3, which is controlled by hVps34-generated PtdIns(3)P binding to the PX domain. Under these conditions, SGK3 substitutes for Akt by phosphorylating TSC2 to activate mTORC1, thereby restoring mTORC1 signaling and proliferative output. A dual SGK+Akt inhibitor combination induced marked tumor regression in BT-474 xenografts.","method":"Prolonged drug treatment, Western blotting for phospho-SGK3 and mTORC1 substrates, TSC2 phosphorylation assays, siRNA, xenograft mouse model","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — mechanistic epistasis (Vps34/PtdIns(3)P/SGK3/TSC2/mTORC1) demonstrated biochemically and validated in vivo; >65 citations","pmids":["27481935"],"is_preprint":false},{"year":2017,"finding":"SGK3 promotes epithelial-mesenchymal transition in HCC cells and reduces phosphorylation-dependent degradation of β-catenin. miR-155 stimulates SGK3 expression by targeting and repressing P85α (a PI3K regulatory subunit), thereby removing its inhibitory effect on PI3K-AKT signaling, establishing a miR-155/PI3K/SGK3/β-catenin axis.","method":"miR-155 overexpression/inhibition, siRNA, Western blotting for EMT markers and β-catenin, luciferase reporter, immunofluorescence","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 3 — mechanistic pathway placement via knockdown/overexpression but no direct phosphorylation evidence for SGK3→β-catenin","pmids":["27602769"],"is_preprint":false},{"year":2017,"finding":"SGK3 sustains ERα signaling in aromatase inhibitor (AI)-resistant breast cancer by maintaining SERCA2b function and endoplasmic reticulum (ER) homeostasis. The PERK arm of the ER stress response downregulates ERα expression; SGK3 prevents excessive ER stress, thereby retaining ERα expression and signaling and driving AI resistance.","method":"AI-resistant cell lines, siRNA knockdown, ER stress markers (PERK, ATF4), SERCA2b functional assays, ERα expression analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — mechanistic link established with multiple pathway markers; single lab","pmids":["28174265"],"is_preprint":false},{"year":2018,"finding":"Endogenous SGK3 is rapidly activated by IGF1 through pathways involving both Class 1 and Class 3 PI3Ks: IGF1 enhances endosomal PtdIns(3)P via the UV-RAG/hVPS34 complex; Class 1 PI3K stimulates SGK3 through enhanced PtdIns(3)P production from dephosphorylation of PtdIns(3,4,5)P3 and through mTORC2-mediated phosphorylation of SGK3. Oncogenic Ras activates SGK3 solely through the Class 1 PI3K pathway.","method":"Endogenous SGK3 activation assays, selective Vps34 inhibitors, mTORC2 inhibitors/siRNA, PI3K inhibitors, phospho-SGK3 immunoblotting, PtdIns(3)P probes","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 — pharmacological and genetic dissection of multiple upstream pathways; multiple inhibitor combinations with clear mechanistic conclusions","pmids":["29150437"],"is_preprint":false},{"year":2019,"finding":"SGK3 mediates rapamycin resistance in breast cancer by reactivating the mTORC1/4EBP1 axis: rapamycin activates SGK3 in a hVps34- and mTORC2-dependent manner, and SGK3 phosphorylates TSC2 to reactivate mTORC1, restoring 4EBP1 phosphorylation and cap-dependent translation. SGK3 deletion combined with Akt inhibition almost completely blocks 4EBP1 re-phosphorylation and suppresses growth in vivo.","method":"SGK3 CRISPR knockout, phosphoproteomics, xenograft, TSC2 phosphorylation assay, cap-dependent translation assay","journal":"International journal of biological sciences","confidence":"High","confidence_rationale":"Tier 2 — CRISPR KO plus in vivo validation plus biochemical substrate identification","pmids":["31182914"],"is_preprint":false},{"year":2019,"finding":"SGK3-PROTAC1, a PROTAC conjugate of an SGK inhibitor with a VHL ligand, selectively degrades SGK3 (not SGK1 or SGK2) within 2–8 h at 0.3 μM. Proteomic analysis shows SGK3 is the only cellular protein significantly reduced. SGK3 degradation suppresses phosphorylation of the SGK3 substrate NDRG1 and restores sensitivity of SGK3-dependent breast cancer cells to Akt and PI3K inhibitors, more effectively than conventional inhibition alone.","method":"PROTAC synthesis, quantitative proteomics, phospho-NDRG1 Western blotting, cell proliferation assays","journal":"ACS chemical biology","confidence":"High","confidence_rationale":"Tier 1-2 — chemical degrader with proteome-wide selectivity profiling and functional validation; NDRG1 confirmed as SGK3 substrate","pmids":["31461270"],"is_preprint":false},{"year":2019,"finding":"Phosphoproteomic screens identified 40 novel SGK3 substrates including four endosomal proteins: STX7 (Ser126), STX12 (Ser139), RFIP4 (Ser527), and WDR44 (Ser346), which are efficiently phosphorylated in vitro by SGK3 but poorly by Akt due to an unfavorable n+1 residue. SGK3 phosphorylation of STX12 enhances its interaction with the VAMP4/VTI1A/STX6 SNARE complex and promotes STX12 plasma membrane localization.","method":"Quantitative phosphoproteomics, in vitro kinase assays, Phos-tag gel analysis, SGK3 CRISPR knockout, Co-immunoprecipitation, subcellular fractionation","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1-2 — phosphoproteomics plus in vitro validation plus KO confirmation plus SNARE complex interaction; rigorous mechanistic study","pmids":["31665227"],"is_preprint":false},{"year":2020,"finding":"PDPK1 (PDK1) mediates prostate cancer cell survival predominantly via SGK3 rather than Akt or SGK1: PDK1 knockdown significantly reduces SGK3 phosphorylation, and constitutively active SGK3 completely abrogates PDK1-knockdown-induced apoptosis, while constitutively active Akt does not, placing SGK3 as the primary survival effector of PDK1 in these cells.","method":"shRNA kinome library screen, siRNA, constitutively active SGK3/Akt rescue assays, PDK1 inhibitors, cell viability assays","journal":"Journal of cellular and molecular medicine","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with rescue experiment clearly placing SGK3 downstream of PDK1","pmids":["32926495"],"is_preprint":false},{"year":2020,"finding":"A mutation in SGK3 (c.979-96 T>A) causes exon 13 skipping and in-frame deletion of 29 amino acids including Thr-320 (the PDK1 phosphorylation site required for activation), leading to autosomal dominant hypophosphatemic rickets. Protein structural modeling predicts significant structural change in the kinase domain, establishing SGK3 as a regulator of renal phosphate transport.","method":"Exome sequencing, co-segregation analysis, RT-PCR splice assay, protein structure modeling","journal":"The Journal of clinical endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 2-3 — human genetics with splice/structural validation; no direct functional reconstitution but mechanistically informative","pmids":["31821448"],"is_preprint":false},{"year":2021,"finding":"In vitro reconstitution of SGK3 activation demonstrates that PtdIns(3)P binding to the PX domain induces large conformational changes in SGK3 that promote kinase activation, as revealed by hydrogen-deuterium exchange mass spectrometry. The PI3P-binding pocket of the PX domain is sequestered in the inactive conformation. SGK3 is regulated by a combination of phosphorylation and allosteric activation, and Vps34-mediated PtdIns(3)P synthesis on liposomes reconstitutes SGK3 activation in vitro.","method":"HDX-MS, in vitro reconstitution with liposomes + Vps34, biochemical activity assays, biophysics (SPR, ITC)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with structural/biophysical validation (HDX-MS) revealing allosteric activation mechanism","pmids":["34181950"],"is_preprint":false},{"year":2021,"finding":"SGK3 promotes vascular calcification in CKD by enhancing expression and activity of the sodium-dependent phosphate cotransporter Pit-1: SGK3 activates Pit-1 mRNA transcription via NF-κB, inhibits Nedd4-2-mediated Pit-1 ubiquitination/degradation, and directly phosphorylates Pit-1 at Thr468 (confirmed by co-immunoprecipitation and in vitro kinase assay) to enhance phosphate uptake independently of increased Pit-1 protein.","method":"Sgk3 knockdown in VSMCs, uremic mouse model (AVF/aorta), Co-IP, in vitro kinase assay, ubiquitination assay, NF-κB reporter","journal":"Theranostics","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro kinase assay plus Co-IP plus in vivo model plus mechanistic NF-κB/Nedd4-2 dissection","pmids":["38169564"],"is_preprint":false},{"year":2022,"finding":"CDK9 directly binds and activates SGK3, as identified by quantitative phosphoproteomics and pulldown assay, confirmed by co-immunoprecipitation. CDK9 promotes cardiac repair after myocardial infarction by directly activating SGK3 and the downstream GSK-3β/β-catenin pathway to stimulate cardiomyocyte cell cycle re-entry.","method":"Quantitative phosphoproteomics, pulldown assay, Co-IP, CDK9 overexpression/knockdown in cardiomyocytes, neonatal mouse apical resection/MI models","journal":"Frontiers in cardiovascular medicine","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP plus in vivo cardiac model; CDK9→SGK3 direct activation not yet confirmed by in vitro kinase assay","pmids":["36082129"],"is_preprint":false},{"year":2023,"finding":"SGK3 functions as an antioxidant factor in cervical cancer cells harboring PIK3CA helical domain mutations: SGK3 is activated by oxidative stress, interacts with and phosphorylates catalase to promote its tetrameric state and enzymatic activity, and phosphorylates GSK3β to protect catalase from GSK3β/β-TrCP-mediated ubiquitination and proteasomal degradation. SGK3 inhibition potentiates CDK4/6 inhibitor cytotoxicity and overcomes cisplatin resistance through ROS-mediated mechanisms.","method":"Co-IP, in vitro kinase assay, ubiquitination assay, native PAGE (tetramer analysis), ROS measurement, drug combination assays","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro kinase assay plus Co-IP plus ubiquitination dissection plus native PAGE structural analysis; multiple orthogonal approaches","pmids":["37866161"],"is_preprint":false},{"year":2024,"finding":"SGK3 deficiency in macrophages attenuates angiotensin II-induced cardiac remodeling. Mechanistically, SGK3 absence reduces IL-1β secretion by inhibiting the NLRP3/Caspase-1/IL-1β pathway in macrophages, which consequently suppresses Ndufa13 expression and mitochondrial oxidative stress in cardiomyocytes and fibroblasts. Macrophage-specific SGK3 conditional knockout (Lyz2-CRE) was used to establish macrophage-autonomous effects.","method":"Macrophage-specific SGK3 conditional KO (Lyz2-CRE), Ang II infusion cardiac model, RNA sequencing, NLRP3 inflammasome assays, co-culture system","journal":"Cellular and molecular life sciences","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with mechanistic dissection via RNA-seq and inflammasome assays; single lab","pmids":["39158709"],"is_preprint":false},{"year":2025,"finding":"SGK3 promotes β-catenin accumulation and ER+ breast cancer proliferation through a STAT3/ZMIZ2 axis: SGK3 activates STAT3, leading to ZMIZ2 transcription; ZMIZ2 binds and stabilizes β-catenin; SGK3 knockdown causes β-catenin polyubiquitination/degradation that is reversed by ZMIZ2 overexpression. Identified by proteomics as an SGK3 downstream target.","method":"Quantitative proteomics, ChIP (p-STAT3 at ZMIZ2 promoter), Co-IP (ZMIZ2-β-catenin), siRNA/overexpression, tissue microarray immunofluorescence","journal":"British journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 — proteomics-driven discovery plus ChIP and Co-IP validation; single lab","pmids":["39876548"],"is_preprint":false},{"year":2025,"finding":"SGK3 promotes breast cancer stemness and alpelisib resistance by activating the GSK3β/β-catenin signaling pathway; SGK3 is upregulated in alpelisib-resistant cells, and its inhibition restores sensitivity to alpelisib.","method":"Alpelisib-resistant cell model, Western blotting for GSK3β/β-catenin pathway, spheroid/tumor formation assays, SGK3 inhibitor treatment","journal":"International journal of biological sciences","confidence":"Low","confidence_rationale":"Tier 3 — single lab, no direct phosphorylation evidence; mechanistic pathway placement via inhibitors/KD only","pmids":["40303291"],"is_preprint":false},{"year":2024,"finding":"SGK3 is required for TLR7 signaling in plasmacytoid dendritic cells: VPS34-IN1-mediated blockade of SGK3 endosomal recruitment prevents TLR7-dependent type-I IFN induction, identifying endosomal SGK3 as necessary for innate immune TLR7 signal transduction.","method":"VPS34-IN1 pharmacological inhibition, SGK3 localization assays, TLR7 stimulation, type-I IFN ELISA/reporter in human pDCs","journal":"bioRxiv (preprint)","confidence":"Low","confidence_rationale":"Tier 3 — pharmacological inhibitor (not SGK3-selective), preprint, single lab","pmids":[],"is_preprint":true}],"current_model":"SGK3 is a PI3K-dependent AGC serine/threonine kinase that is recruited and allosterically activated at endosomes through PtdIns(3)P binding to its N-terminal PX domain, whereupon PDK1 phosphorylates Thr-320 and mTORC2 phosphorylates Ser-486 in the hydrophobic motif; PtdIns(3)P is supplied by two routes—Vps34-mediated direct synthesis at endosomes and dephosphorylation of the class I PI3K product PtdIns(3,4,5)P3 via SHIP1/2 and INPP4B; once active, SGK3 phosphorylates substrates including TSC2 (activating mTORC1), NDRG1 (targeting it for Fbw7-mediated degradation), Nedd4-2 (increasing surface abundance of ENaC, SGLT1, hERG, and other channels/transporters), AIP4 (inhibiting CXCR4 lysosomal sorting), catalase (promoting its tetrameric active state and preventing GSK3β/β-TrCP-mediated degradation), Pit-1 (enhancing phosphate uptake), STX7 and STX12 (regulating endosomal SNARE complex assembly), and GSK-3β (activating β-catenin/Wnt signaling); SGK3 acts as a key Akt-independent effector of oncogenic PI3K signaling and mediates resistance to class I PI3K and Akt inhibitors by substituting for lost Akt activity to maintain mTORC1 and proliferative signaling."},"narrative":{"teleology":[{"year":1999,"claim":"Identification of SGK3 as a novel PDK1-activated AGC kinase isoform established that the SGK family contains three members with distinct regulation—unlike SGK1, SGK3 is not serum- or glucocorticoid-inducible.","evidence":"Molecular cloning, in vitro kinase reconstitution with PDK1, site-directed mutagenesis, Northern blotting across human tissues","pmids":["10548550","10585774"],"confidence":"High","gaps":["No endogenous substrate identified","No information on upstream lipid signals governing activation","Tissue-specific functions unknown"]},{"year":2001,"claim":"Discovery that the PX domain binds phosphoinositides and is required for endosomal targeting and kinase activity resolved the question of how SGK3 is spatially regulated and distinguished it from SGK1/SGK2.","evidence":"Lipid-binding assays, confocal live-cell imaging, PX domain mutagenesis ablating both localization and activity","pmids":["11514587"],"confidence":"High","gaps":["Specific phosphoinositide species driving endosomal activation not determined","Structural basis of PX-phosphoinositide interaction unknown","Identity of the kinase phosphorylating the hydrophobic motif unresolved"]},{"year":2004,"claim":"Sgk3 knockout mice revealed an essential in vivo role in β-catenin–dependent hair follicle morphogenesis, providing the first genetic loss-of-function phenotype and linking SGK3 to Wnt/β-catenin signaling.","evidence":"Gene-targeted KO mice with histology, BrdU proliferation, β-catenin immunostaining, Lef-1 reporter in keratinocytes","pmids":["15240817","16103225"],"confidence":"High","gaps":["Direct SGK3 substrate mediating β-catenin nuclear accumulation not identified","Whether SGK3 phosphorylates GSK-3β in vivo to stabilize β-catenin not confirmed","Redundancy with Akt isoforms not yet tested"]},{"year":2004,"claim":"Demonstration that SGK3 stimulates ENaC, SGLT1, and other channels/transporters via Nedd4-2 phosphorylation established a general mechanism by which SGK3 increases surface transporter abundance through E3 ligase inhibition.","evidence":"Xenopus oocyte electrophysiology with constitutively active/inactive SGK3 mutants, Nedd4-2 phosphosite mutagenesis","pmids":["12632189","15166308"],"confidence":"Medium","gaps":["All transporter studies performed in Xenopus oocytes, not mammalian cells","Relative contribution of Nedd4-2 versus other trafficking mechanisms unclear","In vivo relevance for most channels not established"]},{"year":2006,"claim":"Mechanistic dissection showed that PX domain-mediated endosomal recruitment is a prerequisite for PDK1 phosphorylation of Thr-320, and that artificially diverting SGK3 to the plasma membrane disrupts activation—demonstrating that SGK3 activation is spatially restricted to endosomes.","evidence":"Subcellular fractionation, phospho-specific antibodies, domain-swap chimeras, in vitro PDK1 kinase assay","pmids":["16790420"],"confidence":"High","gaps":["Identity of the hydrophobic motif kinase still unresolved at this point","Structure of the PX-kinase domain interface unknown","How PDK1 accesses endosomal SGK3 not determined"]},{"year":2006,"claim":"SGK3 was shown to inhibit CXCR4 lysosomal sorting by phosphorylating the E3 ligase AIP4 at endosomes, providing the first direct evidence that endosomal SGK3 regulates receptor trafficking and degradation.","evidence":"Co-IP, confocal colocalization, in vitro kinase assay identifying AIP4 phosphosites, siRNA knockdown, CXCR4 degradation assay","pmids":["16888620"],"confidence":"High","gaps":["AIP4 phosphosites not mapped to specific residues in this study","Whether SGK3 regulates trafficking of other GPCRs unknown","In vivo significance of CXCR4 stabilization not tested"]},{"year":2009,"claim":"Akt2/SGK3 double-knockout mice demonstrated functional redundancy between the two kinases in hair follicle β-catenin signaling, establishing that AGC kinases cooperate to maintain Wnt pathway output in vivo.","evidence":"Double-KO mouse genetics with β-catenin immunostaining, BrdU labeling, Lef-1 reporter","pmids":["19433625"],"confidence":"High","gaps":["Whether the redundancy extends to other tissues remains untested","Direct shared substrates mediating β-catenin stabilization not identified"]},{"year":2014,"claim":"Use of a selective Vps34 inhibitor (VPS34-IN1) proved that Vps34-generated PtdIns(3)P is the primary endosomal lipid activating SGK3, while a second PtdIns(3)P pool derived from class I PI3K product dephosphorylation (via SHIP1/2, INPP4B) also contributes, resolving the upstream lipid input question.","evidence":"VPS34-IN1 inducing rapid SGK3 dephosphorylation, class I PI3K inhibitors causing partial SGK3 loss, PX domain mutant epistasis","pmids":["25177796"],"confidence":"High","gaps":["Relative flux through each PtdIns(3)P-generating pathway not quantified","Cell-type variation in pathway dependency unknown"]},{"year":2014,"claim":"SGK3 was identified as an amplified oncogene in breast cancer activated via INPP4B-dependent, Akt-independent PI3K signaling; it promotes tumorigenesis by phosphorylating NDRG1 for Fbw7-mediated degradation, establishing SGK3 as a driver of PI3K oncogenic signaling that can bypass Akt.","evidence":"Genomic copy-number analysis, siRNA, 3D Matrigel, xenograft, NDRG1 ubiquitination and degradation assays","pmids":["25458846"],"confidence":"High","gaps":["Whether NDRG1 phosphorylation is sufficient for tumor-promoting effects not determined","Patient stratification biomarkers for SGK3-driven tumors not developed"]},{"year":2016,"claim":"The critical question of how cancer cells resist PI3K/Akt inhibitors was answered by showing that prolonged inhibition upregulates SGK3, which phosphorylates TSC2 to reactivate mTORC1 independently of Akt, providing the mechanistic basis for drug resistance.","evidence":"Prolonged PI3K/Akt inhibitor treatment, phospho-SGK3/TSC2/S6K Western blotting, siRNA epistasis, BT-474 xenograft with dual SGK+Akt inhibitor","pmids":["27481935"],"confidence":"High","gaps":["Specific TSC2 phosphosite(s) targeted by SGK3 not fully mapped","Clinical validation of combined SGK3+Akt inhibition not yet performed"]},{"year":2019,"claim":"Phosphoproteomics identified endosomal SNAREs (STX7, STX12) as SGK3-specific substrates poorly phosphorylated by Akt, revealing that SGK3 directly regulates endosomal membrane fusion and explaining its unique endosomal function.","evidence":"Quantitative phosphoproteomics, in vitro kinase assays with substrate specificity comparison, SGK3 CRISPR KO, Co-IP of STX12/SNARE complex","pmids":["31665227"],"confidence":"High","gaps":["Functional consequence of STX7 phosphorylation on trafficking not characterized","Whether SNARE phosphorylation contributes to SGK3 oncogenic functions unknown"]},{"year":2020,"claim":"A human SGK3 splice mutation eliminating the PDK1 phosphorylation site was shown to cause autosomal dominant hypophosphatemic rickets, establishing SGK3 as essential for renal phosphate handling and providing the first Mendelian disease link.","evidence":"Exome sequencing with family co-segregation, RT-PCR splice assay confirming exon 13 skipping and loss of Thr-320","pmids":["31821448"],"confidence":"Medium","gaps":["No functional reconstitution (e.g., kinase activity of mutant protein, rescue in cells)","Mechanism linking SGK3 to phosphate reabsorption not yet identified at molecular level","Single family reported"]},{"year":2021,"claim":"In vitro reconstitution with HDX-MS revealed the allosteric mechanism of SGK3 activation: PtdIns(3)P binding to the PX domain induces large conformational changes that expose the activation loop, explaining why membrane recruitment and phosphorylation are obligatorily coupled.","evidence":"HDX-MS structural analysis, liposome reconstitution with Vps34, SPR/ITC biophysics","pmids":["34181950"],"confidence":"High","gaps":["No high-resolution crystal or cryo-EM structure of full-length SGK3 available","Conformational dynamics during substrate engagement not resolved"]},{"year":2023,"claim":"SGK3 was shown to function as an antioxidant regulator by directly phosphorylating catalase to promote its tetrameric active state and by phosphorylating GSK-3β to prevent β-TrCP-mediated catalase degradation, linking SGK3 to redox homeostasis and chemoresistance.","evidence":"In vitro kinase assay, Co-IP, native PAGE for catalase tetramer, ubiquitination assay, ROS measurement, drug combination assays in PIK3CA-mutant cervical cancer cells","pmids":["37866161"],"confidence":"High","gaps":["Catalase phosphosite(s) not mapped","In vivo relevance of SGK3-catalase axis not tested","Generalizability beyond PIK3CA-mutant cervical cancer unknown"]},{"year":null,"claim":"Key unresolved questions include the high-resolution structure of full-length SGK3, whether SGK3 endosomal SNARE phosphorylation contributes to its oncogenic functions, clinical validation of combined SGK3/Akt/PI3K inhibitor strategies, and the molecular mechanism by which SGK3 loss causes hypophosphatemic rickets.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length SGK3 atomic structure","Clinical-grade selective SGK3 inhibitor not yet available","Mechanism of SGK3-dependent renal phosphate reabsorption uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,3,5,14,33,37,39]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[2,22,36]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[2,12,14,22,33,36]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,12]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,12,22,27,30]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[23,27,31,32,39,42]},{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[14,33]},{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[5,8,37]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[6,9,17]}],"complexes":[],"partners":["PDPK1","NEDD4L","AIP4","GSK3B","TSC2","NDRG1","STX12","STX7"],"other_free_text":[]},"mechanistic_narrative":"SGK3 is a PI3K-dependent AGC family serine/threonine kinase that is uniquely recruited to endosomes via PtdIns(3)P binding to its N-terminal PX domain, where it undergoes allosteric activation and sequential phosphorylation by PDK1 (Thr-320) and mTORC2 (Ser-486) [PMID:10548550, PMID:16790420, PMID:34181950]. PtdIns(3)P is supplied by Vps34-mediated synthesis at endosomes and by sequential dephosphorylation of PtdIns(3,4,5)P3 via SHIP1/2 and INPP4B, enabling SGK3 to function as a critical Akt-independent effector of oncogenic PI3K signaling that phosphorylates TSC2 to reactivate mTORC1, NDRG1 to promote its Fbw7-mediated degradation, Nedd4-2 to increase surface abundance of ion channels and transporters (ENaC, hERG, SGLT1), AIP4 to inhibit CXCR4 lysosomal sorting, and endosomal SNAREs (STX7, STX12) to regulate vesicle fusion [PMID:25177796, PMID:27481935, PMID:25458846, PMID:16888620, PMID:31665227]. SGK3 cooperates with Akt2 in β-catenin–dependent hair follicle morphogenesis and pancreatic β-cell function, and its transcriptional upregulation by ERα and AR in hormone-dependent cancers drives resistance to PI3K, Akt, and aromatase inhibitors [PMID:15240817, PMID:21980074, PMID:21084382, PMID:31182914]. A loss-of-function splice mutation eliminating the PDK1 phosphorylation site causes autosomal dominant hypophosphatemic rickets, establishing SGK3 as essential for renal phosphate homeostasis [PMID:31821448]."},"prefetch_data":{"uniprot":{"accession":"Q96BR1","full_name":"Serine/threonine-protein kinase Sgk3","aliases":["Cytokine-independent survival kinase","Serum/glucocorticoid-regulated kinase 3","Serum/glucocorticoid-regulated kinase-like"],"length_aa":496,"mass_kda":57.1,"function":"Serine/threonine-protein kinase which is involved in the regulation of a wide variety of ion channels, membrane transporters, cell growth, proliferation, survival and migration. Up-regulates Na(+) channels: SCNN1A/ENAC and SCN5A, K(+) channels: KCNA3/KV1.3, KCNE1, KCNQ1 and KCNH2/HERG, epithelial Ca(2+) channels: TRPV5 and TRPV6, chloride channel: BSND, creatine transporter: SLC6A8, Na(+)/dicarboxylate cotransporter: SLC13A2/NADC1, Na(+)-dependent phosphate cotransporter: SLC34A2/NAPI-2B, amino acid transporters: SLC1A5/ASCT2 and SLC6A19, glutamate transporters: SLC1A3/EAAT1, SLC1A6/EAAT4 and SLC1A7/EAAT5, glutamate receptors: GRIA1/GLUR1 and GRIK2/GLUR6, Na(+)/H(+) exchanger: SLC9A3/NHE3, and the Na(+)/K(+) ATPase. Plays a role in the regulation of renal tubular phosphate transport and bone density. Phosphorylates NEDD4L and GSK3B. Positively regulates ER transcription activity through phosphorylation of FLII. Negatively regulates the function of ITCH/AIP4 via its phosphorylation and thereby prevents CXCR4 from being efficiently sorted to lysosomes","subcellular_location":"Cytoplasmic vesicle; Early endosome; Recycling endosome","url":"https://www.uniprot.org/uniprotkb/Q96BR1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SGK3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SGK3","total_profiled":1310},"omim":[{"mim_id":"607591","title":"SERUM/GLUCOCORTICOID-REGULATED KINASE 3; SGK3","url":"https://www.omim.org/entry/607591"},{"mim_id":"607589","title":"SERUM/GLUCOCORTICOID-REGULATED KINASE 2; SGK2","url":"https://www.omim.org/entry/607589"},{"mim_id":"602958","title":"SERUM/GLUCOCORTICOID-REGULATED KINASE 1; SGK1","url":"https://www.omim.org/entry/602958"},{"mim_id":"300036","title":"SOLUTE CARRIER FAMILY 6 (NEUROTRANSMITTER TRANSPORTER, CREATINE), MEMBER 8; SLC6A8","url":"https://www.omim.org/entry/300036"},{"mim_id":"193100","title":"HYPOPHOSPHATEMIC RICKETS, AUTOSOMAL DOMINANT; ADHR","url":"https://www.omim.org/entry/193100"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SGK3"},"hgnc":{"alias_symbol":[],"prev_symbol":["SGK2","SGKL"]},"alphafold":{"accession":"Q96BR1","domains":[{"cath_id":"3.30.1520.10","chopping":"13-121","consensus_level":"high","plddt":87.1906,"start":13,"end":121},{"cath_id":"3.30.200.20","chopping":"158-242_453-480","consensus_level":"high","plddt":83.6299,"start":158,"end":480},{"cath_id":"1.10.510.10","chopping":"247-428","consensus_level":"high","plddt":95.0426,"start":247,"end":428}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96BR1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96BR1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96BR1-F1-predicted_aligned_error_v6.png","plddt_mean":83.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SGK3","jax_strain_url":"https://www.jax.org/strain/search?query=SGK3"},"sequence":{"accession":"Q96BR1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96BR1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96BR1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96BR1"}},"corpus_meta":[{"pmid":"25177796","id":"PMC_25177796","title":"Characterization of VPS34-IN1, a selective inhibitor of Vps34, reveals that the phosphatidylinositol 3-phosphate-binding SGK3 protein kinase is a downstream target of class III phosphoinositide 3-kinase.","date":"2014","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/25177796","citation_count":254,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"15166308","id":"PMC_15166308","title":"Regulation of glucose transporter SGLT1 by ubiquitin ligase Nedd4-2 and kinases SGK1, SGK3, and PKB.","date":"2004","source":"Obesity research","url":"https://pubmed.ncbi.nlm.nih.gov/15166308","citation_count":150,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"25458846","id":"PMC_25458846","title":"SGK3 mediates INPP4B-dependent PI3K signaling in breast cancer.","date":"2014","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/25458846","citation_count":128,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"24009430","id":"PMC_24009430","title":"AKT-independent PI3-K signaling in cancer - 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Mutations disrupting PtdIns(3)P binding to the PX domain of SGK3 ablate kinase activity by suppressing phosphorylation of the T-loop (PDK1 site) and hydrophobic motif (mTOR site).\",\n      \"method\": \"Selective Vps34 inhibitor (VPS34-IN1), class I PI3K inhibitors (GDC-0941, BKM120), PX domain point mutants, in-cell phosphorylation assays\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — pharmacological and genetic dissection with orthogonal inhibitors and domain-loss mutants; replicated by multiple independent approaches in same study\",\n      \"pmids\": [\"25177796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SGK3 is activated by a combination of phosphorylation and allosteric activation: binding of PtdIns(3)P to the PX domain induces large conformational changes associated with activation, and the PI3P-binding pocket of the PX domain is sequestered in the inactive conformation. SGK3 activation was reconstituted in vitro via Vps34-mediated PI3P synthesis on phosphatidylinositol liposomes.\",\n      \"method\": \"Hydrogen-deuterium exchange mass spectrometry, in vitro reconstitution with Vps34 and PI liposomes, biochemical and biophysical assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution combined with HDX-MS structural analysis in a single rigorous study\",\n      \"pmids\": [\"34181950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Endogenous SGK3 is activated by IGF1 through both Class 1 and Class 3 PI3Ks: Class 3 (hVPS34) is engaged via the UV-RAG complex to enhance endosomal PtdIns(3)P; Class 1 PI3K stimulates SGK3 through PtdIns(3)P produced by dephosphorylation of PtdIns(3,4,5)P3, and also promotes mTORC2-mediated phosphorylation of SGK3. Oncogenic Ras activates SGK3 solely through Class 1 PI3K.\",\n      \"method\": \"Pharmacological inhibitors of Class 1 and Class 3 PI3Ks, mTORC2 inhibitors, dominant-negative constructs, phospho-SGK3 immunoblotting\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal pharmacological and genetic perturbations; multiple upstream pathways dissected\",\n      \"pmids\": [\"29150437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Under prolonged PI3K or Akt inhibition, SGK3 is upregulated and activated by hVps34-generated PtdIns(3)P. Activated SGK3 substitutes for Akt by phosphorylating TSC2 to activate mTORC1, thereby restoring proliferative signaling in breast cancer cells.\",\n      \"method\": \"SGK3 knockdown/overexpression, PDK1/mTOR inhibitors, VPS34 inhibitor, TSC2 phosphorylation assays, xenograft tumor model\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including in vivo xenograft; epistasis placed SGK3 at TSC2 upstream of mTORC1\",\n      \"pmids\": [\"27481935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SGK3 is amplified in breast cancer and activated downstream of PIK3CA in an INPP4B-dependent manner. INPP4B expression leads to enhanced SGK3 activation and suppression of Akt phosphorylation. SGK3 targets the metastasis suppressor NDRG1 for degradation by Fbw7.\",\n      \"method\": \"Overexpression and knockdown of INPP4B and SGK3, 3D proliferation assays, invasive migration, xenograft in vivo, phospho-SGK3 and NDRG1 immunoblotting\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in vitro and in vivo; NDRG1/Fbw7 substrate relationship established\",\n      \"pmids\": [\"25458846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Phosphoproteomic screens identified novel SGK3-specific endosomal substrates: Syntaxin-7 (STX7, Ser126), Syntaxin-12 (STX12, Ser139), RFIP4 (Ser527), and WDR44 (Ser346), which are efficiently phosphorylated by SGK3 in vitro and in vivo but poorly by Akt due to an unfavorable n+1 residue. SGK3 phosphorylation of STX12 enhanced its interaction with the VAMP4/VTI1A/STX6 SNARE complex and promoted plasma membrane localization.\",\n      \"method\": \"Genetic and pharmacological phosphoproteomics, in vitro kinase assays, SGK3 knockout cells, Phos-tag analysis, co-immunoprecipitation, confocal imaging\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase assays plus phosphoproteomic screens plus KO validation and SNARE complex Co-IP\",\n      \"pmids\": [\"31665227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"SGK3 (SGKL) directly phosphorylates GSK-3β at Ser9 through a direct interaction; the interaction was confirmed by yeast two-hybrid and co-immunoprecipitation in HEK293 cells, and in vitro kinase activity was demonstrated with a GSK-3 crosstide fusion protein.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, in vitro kinase assay with phospho-specific antibody\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase assay with Co-IP, single lab\",\n      \"pmids\": [\"12054501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SGK3 stimulates ENaC activity in Xenopus oocytes; the effect does not require direct phosphorylation of alphaENaC (S622A mutation did not abolish stimulation), indicating an indirect mechanism. SGK3 and SGK1 similarly phosphorylated Nedd4-2, and deletion of SGK/PKB phosphorylation sites in Nedd4-2 blunted kinase effects on SGLT1.\",\n      \"method\": \"Xenopus oocyte voltage clamp, site-directed mutagenesis, Nedd4-2 phosphorylation assay\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology / Obesity research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology with mutagenesis; ENaC mechanism shown to be indirect via Nedd4-2\",\n      \"pmids\": [\"12632189\", \"15166308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SGK3 increases hERG channel expression by two mechanisms: inhibiting Nedd4-2-mediated ubiquitination (through Nedd4-2 phosphorylation) and promoting Rab11-dependent recycling of mature hERG channels to the plasma membrane. Disruption of both pathways was required to abolish SGK-mediated hERG increase.\",\n      \"method\": \"Overexpression in HEK293 cells, Rab11 dominant-negative, Nedd4-2 binding site mutations, surface biotinylation, patch clamp\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal dissection of two mechanisms (Nedd4-2 and Rab11) with mutagenesis and dominant-negatives\",\n      \"pmids\": [\"23589291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SGK3 knockout mice display a postnatal hair follicle morphogenesis defect preceded by reduced proliferation and reduced nuclear accumulation of β-catenin in hair bulb keratinocytes. In cultured keratinocytes, SGK3 overexpression potently stimulates β-catenin/Lef-1-mediated gene transcription.\",\n      \"method\": \"Sgk3 null mice, BrdU proliferation assay, immunostaining for β-catenin, luciferase reporter assay (β-catenin/Lef-1)\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined phenotype and mechanistic link to β-catenin/Lef-1 transcription\",\n      \"pmids\": [\"15240817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Sgk3 is required for maintenance of hair follicle progenitor (matrix) cells; Sgk3-null follicles show reduced proliferation, increased apoptosis, and premature regression. In cultured keratinocytes, Sgk3 functions by negatively regulating PI3K signaling.\",\n      \"method\": \"Sgk3 knockout mice, BrdU labeling, TUNEL apoptosis, hair cycle analysis, primary keratinocyte culture\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined cellular phenotypes and pathway placement\",\n      \"pmids\": [\"16103225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SGK3 and Akt2 cooperatively regulate postnatal hair follicle morphogenesis via redundant regulation of β-catenin-dependent transcription; Akt2/SGK3 double-knockout mice have markedly worse hair defects than either single knockout, with failure to accumulate nuclear β-catenin in follicle matrix cells.\",\n      \"method\": \"Akt2/SGK3 double-knockout mice, nuclear β-catenin immunostaining, proliferation assays, β-catenin-LEF1 luciferase reporter in keratinocytes\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis via double KO with mechanistic validation in reporter assay\",\n      \"pmids\": [\"19433625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SGK3 plays a role in pancreatic β-cell function, revealed in Akt2/SGK3 double-knockout mice: DKO mice show lower plasma insulin, reduced β-cell mass, impaired glucose-stimulated insulin secretion, and dramatically reduced β-catenin expression in islets compared to Akt2 single-null mice.\",\n      \"method\": \"Akt2/SGK3 double-knockout mice, GSIS assay, insulin/C-peptide ELISA, β-catenin immunostaining in islets\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis via double KO with multiple functional β-cell readouts\",\n      \"pmids\": [\"21980074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SGK3 is an estrogen receptor (ERα) transcriptional target in breast cancer cells; ERα binds two regions at the SGK3 locus (identified by ChIP-seq) and stimulates SGK3 promoter activity. SGK3 knockdown impairs E2-mediated cell survival in MCF-7 cells.\",\n      \"method\": \"ChIP-seq, promoter luciferase assay, siRNA knockdown, E2 dose-response, cell survival assays\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq plus functional promoter assay plus loss-of-function with survival phenotype\",\n      \"pmids\": [\"21084382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SGK3 is an androgen receptor (AR) transcriptional target in prostate cancer; AR binds an identified region at the SGK3 locus and drives SGK3 expression in a manner requiring estrogen receptors. SGK3 knockdown reduces LNCaP proliferation by blocking G1-S progression; SGK3 activates p70 S6 kinase and increases cyclin D1 levels.\",\n      \"method\": \"ChIP assay, promoter reporter assay, siRNA knockdown, cell cycle analysis, p70S6K and cyclin D1 immunoblotting\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP, promoter assay, KD with cell cycle and substrate readouts\",\n      \"pmids\": [\"24739041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SGK3 maintains endoplasmic reticulum homeostasis by preserving SERCA2b function in aromatase inhibitor-resistant breast cancer cells, thereby preventing PERK-arm ER stress-mediated downregulation of ERα and sustaining ERα signaling.\",\n      \"method\": \"SGK3 knockdown/overexpression, SERCA2b activity assays, ER stress marker immunoblotting, ERα protein quantification, cell survival\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic link from SGK3 to SERCA2b to ER stress to ERα with multiple orthogonal assays\",\n      \"pmids\": [\"28174265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SGK3-PROTAC1, a PROTAC conjugate of the SGK inhibitor 308-R with the VHL E3 ligase ligand, selectively degrades endogenous SGK3 (not SGK1 or SGK2) within 2–8 h, reducing phosphorylation of the SGK3 substrate NDRG1, and restores breast cancer cell sensitivity to Akt and PI3K inhibitors.\",\n      \"method\": \"PROTAC degrader, quantitative proteomics, NDRG1 phospho-immunoblotting, cell proliferation assays, cis-epimer control\",\n      \"journal\": \"ACS chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isoform-selective degrader with proteomic validation and functional rescue experiments\",\n      \"pmids\": [\"31461270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SGK3 mediates feedback reactivation of mTORC1/4EBP1 following rapamycin treatment in breast cancer by phosphorylating TSC2; this feedback activation is dependent on hVps34 and mTORC2. Combined SGK3 deletion and Akt inhibition almost completely blocked rapamycin-induced 4EBP1 re-phosphorylation.\",\n      \"method\": \"SGK3 CRISPR KO, TSC2 phosphorylation assays, cap-dependent translation assays, xenograft model, phosphoproteomic correlation in clinical samples\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with mechanistic TSC2 phosphorylation readout, in vivo validation, clinical correlation\",\n      \"pmids\": [\"31182914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SGK3 functions as an antioxidant factor by stabilizing and activating catalase: SGK3 phosphorylates catalase, promoting its tetrameric state and activity; simultaneously SGK3 phosphorylates GSK3β to protect catalase from GSK3β-β-TrCP-mediated ubiquitination and proteasomal degradation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assays, ubiquitination assays, catalase activity measurement, ROS measurement, SGK3 inhibition rescue experiments\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase assay, co-IP, ubiquitination assay, and functional catalase activity measurements\",\n      \"pmids\": [\"37866161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CDK9 directly binds and activates SGK3; CDK9 overexpression promotes cardiomyocyte proliferation and cardiac repair after MI via SGK3 and the downstream GSK-3β/β-catenin pathway, while CDK9 inhibition shortens the cardiac regeneration window.\",\n      \"method\": \"Phosphoproteomics, pulldown assay, co-immunoprecipitation, CDK9 KO/overexpression in neonatal and adult mice, apical resection and MI models\",\n      \"journal\": \"Frontiers in cardiovascular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus in vivo genetic models; single lab\",\n      \"pmids\": [\"36082129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SGK3 promotes β-catenin accumulation by suppressing GSK-3β-mediated β-catenin degradation in liver cancer stem cells, leading to CSC expansion; prolonged class I PI3K inhibition activates SGK3 (via hVps34) to further expand liver CSCs via this mechanism.\",\n      \"method\": \"Spheroid formation, flow cytometry, SGK3 knockdown/overexpression, GSK-3β and β-catenin phospho-immunoblotting, Vps34 inhibitor\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic chain demonstrated with pharmacological and genetic perturbations; single lab\",\n      \"pmids\": [\"29940988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SGK3 knockout mice show decreased intestinal Na+-coupled glucose transport (SGLT1 activity), lower fasting plasma glucose, and increased food intake, establishing SGK3 as required for adequate intestinal glucose absorption in vivo.\",\n      \"method\": \"Sgk3 null mice, Ussing chamber electrophysiology, plasma glucose measurement\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with defined transport phenotype in native tissue\",\n      \"pmids\": [\"15971077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SGK3 (S419D constitutively active form) increases creatine transporter SLC6A8 activity by increasing maximal transport rate (Vmax) in Xenopus oocytes; inactive SGK3 has no effect, and SGK2 does not mimic this effect.\",\n      \"method\": \"Xenopus oocyte electrophysiology, kinetic analysis, constitutively active/inactive mutants\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean kinase-dead vs. active mutagenesis in functional assay; single lab\",\n      \"pmids\": [\"16036218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SGK3-deficient dendritic cells show reduced store-operated Ca2+ (SOC) entry, reduced currents through SOC channels, and decreased migration toward CXCL12 and CCL21. STIM2 protein abundance was significantly lower in SGK3-null DCs, while STIM1, Orai1/2 levels were unaffected, implicating SGK3-dependent upregulation of STIM2 in SOC entry.\",\n      \"method\": \"Sgk3 knockout mice, Ca2+ imaging with thapsigargin/LPS/CXCL12, patch clamp, Western blot for STIM/Orai proteins, DC migration assay\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with multiple functional readouts and molecular mechanism via STIM2\",\n      \"pmids\": [\"23171960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SGK3 promotes vascular calcification in CKD by enhancing expression and activity of Pit-1 (sodium-dependent phosphate cotransporter): SGK3 activates Pit-1 mRNA transcription via NF-κB, inhibits Nedd4-2-mediated ubiquitin-proteasome degradation of Pit-1, and directly phosphorylates Pit-1 at Thr468 (in loop7) to enhance phosphate uptake.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, siRNA knockdown, uremic mouse model, calcium deposition assay, NF-κB reporter\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase assay confirming Pit-1 Thr468 phosphorylation, Co-IP, in vivo model\",\n      \"pmids\": [\"38169564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SGK3 regulates the podocalyxin (PC)/ezrin complex stability in podocytes via Nedd4-2: SGK3 activity inhibits Nedd4-2, reducing ubiquitin-proteasome degradation of ezrin; downregulation of SGK3 increases ezrin ubiquitination and decreases PC/ezrin interaction.\",\n      \"method\": \"SGK3 knockdown/overexpression in podocytes, ubiquitination assays, Co-IP, puromycin aminonucleoside injury model in vivo and in vitro\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and ubiquitination assays with functional rescue; single lab\",\n      \"pmids\": [\"30385740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SGK3 increases HERG channel plasma membrane protein abundance in Xenopus oocytes, upregulating HERG current without affecting channel gating kinetics; mutation of SGK consensus sites in HERG partially decreased basal current but did not abolish SGK3 stimulation.\",\n      \"method\": \"Xenopus oocyte voltage clamp, chemiluminescence membrane protein assay, site-directed mutagenesis of HERG\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional electrophysiology with membrane abundance quantification and mutagenesis; single lab\",\n      \"pmids\": [\"17167223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SGK3 upregulates Kv1.5 (KCNA5) channel activity by counteracting Nedd4-2-mediated channel inhibition, promoting channel insertion into the cell membrane; constitutively active SGK3 but not inactive SGK3 enhances KCNA5 currents in Xenopus oocytes.\",\n      \"method\": \"Xenopus oocyte dual-electrode voltage clamp, constitutively active/inactive SGK3 mutants, Nedd4-2 co-expression, brefeldin A membrane insertion assay\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean active/inactive mutant dissection with Nedd4-2 epistasis and trafficking assay; single lab\",\n      \"pmids\": [\"26824455\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SGK3 phosphorylates PFK-2 at Ser466 and Ser483 in vitro, but siRNA knockdown of SGK3 in HEK293T cells does not affect insulin-induced heart PFK-2 activation, demonstrating that SGK3 is dispensable for insulin-induced PFK-2 activation in cells (which is instead mediated by PKBα).\",\n      \"method\": \"In vitro kinase assay with [γ-32P]ATP, siRNA knockdown in HEK293T, PDK1 docking-site mutant mice, PKB-specific inhibitor Akti-1/2\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay plus multiple genetic models; defined non-redundancy of SGK3 vs PKBα\",\n      \"pmids\": [\"20687898\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SGK3 in hair follicles requires Ser486 phosphorylation (C-terminal hydrophobic motif) for activation; a nonsense mutation truncating SGK3 before Ser486 in YPC mice causes defective hair growth. SGK3 expression is localized to the inner root sheath of growing follicles by in situ hybridization.\",\n      \"method\": \"Genetic mapping, sequencing of mutant allele, in situ hybridization, comparison with Sgk3 null phenotype\",\n      \"journal\": \"The American journal of pathology / DNA research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — allelic series with defined activation-site requirement; partially overlapping with KO phenotype\",\n      \"pmids\": [\"16565488\", \"15871460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Double knockout of SGK1 and SGK3 leads to mildly impaired renal NaCl retention during salt depletion (greater than either single KO) and lower blood pressure, demonstrating partial functional redundancy between SGK1 and SGK3 in renal ion transport.\",\n      \"method\": \"SGK1/SGK3 double-knockout mice, urinary electrolyte excretion, plasma aldosterone, blood pressure measurements\",\n      \"journal\": \"American journal of physiology. Regulatory, integrative and comparative physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis via double KO with defined physiological phenotype; redundancy clearly demonstrated\",\n      \"pmids\": [\"16537821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SGK3 and stargazin regulate GluR1 (AMPA receptor) abundance and glutamate-induced currents in Xenopus oocytes via independent, additive pathways; mutation of the SGK consensus site in stargazin does not prevent SGK3 stimulation, and the two proteins regulate membrane insertion at different time points.\",\n      \"method\": \"Xenopus oocyte voltage clamp, Western blotting, site-directed mutagenesis of stargazin, co-expression experiments\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology with mutagenesis showing independent pathways; single lab\",\n      \"pmids\": [\"16485113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SGK3 deficiency in macrophages attenuates Ang II-induced cardiac remodeling by reducing IL-1β secretion through inhibition of the NLRP3/Caspase-1/IL-1β pathway, which consequently suppresses upregulated Ndufa13 expression and mitochondrial oxidative stress in cardiomyocytes and fibroblasts.\",\n      \"method\": \"Macrophage-specific SGK3 conditional KO mice (Lyz2-CRE), Ang II infusion model, RNA-seq, co-culture system, NLRP3/IL-1β immunoblotting\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO with mechanistic pathway identification via RNA-seq; single lab\",\n      \"pmids\": [\"39158709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PDPK1 (PDK1) mediates prostate cancer cell survival predominantly via activation of SGK3 (not Akt): PDK1 knockdown reduces SGK3 phosphorylation, and constitutively active SGK3 completely abrogates the apoptosis induced by PDK1 knockdown.\",\n      \"method\": \"shRNA library screen, PDK1 siRNA knockdown, constitutively active SGK3 rescue, SGK3 phospho-immunoblotting, cell death assays\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis shown by rescue with constitutively active SGK3; single lab\",\n      \"pmids\": [\"32926495\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SGK3 is a PX domain-containing serine/threonine kinase recruited and allosterically activated at endosomes by PtdIns(3)P generated by both Vps34 (class III PI3K) and by dephosphorylation of class I PI3K-derived PtdIns(3,4,5)P3; once recruited, PDK1 phosphorylates the T-loop and mTORC2 phosphorylates the hydrophobic motif to fully activate the kinase, which then phosphorylates substrates overlapping with Akt (TSC2, NDRG1, GSK-3β) as well as unique endosomal substrates (STX7, STX12, Pit-1, catalase), regulating mTORC1 activation, membrane trafficking, ion transport, redox homeostasis, and β-catenin-dependent transcription in contexts ranging from hair follicle morphogenesis to cancer therapy resistance.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"SGK3 (SGKL/CISK) was cloned and characterized as a novel isoform of SGK with a catalytic domain 80% identical to SGK1 and SGK2; it is activated in vitro by PDK1 via phosphorylation of Thr-253 (activation loop), and this activation is potentiated by mutation of Ser-419 to Asp (hydrophobic motif site). SGK3 mRNA is ubiquitously expressed and is not upregulated by serum or glucocorticoids.\",\n      \"method\": \"Molecular cloning, in vitro kinase assays, site-directed mutagenesis, Northern blotting\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with mutagenesis, foundational characterization paper\",\n      \"pmids\": [\"10548550\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"SGK3 (SGKL) was mapped to human chromosome 8q12.3-q13.1 and encodes a protein sharing 67% amino acid identity with rat SGK and 66% with human SGK1; a 4.4-kb transcript is detected in 16 human tissues with highest abundance in lung.\",\n      \"method\": \"Molecular cloning, radiation hybrid mapping, Northern blotting\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — initial cloning and chromosomal localization; single lab\",\n      \"pmids\": [\"10585774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The PX domain of CISK/SGK3 binds phosphoinositides including PtdIns(3,5)P2 and PtdIns(3,4,5)P3 and is required for targeting SGK3 to the endosomal compartment. Mutation of the PX domain that abolishes phospholipid binding disrupts endosomal localization and decreases SGK3 kinase activity in vivo, demonstrating that the PX domain regulates SGK3 localization and activity through phosphoinositide interaction.\",\n      \"method\": \"Lipid-binding assays, confocal live-cell imaging, PX domain mutagenesis, kinase activity assays\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (lipid binding, localization, mutagenesis, activity) in single rigorous study\",\n      \"pmids\": [\"11514587\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"SGK3 (SGKL) phosphorylates GSK-3β at Ser-9 in vitro and interacts with GSK-3β, as identified by yeast two-hybrid screening and confirmed by co-immunoprecipitation in HEK293 cells; wild-type but not kinase-dead SGK3 is required for this phosphorylation.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, in vitro kinase assay with phospho-specific antibody\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus in vitro kinase assay; single lab\",\n      \"pmids\": [\"12054501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"SGK2 and SGK3 stimulate the epithelial Na+ channel ENaC in Xenopus oocytes, increasing amiloride-sensitive current comparably to SGK1. Mutation of the SGK consensus phosphorylation site in α-ENaC (S622A) did not abolish the stimulatory effect, indicating SGK3 acts through indirect mechanisms rather than direct phosphorylation of the channel subunit.\",\n      \"method\": \"Dual-electrode voltage-clamp in Xenopus oocytes, site-directed mutagenesis\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology with mutagenesis in expression system; single lab\",\n      \"pmids\": [\"12632189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SGK3 stimulates the Na+-coupled glucose transporter SGLT1 in Xenopus oocytes and phosphorylates Nedd4-2; the constitutively active isoform SGK3 enhances SGLT1-mediated glucose-induced current and reverses the inhibitory effect of co-expressed Nedd4-2. Deletion of SGK/PKB phosphorylation sites in Nedd4-2 blunted kinase effects, placing Nedd4-2 as a direct SGK3 substrate in this pathway.\",\n      \"method\": \"Xenopus oocyte electrophysiology, in vitro kinase assay, Nedd4-2 mutagenesis\",\n      \"journal\": \"Obesity research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology plus kinase assay plus mutagenesis; single lab\",\n      \"pmids\": [\"15166308\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Targeted disruption of Sgk3 in mice causes defective postnatal hair follicle morphogenesis. Null mice show reduced proliferation and loss of nuclear β-catenin accumulation in hair bulb keratinocytes; heterologous expression of SGK3 in cultured keratinocytes potently modulates β-catenin/Lef-1-mediated gene transcription, establishing a role for SGK3 in the β-catenin pathway during hair follicle development.\",\n      \"method\": \"Gene-targeted knockout mice, histology, BrdU proliferation assay, immunostaining for β-catenin, luciferase reporter assay in keratinocytes\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined phenotype plus mechanistic reporter assay; replicated by independent lab (Alonso et al. 2005)\",\n      \"pmids\": [\"15240817\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SGK3 regulates the epithelial Ca2+ channel TRPV5 in Xenopus oocytes: co-expression of SGK3 with TRPV5 and NHERF2 stimulates Ca2+ uptake and Ca2+-induced currents. The effect is mimicked by SGK1 but not by SGK2 or PKB, and requires kinase activity (inactive SGK1 K127N is ineffective).\",\n      \"method\": \"Xenopus oocyte electrophysiology, tracer Ca2+ flux, kinase-dead mutants\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional electrophysiology with mutagenesis controls; single lab\",\n      \"pmids\": [\"15319523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Sgk3 knockout mice display decreased intestinal Na+-coupled glucose transport as measured in Ussing chamber preparations, lower fasting plasma glucose, and increased food intake, establishing SGK3 as required for adequate intestinal SGLT1-mediated glucose absorption in vivo.\",\n      \"method\": \"Sgk3 knockout mice, Ussing chamber electrophysiology, plasma glucose measurements\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined in vivo physiological readout; corroborates in vitro data\",\n      \"pmids\": [\"15971077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SGK3 links growth factor signaling to maintenance of transiently amplifying hair follicle matrix progenitor cells; Sgk3-null mice show reduced proliferation, increased apoptosis, and premature follicle regression resembling a gain-of-function of EGF signaling. In cultured primary keratinocytes, Sgk3 negatively regulates PI3K signaling.\",\n      \"method\": \"Sgk3 knockout mice, BrdU/TUNEL labeling, growth factor stimulation in primary keratinocytes\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with proliferation/apoptosis readouts, replicated across two independent Sgk3-null mouse lines\",\n      \"pmids\": [\"16103225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SGK1 and SGK3, but not SGK2 or PKB, increase SLC6A8 (creatine transporter) activity in Xenopus oocytes by increasing maximal transport rate without altering substrate affinity; constitutively active SGK3 (S419D) but not inactive (K119N) is effective.\",\n      \"method\": \"Xenopus oocyte electrophysiology, kinetic analysis, constitutively active/inactive mutants\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology with kinetic analysis and mutagenesis; single lab\",\n      \"pmids\": [\"16036218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SGK3 increases EAAT5 (excitatory amino acid transporter 5) activity and cell-surface abundance in Xenopus oocytes by ~1.5–2-fold; PKB does not share this activity, indicating isoform specificity.\",\n      \"method\": \"Xenopus oocyte electrophysiology, chemiluminescence cell-surface assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — dual-readout (current + surface expression); single lab\",\n      \"pmids\": [\"15737648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Both a functional PX domain and PI3K activation are necessary for phosphorylation of SGK3 at Thr-320 (PDK1 site) and Ser-486 (hydrophobic motif). PDK1 phosphorylates endosome-associated SGK3 at Thr-320; diverting SGK3 to the plasma membrane interferes with PDK1 phosphorylation. A chimeric protein with the hydrophobic motif of PRK2 is constitutively active, and SGK3 activation becomes PX domain-independent once the HM is phosphorylated.\",\n      \"method\": \"Subcellular fractionation, phospho-specific antibodies, domain-swap chimeras, constitutively active/inactive mutants, in vitro PDK1 kinase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mechanistic dissection with multiple mutants and in vitro reconstitution; clearly identifies the endosomal PDK1 activation mechanism\",\n      \"pmids\": [\"16790420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SGK3 increases HERG (Kv11.1) channel current and plasma membrane protein abundance in Xenopus oocytes without affecting gating kinetics; SGK1 does not share this activity. Mutation of both SGK consensus sites in HERG decreases basal current but does not abolish the SGK3 stimulatory effect, suggesting an indirect mechanism involving increased channel abundance.\",\n      \"method\": \"Xenopus oocyte voltage-clamp, chemiluminescence surface expression, site-directed mutagenesis\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology plus surface expression assay with mutagenesis; single lab\",\n      \"pmids\": [\"17167223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"CISK/SGK3, activated downstream of PI3K-PDK1 on endosomes, attenuates lysosomal degradation of CXCR4 by inhibiting its sorting from early endosomes to lysosomes. CISK interacts and co-localizes with the E3 ubiquitin ligase AIP4, phosphorylates specific AIP4 sites in vitro, and this interaction and CISK kinase activity are both required for inhibition of CXCR4 degradation.\",\n      \"method\": \"Co-immunoprecipitation, confocal microscopy, in vitro kinase assay, siRNA knockdown, receptor degradation assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods (Co-IP, localization, in vitro kinase, degradation assays) in single study; mechanistically rigorous\",\n      \"pmids\": [\"16888620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"SGK3 and stargazin independently regulate GluR1 AMPA receptor surface expression and glutamate-induced currents in Xenopus oocytes via distinct pathways; their effects are additive (15.5-fold combined vs. ~4-fold each alone). Mutation of the SGK consensus site in stargazin does not prevent SGK3 from further stimulating GluR1 current.\",\n      \"method\": \"Xenopus oocyte voltage-clamp, Western blotting, site-directed mutagenesis\",\n      \"journal\": \"Pflugers Archiv : European journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology plus biochemistry with mutagenesis; single lab\",\n      \"pmids\": [\"16485113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Renal function in SGK1/SGK3 double-knockout mice reveals partial compensation between isoforms: double-null mice have lower blood pressure, higher aldosterone, and greater NaCl excretion during salt deprivation than either single knockout, demonstrating SGK1 and SGK3 cooperate in renal NaCl retention.\",\n      \"method\": \"Double-knockout mouse genetics, metabolic caging, blood pressure telemetry, plasma aldosterone measurement\",\n      \"journal\": \"American journal of physiology. Regulatory, integrative and comparative physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with quantitative physiological readouts in double-KO mice\",\n      \"pmids\": [\"16537821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Akt2 and SGK3 act redundantly in postnatal hair follicle development. Akt2/SGK3 double-knockout mice have markedly worse hair growth defects than either single knockout, with failure of matrix cell β-catenin nuclear accumulation and proliferation at morphogenesis onset. In keratinocytes, both Akt2 and SGK3 stimulate a β-catenin-LEF1 transcriptional reporter, indicating redundant regulation of this pathway.\",\n      \"method\": \"Double-knockout mouse genetics, immunostaining for β-catenin, BrdU proliferation, luciferase reporter assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis in double-KO plus mechanistic reporter; corroborates prior SGK3 KO work\",\n      \"pmids\": [\"19433625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SGK3 is an estrogen receptor (ER) transcriptional target in breast cancer cells. ERα binds to two regions at the sgk3 locus (identified by ChIP-seq) and stimulates sgk3 promoter activity upon E2 stimulation. SGK3 knockdown reduces estrogen-mediated survival of MCF-7 cells, and SGK3 overexpression partially protects against antiestrogen-induced apoptosis.\",\n      \"method\": \"ChIP-seq, promoter-luciferase assays, siRNA knockdown, flow cytometry for apoptosis\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP-seq plus functional promoter assays plus loss-of-function phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"21084382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SGK3 and Akt2 double-knockout mice reveal a novel role of SGK3 in pancreatic β-cell function: DKO mice have worse glucose homeostasis than Akt2 single nulls due to impaired β-cell function (lower insulin/C-peptide, reduced β-cell mass, impaired glucose-stimulated insulin secretion), not increased insulin resistance. SGK3 is strongly expressed in normal islets and its loss dramatically reduces β-catenin expression in islets.\",\n      \"method\": \"Double-knockout mouse genetics, glucose/insulin tolerance tests, ELISA for insulin/C-peptide, β-cell mass morphometry\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with quantitative metabolic phenotyping in double-KO mice\",\n      \"pmids\": [\"21980074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SGK3 deficiency in dendritic cells reduces store-operated Ca2+ (SOC) entry triggered by thapsigargin, LPS, and CXCL12, decreases SOC channel currents, and lowers STIM2 protein abundance (without affecting Orai1, Orai2, STIM1, TRPC1). DC migration toward CXCL12 and CCL21 is impaired in sgk3−/− mice, linking SGK3 to STIM2-dependent SOC entry and chemotaxis.\",\n      \"method\": \"Sgk3 knockout bone-marrow-derived DCs, Ca2+ imaging (Fura-2), patch-clamp electrophysiology, Western blotting, migration transwell assays\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with multiple orthogonal mechanistic readouts (Ca2+ imaging, patch-clamp, protein expression, migration)\",\n      \"pmids\": [\"23171960\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SGK1 and SGK3 increase hERG channel expression and current in HEK293 cells by phosphorylating and inhibiting Nedd4-2 AND by promoting Rab11-mediated hERG recycling. Disruption of the Nedd4-2 binding site in hERG only partially eliminates SGK effects; additional disruption of Rab11 completely eliminates the SGK-mediated increase, establishing a dual mechanism.\",\n      \"method\": \"hERG-HEK stable cell line, patch-clamp, Western blotting, ubiquitination assay, dominant-negative Rab11\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic dissection with mutagenesis plus dominant-negative approach identifying two parallel mechanisms\",\n      \"pmids\": [\"23589291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SGK3 is the only protein kinase known to interact specifically with PtdIns(3)P via its PX domain. Mutations disrupting PtdIns(3)P binding ablate SGK3 kinase activity by preventing phosphorylation at both the T-loop (PDK1 site) and hydrophobic motif (mTOR site). The selective Vps34 inhibitor VPS34-IN1 induces rapid (~1 min) ~50–60% loss of SGK3 phosphorylation without affecting Akt, demonstrating that Vps34-generated PtdIns(3)P at endosomes is required for SGK3 activation. Class I PI3K inhibitors suppress SGK3 activity ~40%, suggesting a second PtdIns(3)P pool derived from dephosphorylation of PtdIns(3,4,5)P3 via SHIP1/2 and INPP4B.\",\n      \"method\": \"Selective Vps34 inhibitor (VPS34-IN1), PX domain point mutants, class I PI3K inhibitors (GDC-0941, BKM120), phospho-SGK3 immunoblotting in cells\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — selective chemical probes combined with mutagenesis and pharmacological epistasis; >250 citations\",\n      \"pmids\": [\"25177796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SGK3 is amplified in breast cancer and activated downstream of PIK3CA in an INPP4B-dependent, Akt-independent manner. INPP4B expression leads to enhanced SGK3 activation with suppression of Akt phosphorylation. SGK3 is required for 3D proliferation, invasive migration, and tumorigenesis in vivo, and targets the metastasis suppressor NDRG1 for Fbw7-mediated degradation.\",\n      \"method\": \"Genomic copy-number analysis, PI3K inhibitors, siRNA knockdown, 3D Matrigel, xenograft tumor models, NDRG1 ubiquitination assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (genomics, KD, 3D culture, in vivo xenograft, substrate degradation); >125 citations\",\n      \"pmids\": [\"25458846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SGK3 is an androgen receptor (AR) transcriptional target in prostate cancer cells. DHT/AR induces SGK3 expression requiring co-activation by estrogen receptor (ER); ER depletion blocks DHT-induced SGK3 expression. SGK3 knockdown decreases LNCaP proliferation by blocking G1-S transition, and SGK3 promotes p70 S6 kinase activation and increases cyclin D1 levels.\",\n      \"method\": \"ChIP, promoter-luciferase reporter, siRNA, flow cytometry cell-cycle analysis, Western blotting\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus functional promoter assays plus loss-of-function with mechanistic readouts\",\n      \"pmids\": [\"24739041\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SGK3 upregulates the inwardly rectifying K+ channel Kir2.1 (KCNJ2) in Xenopus oocytes: wild-type and constitutively active S419D-SGK3 enhance Kir2.1-mediated currents and increase channel membrane protein abundance. The effect is abolished by SGK inhibitor EMD638683 and is independent of Na+/K+-ATPase. Brefeldin A experiments suggest SGK3 promotes channel insertion rather than preventing retrieval.\",\n      \"method\": \"Xenopus oocyte voltage-clamp, confocal immunostaining, chemiluminescence surface expression, brefeldin A insertion block\",\n      \"journal\": \"Cellular physiology and biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — electrophysiology plus mechanistic membrane trafficking experiment; single lab\",\n      \"pmids\": [\"24556932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PDK1 contributes to melanoma growth partly through SGK3; genetic or pharmacologic inhibition of PDK1 and SGK3 attenuates melanoma growth by inducing G1-phase cell-cycle arrest. Pan-PI3K inhibition synergizes with PDK1 inhibition, establishing SGK3 as an important mediator of PDK1 oncogenic activity in PTEN-wild-type melanoma.\",\n      \"method\": \"Genetic knockdown, pharmacologic inhibitors, cell-cycle analysis (FACS), xenograft models\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined cell-cycle phenotype and epistasis; single lab\",\n      \"pmids\": [\"25712345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Prolonged PI3K or Akt inhibition in breast cancer cells leads to increased expression and activation of SGK3, which is controlled by hVps34-generated PtdIns(3)P binding to the PX domain. Under these conditions, SGK3 substitutes for Akt by phosphorylating TSC2 to activate mTORC1, thereby restoring mTORC1 signaling and proliferative output. A dual SGK+Akt inhibitor combination induced marked tumor regression in BT-474 xenografts.\",\n      \"method\": \"Prolonged drug treatment, Western blotting for phospho-SGK3 and mTORC1 substrates, TSC2 phosphorylation assays, siRNA, xenograft mouse model\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic epistasis (Vps34/PtdIns(3)P/SGK3/TSC2/mTORC1) demonstrated biochemically and validated in vivo; >65 citations\",\n      \"pmids\": [\"27481935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SGK3 promotes epithelial-mesenchymal transition in HCC cells and reduces phosphorylation-dependent degradation of β-catenin. miR-155 stimulates SGK3 expression by targeting and repressing P85α (a PI3K regulatory subunit), thereby removing its inhibitory effect on PI3K-AKT signaling, establishing a miR-155/PI3K/SGK3/β-catenin axis.\",\n      \"method\": \"miR-155 overexpression/inhibition, siRNA, Western blotting for EMT markers and β-catenin, luciferase reporter, immunofluorescence\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — mechanistic pathway placement via knockdown/overexpression but no direct phosphorylation evidence for SGK3→β-catenin\",\n      \"pmids\": [\"27602769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SGK3 sustains ERα signaling in aromatase inhibitor (AI)-resistant breast cancer by maintaining SERCA2b function and endoplasmic reticulum (ER) homeostasis. The PERK arm of the ER stress response downregulates ERα expression; SGK3 prevents excessive ER stress, thereby retaining ERα expression and signaling and driving AI resistance.\",\n      \"method\": \"AI-resistant cell lines, siRNA knockdown, ER stress markers (PERK, ATF4), SERCA2b functional assays, ERα expression analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic link established with multiple pathway markers; single lab\",\n      \"pmids\": [\"28174265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Endogenous SGK3 is rapidly activated by IGF1 through pathways involving both Class 1 and Class 3 PI3Ks: IGF1 enhances endosomal PtdIns(3)P via the UV-RAG/hVPS34 complex; Class 1 PI3K stimulates SGK3 through enhanced PtdIns(3)P production from dephosphorylation of PtdIns(3,4,5)P3 and through mTORC2-mediated phosphorylation of SGK3. Oncogenic Ras activates SGK3 solely through the Class 1 PI3K pathway.\",\n      \"method\": \"Endogenous SGK3 activation assays, selective Vps34 inhibitors, mTORC2 inhibitors/siRNA, PI3K inhibitors, phospho-SGK3 immunoblotting, PtdIns(3)P probes\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological and genetic dissection of multiple upstream pathways; multiple inhibitor combinations with clear mechanistic conclusions\",\n      \"pmids\": [\"29150437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SGK3 mediates rapamycin resistance in breast cancer by reactivating the mTORC1/4EBP1 axis: rapamycin activates SGK3 in a hVps34- and mTORC2-dependent manner, and SGK3 phosphorylates TSC2 to reactivate mTORC1, restoring 4EBP1 phosphorylation and cap-dependent translation. SGK3 deletion combined with Akt inhibition almost completely blocks 4EBP1 re-phosphorylation and suppresses growth in vivo.\",\n      \"method\": \"SGK3 CRISPR knockout, phosphoproteomics, xenograft, TSC2 phosphorylation assay, cap-dependent translation assay\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO plus in vivo validation plus biochemical substrate identification\",\n      \"pmids\": [\"31182914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SGK3-PROTAC1, a PROTAC conjugate of an SGK inhibitor with a VHL ligand, selectively degrades SGK3 (not SGK1 or SGK2) within 2–8 h at 0.3 μM. Proteomic analysis shows SGK3 is the only cellular protein significantly reduced. SGK3 degradation suppresses phosphorylation of the SGK3 substrate NDRG1 and restores sensitivity of SGK3-dependent breast cancer cells to Akt and PI3K inhibitors, more effectively than conventional inhibition alone.\",\n      \"method\": \"PROTAC synthesis, quantitative proteomics, phospho-NDRG1 Western blotting, cell proliferation assays\",\n      \"journal\": \"ACS chemical biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — chemical degrader with proteome-wide selectivity profiling and functional validation; NDRG1 confirmed as SGK3 substrate\",\n      \"pmids\": [\"31461270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Phosphoproteomic screens identified 40 novel SGK3 substrates including four endosomal proteins: STX7 (Ser126), STX12 (Ser139), RFIP4 (Ser527), and WDR44 (Ser346), which are efficiently phosphorylated in vitro by SGK3 but poorly by Akt due to an unfavorable n+1 residue. SGK3 phosphorylation of STX12 enhances its interaction with the VAMP4/VTI1A/STX6 SNARE complex and promotes STX12 plasma membrane localization.\",\n      \"method\": \"Quantitative phosphoproteomics, in vitro kinase assays, Phos-tag gel analysis, SGK3 CRISPR knockout, Co-immunoprecipitation, subcellular fractionation\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — phosphoproteomics plus in vitro validation plus KO confirmation plus SNARE complex interaction; rigorous mechanistic study\",\n      \"pmids\": [\"31665227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PDPK1 (PDK1) mediates prostate cancer cell survival predominantly via SGK3 rather than Akt or SGK1: PDK1 knockdown significantly reduces SGK3 phosphorylation, and constitutively active SGK3 completely abrogates PDK1-knockdown-induced apoptosis, while constitutively active Akt does not, placing SGK3 as the primary survival effector of PDK1 in these cells.\",\n      \"method\": \"shRNA kinome library screen, siRNA, constitutively active SGK3/Akt rescue assays, PDK1 inhibitors, cell viability assays\",\n      \"journal\": \"Journal of cellular and molecular medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with rescue experiment clearly placing SGK3 downstream of PDK1\",\n      \"pmids\": [\"32926495\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A mutation in SGK3 (c.979-96 T>A) causes exon 13 skipping and in-frame deletion of 29 amino acids including Thr-320 (the PDK1 phosphorylation site required for activation), leading to autosomal dominant hypophosphatemic rickets. Protein structural modeling predicts significant structural change in the kinase domain, establishing SGK3 as a regulator of renal phosphate transport.\",\n      \"method\": \"Exome sequencing, co-segregation analysis, RT-PCR splice assay, protein structure modeling\",\n      \"journal\": \"The Journal of clinical endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — human genetics with splice/structural validation; no direct functional reconstitution but mechanistically informative\",\n      \"pmids\": [\"31821448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In vitro reconstitution of SGK3 activation demonstrates that PtdIns(3)P binding to the PX domain induces large conformational changes in SGK3 that promote kinase activation, as revealed by hydrogen-deuterium exchange mass spectrometry. The PI3P-binding pocket of the PX domain is sequestered in the inactive conformation. SGK3 is regulated by a combination of phosphorylation and allosteric activation, and Vps34-mediated PtdIns(3)P synthesis on liposomes reconstitutes SGK3 activation in vitro.\",\n      \"method\": \"HDX-MS, in vitro reconstitution with liposomes + Vps34, biochemical activity assays, biophysics (SPR, ITC)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with structural/biophysical validation (HDX-MS) revealing allosteric activation mechanism\",\n      \"pmids\": [\"34181950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SGK3 promotes vascular calcification in CKD by enhancing expression and activity of the sodium-dependent phosphate cotransporter Pit-1: SGK3 activates Pit-1 mRNA transcription via NF-κB, inhibits Nedd4-2-mediated Pit-1 ubiquitination/degradation, and directly phosphorylates Pit-1 at Thr468 (confirmed by co-immunoprecipitation and in vitro kinase assay) to enhance phosphate uptake independently of increased Pit-1 protein.\",\n      \"method\": \"Sgk3 knockdown in VSMCs, uremic mouse model (AVF/aorta), Co-IP, in vitro kinase assay, ubiquitination assay, NF-κB reporter\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase assay plus Co-IP plus in vivo model plus mechanistic NF-κB/Nedd4-2 dissection\",\n      \"pmids\": [\"38169564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CDK9 directly binds and activates SGK3, as identified by quantitative phosphoproteomics and pulldown assay, confirmed by co-immunoprecipitation. CDK9 promotes cardiac repair after myocardial infarction by directly activating SGK3 and the downstream GSK-3β/β-catenin pathway to stimulate cardiomyocyte cell cycle re-entry.\",\n      \"method\": \"Quantitative phosphoproteomics, pulldown assay, Co-IP, CDK9 overexpression/knockdown in cardiomyocytes, neonatal mouse apical resection/MI models\",\n      \"journal\": \"Frontiers in cardiovascular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP plus in vivo cardiac model; CDK9→SGK3 direct activation not yet confirmed by in vitro kinase assay\",\n      \"pmids\": [\"36082129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SGK3 functions as an antioxidant factor in cervical cancer cells harboring PIK3CA helical domain mutations: SGK3 is activated by oxidative stress, interacts with and phosphorylates catalase to promote its tetrameric state and enzymatic activity, and phosphorylates GSK3β to protect catalase from GSK3β/β-TrCP-mediated ubiquitination and proteasomal degradation. SGK3 inhibition potentiates CDK4/6 inhibitor cytotoxicity and overcomes cisplatin resistance through ROS-mediated mechanisms.\",\n      \"method\": \"Co-IP, in vitro kinase assay, ubiquitination assay, native PAGE (tetramer analysis), ROS measurement, drug combination assays\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro kinase assay plus Co-IP plus ubiquitination dissection plus native PAGE structural analysis; multiple orthogonal approaches\",\n      \"pmids\": [\"37866161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SGK3 deficiency in macrophages attenuates angiotensin II-induced cardiac remodeling. Mechanistically, SGK3 absence reduces IL-1β secretion by inhibiting the NLRP3/Caspase-1/IL-1β pathway in macrophages, which consequently suppresses Ndufa13 expression and mitochondrial oxidative stress in cardiomyocytes and fibroblasts. Macrophage-specific SGK3 conditional knockout (Lyz2-CRE) was used to establish macrophage-autonomous effects.\",\n      \"method\": \"Macrophage-specific SGK3 conditional KO (Lyz2-CRE), Ang II infusion cardiac model, RNA sequencing, NLRP3 inflammasome assays, co-culture system\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with mechanistic dissection via RNA-seq and inflammasome assays; single lab\",\n      \"pmids\": [\"39158709\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SGK3 promotes β-catenin accumulation and ER+ breast cancer proliferation through a STAT3/ZMIZ2 axis: SGK3 activates STAT3, leading to ZMIZ2 transcription; ZMIZ2 binds and stabilizes β-catenin; SGK3 knockdown causes β-catenin polyubiquitination/degradation that is reversed by ZMIZ2 overexpression. Identified by proteomics as an SGK3 downstream target.\",\n      \"method\": \"Quantitative proteomics, ChIP (p-STAT3 at ZMIZ2 promoter), Co-IP (ZMIZ2-β-catenin), siRNA/overexpression, tissue microarray immunofluorescence\",\n      \"journal\": \"British journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — proteomics-driven discovery plus ChIP and Co-IP validation; single lab\",\n      \"pmids\": [\"39876548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SGK3 promotes breast cancer stemness and alpelisib resistance by activating the GSK3β/β-catenin signaling pathway; SGK3 is upregulated in alpelisib-resistant cells, and its inhibition restores sensitivity to alpelisib.\",\n      \"method\": \"Alpelisib-resistant cell model, Western blotting for GSK3β/β-catenin pathway, spheroid/tumor formation assays, SGK3 inhibitor treatment\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, no direct phosphorylation evidence; mechanistic pathway placement via inhibitors/KD only\",\n      \"pmids\": [\"40303291\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SGK3 is required for TLR7 signaling in plasmacytoid dendritic cells: VPS34-IN1-mediated blockade of SGK3 endosomal recruitment prevents TLR7-dependent type-I IFN induction, identifying endosomal SGK3 as necessary for innate immune TLR7 signal transduction.\",\n      \"method\": \"VPS34-IN1 pharmacological inhibition, SGK3 localization assays, TLR7 stimulation, type-I IFN ELISA/reporter in human pDCs\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — pharmacological inhibitor (not SGK3-selective), preprint, single lab\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"SGK3 is a PI3K-dependent AGC serine/threonine kinase that is recruited and allosterically activated at endosomes through PtdIns(3)P binding to its N-terminal PX domain, whereupon PDK1 phosphorylates Thr-320 and mTORC2 phosphorylates Ser-486 in the hydrophobic motif; PtdIns(3)P is supplied by two routes—Vps34-mediated direct synthesis at endosomes and dephosphorylation of the class I PI3K product PtdIns(3,4,5)P3 via SHIP1/2 and INPP4B; once active, SGK3 phosphorylates substrates including TSC2 (activating mTORC1), NDRG1 (targeting it for Fbw7-mediated degradation), Nedd4-2 (increasing surface abundance of ENaC, SGLT1, hERG, and other channels/transporters), AIP4 (inhibiting CXCR4 lysosomal sorting), catalase (promoting its tetrameric active state and preventing GSK3β/β-TrCP-mediated degradation), Pit-1 (enhancing phosphate uptake), STX7 and STX12 (regulating endosomal SNARE complex assembly), and GSK-3β (activating β-catenin/Wnt signaling); SGK3 acts as a key Akt-independent effector of oncogenic PI3K signaling and mediates resistance to class I PI3K and Akt inhibitors by substituting for lost Akt activity to maintain mTORC1 and proliferative signaling.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SGK3 is a PX domain-containing serine/threonine kinase that functions as an endosome-localized effector of PI3K signaling, regulating mTORC1 activation, membrane trafficking, ion channel surface expression, β-catenin–dependent transcription, and redox homeostasis. SGK3 is recruited to endosomes by binding PtdIns(3)P—generated either by class III PI3K (Vps34) or by sequential dephosphorylation of class I PI3K products via INPP4B—which allosterically activates the kinase and enables T-loop phosphorylation by PDK1 and hydrophobic motif phosphorylation by mTORC2 [PMID:25177796, PMID:34181950, PMID:29150437]. Fully activated SGK3 phosphorylates substrates partially overlapping with Akt (TSC2, GSK-3β, Nedd4-2) and unique endosomal targets (STX7, STX12, Pit-1, catalase), thereby controlling mTORC1 signaling, SNARE complex assembly, transporter activity, and catalase stabilization [PMID:27481935, PMID:31665227, PMID:37866161, PMID:38169564]. SGK3 is upregulated under prolonged PI3K/Akt inhibition to bypass Akt and sustain proliferative signaling in breast cancer, and is required in vivo for hair follicle morphogenesis—where it cooperates with Akt2 to promote nuclear β-catenin accumulation—and for intestinal Na⁺-coupled glucose absorption [PMID:27481935, PMID:15240817, PMID:19433625, PMID:15971077].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of SGK3 as a kinase that directly phosphorylates GSK-3β at Ser9 established its first known substrate and linked it to the Wnt/β-catenin regulatory axis.\",\n      \"evidence\": \"Yeast two-hybrid screen, co-immunoprecipitation, and in vitro kinase assay in HEK293 cells\",\n      \"pmids\": [\"12054501\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; no in vivo validation of SGK3→GSK-3β at this time\", \"Physiological context of this phosphorylation event undefined\", \"No comparison with Akt-mediated GSK-3β phosphorylation\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"SGK3 knockout mice revealed that SGK3 is essential for postnatal hair follicle morphogenesis via β-catenin/Lef-1–dependent transcription, providing the first organismal phenotype and linking kinase activity to a developmental process.\",\n      \"evidence\": \"Sgk3-null mice with BrdU proliferation, β-catenin immunostaining, and luciferase reporter assays in keratinocytes\",\n      \"pmids\": [\"15240817\", \"15166308\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct SGK3 substrate mediating nuclear β-catenin accumulation not identified\", \"Relative contribution of GSK-3β phosphorylation vs. other mechanisms unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstration that SGK3 regulates ENaC and SGLT1 indirectly through Nedd4-2 phosphorylation established a general mechanism for SGK3-mediated control of ion channel and transporter surface expression.\",\n      \"evidence\": \"Xenopus oocyte electrophysiology with ENaC/SGLT1, SGK3 active/inactive mutants, Nedd4-2 phosphorylation site mutagenesis\",\n      \"pmids\": [\"12632189\", \"15166308\", \"15971077\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nedd4-2 phosphorylation sites targeted by SGK3 versus SGK1 not fully distinguished\", \"Mechanism is largely shown in heterologous oocyte system\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"SGK3-null mice showed reduced intestinal Na⁺-coupled glucose transport (SGLT1), establishing an in vivo role for SGK3 in nutrient absorption and extending the Nedd4-2 regulatory paradigm to native tissue.\",\n      \"evidence\": \"Sgk3-null mice, Ussing chamber electrophysiology on intestinal epithelium, plasma glucose measurements\",\n      \"pmids\": [\"15971077\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SGK3 acts on SGLT1 via Nedd4-2 in vivo not directly tested\", \"Potential compensatory changes in SGK1 not assessed\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"SGK1/SGK3 double-knockout mice and the YPC nonsense mutant allele demonstrated functional redundancy among SGK isoforms in renal salt handling and confirmed that the hydrophobic motif (Ser486) phosphorylation is essential for SGK3 activity in vivo.\",\n      \"evidence\": \"SGK1/SGK3 double-KO mice with electrolyte/blood pressure measurements; YPC allelic series with genetic mapping and in situ hybridization\",\n      \"pmids\": [\"16537821\", \"16565488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct renal substrates of SGK3 beyond Nedd4-2 not identified\", \"Cell-type-specific contributions in kidney not resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Akt2/SGK3 double-knockout mice showed synergistic hair follicle and later β-cell defects, establishing that SGK3 and Akt2 redundantly regulate β-catenin–dependent transcription in multiple tissues.\",\n      \"evidence\": \"Double-KO mice with nuclear β-catenin immunostaining, proliferation assays, β-catenin-LEF1 reporter in keratinocytes; β-cell mass and GSIS in DKO\",\n      \"pmids\": [\"19433625\", \"21980074\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SGK3 directly phosphorylates a β-catenin destruction complex component other than GSK-3β unknown\", \"Contribution of Akt2 vs. SGK3 to β-catenin stability not quantitatively resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"SGK3 was shown to increase hERG channel surface expression through two complementary mechanisms—Nedd4-2 inhibition and Rab11-dependent recycling—revealing a dual trafficking role beyond simple Nedd4-2 regulation.\",\n      \"evidence\": \"HEK293 overexpression, Rab11 dominant-negative, Nedd4-2 binding-site mutations, surface biotinylation, and patch clamp\",\n      \"pmids\": [\"23589291\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct phosphorylation target linking SGK3 to Rab11 recycling not identified\", \"Endogenous relevance in cardiomyocytes not demonstrated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Two convergent studies established how PtdIns(3)P controls SGK3 activation: one pool generated by Vps34 and a second derived from class I PI3K products via INPP4B dephosphorylation, with PX domain binding to PtdIns(3)P required for both PDK1 T-loop and mTORC2 hydrophobic motif phosphorylation. In parallel, INPP4B-dependent SGK3 activation was shown to drive NDRG1 degradation in breast cancer.\",\n      \"evidence\": \"Selective Vps34 inhibitor, class I PI3K inhibitors, PX domain mutants, in-cell phosphorylation; INPP4B overexpression/KD with NDRG1/Fbw7 analysis and xenograft\",\n      \"pmids\": [\"25177796\", \"25458846\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of PX domain PtdIns(3)P recognition not yet resolved at atomic level\", \"Whether INPP4B-SGK3 axis operates outside breast cancer not tested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"SGK3 was identified as a critical bypass mechanism for Akt inhibition in breast cancer: prolonged PI3K/Akt blockade upregulates SGK3, which phosphorylates TSC2 to reactivate mTORC1, explaining resistance to PI3K-pathway–targeted therapies.\",\n      \"evidence\": \"SGK3 KD/overexpression, VPS34 inhibitor, TSC2 phosphorylation assays, xenograft tumor growth\",\n      \"pmids\": [\"27481935\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of SGK3 transcriptional upregulation during Akt inhibition not fully characterized\", \"Whether SGK3 directly phosphorylates TSC2 at the same sites as Akt not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The upstream pathway was fully dissected: IGF1 activates SGK3 through both class I PI3K (via PtdIns(3)P conversion) and class III PI3K (via UVRAG complex), while oncogenic Ras engages only the class I route, defining two convergent lipid-signaling inputs.\",\n      \"evidence\": \"Pharmacological inhibitors of class I/III PI3K, mTORC2 inhibitors, dominant-negative constructs, phospho-SGK3 immunoblotting\",\n      \"pmids\": [\"29150437\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether additional growth factors engage the class III route independently not tested\", \"Quantitative contribution of each PtdIns(3)P pool to total SGK3 activation unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Phosphoproteomic screens identified SGK3-specific endosomal substrates (STX7, STX12, RFIP4, WDR44) that are poorly phosphorylated by Akt due to an unfavorable n+1 residue, establishing the molecular basis for substrate selectivity and linking SGK3 to SNARE-mediated membrane trafficking.\",\n      \"evidence\": \"Genetic/pharmacological phosphoproteomics in SGK3-KO cells, in vitro kinase assays, Phos-tag, co-IP of STX12–VAMP4/VTI1A/STX6 complex\",\n      \"pmids\": [\"31665227\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of STX7 Ser126 phosphorylation not determined\", \"Whether RFIP4 and WDR44 phosphorylation alter specific trafficking routes not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Development of SGK3-PROTAC1, an isoform-selective degrader, provided a pharmacological tool confirming that acute SGK3 depletion reduces NDRG1 phosphorylation and restores sensitivity to Akt/PI3K inhibitors, validating SGK3 as a therapeutic target.\",\n      \"evidence\": \"PROTAC degrader with VHL ligand, quantitative proteomics showing selectivity over SGK1/SGK2, NDRG1 phospho-immunoblotting, proliferation assays\",\n      \"pmids\": [\"31461270\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo pharmacokinetics and efficacy of SGK3-PROTAC1 not reported\", \"Whether complete SGK3 degradation produces toxicity not assessed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"HDX-MS and in vitro reconstitution revealed the allosteric activation mechanism: PtdIns(3)P binding to the PX domain triggers large conformational changes that expose the kinase domain, and the PtdIns(3)P-binding pocket is sequestered in the inactive conformation.\",\n      \"evidence\": \"Hydrogen-deuterium exchange MS, reconstitution with Vps34-generated PtdIns(3)P on liposomes\",\n      \"pmids\": [\"34181950\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"High-resolution crystal or cryo-EM structure of full-length SGK3 in active versus inactive state not available\", \"Whether additional membrane components modulate the conformational switch not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"SGK3 was shown to function as a redox regulator by phosphorylating catalase to promote its tetramerization and enzymatic activity, while simultaneously phosphorylating GSK-3β to protect catalase from β-TrCP–mediated ubiquitination, linking SGK3 to antioxidant defense.\",\n      \"evidence\": \"In vitro kinase assay, co-IP, ubiquitination assays, catalase activity and ROS measurements, SGK3 inhibition rescue\",\n      \"pmids\": [\"37866161\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific catalase phosphorylation site not mapped\", \"In vivo significance of SGK3-catalase axis in oxidative stress conditions not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"SGK3 was identified as a driver of vascular calcification in CKD through a triple mechanism on the phosphate transporter Pit-1: transcriptional upregulation via NF-κB, stabilization via Nedd4-2 inhibition, and direct phosphorylation at Thr468 to enhance phosphate uptake.\",\n      \"evidence\": \"In vitro kinase assay, co-IP, siRNA KD, uremic mouse model, calcium deposition assay, NF-κB reporter\",\n      \"pmids\": [\"38169564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SGK3 directly activates NF-κB or acts through an intermediate not resolved\", \"Therapeutic targeting of SGK3 to prevent vascular calcification not tested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of full-length SGK3 in both active and inactive states, the complete inventory of SGK3-specific endosomal substrates and their trafficking consequences, and the in vivo therapeutic potential of SGK3 inhibition/degradation in PI3K-resistant cancers remain to be established.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No atomic-resolution structure of full-length SGK3\", \"Functional consequences of most phosphoproteomic substrates unexplored\", \"In vivo efficacy of SGK3-selective degraders untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [5, 6, 7, 8, 18, 24, 28]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 17, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 3, 4, 17, 20]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [7, 21, 22, 24, 27]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [5, 8]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [9, 10, 11]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"GSK3B\",\n      \"NEDD4L\",\n      \"STX12\",\n      \"STX7\",\n      \"PDK1\",\n      \"TSC2\",\n      \"NDRG1\",\n      \"CAT\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"SGK3 is a PI3K-dependent AGC family serine/threonine kinase that is uniquely recruited to endosomes via PtdIns(3)P binding to its N-terminal PX domain, where it undergoes allosteric activation and sequential phosphorylation by PDK1 (Thr-320) and mTORC2 (Ser-486) [PMID:10548550, PMID:16790420, PMID:34181950]. PtdIns(3)P is supplied by Vps34-mediated synthesis at endosomes and by sequential dephosphorylation of PtdIns(3,4,5)P3 via SHIP1/2 and INPP4B, enabling SGK3 to function as a critical Akt-independent effector of oncogenic PI3K signaling that phosphorylates TSC2 to reactivate mTORC1, NDRG1 to promote its Fbw7-mediated degradation, Nedd4-2 to increase surface abundance of ion channels and transporters (ENaC, hERG, SGLT1), AIP4 to inhibit CXCR4 lysosomal sorting, and endosomal SNAREs (STX7, STX12) to regulate vesicle fusion [PMID:25177796, PMID:27481935, PMID:25458846, PMID:16888620, PMID:31665227]. SGK3 cooperates with Akt2 in β-catenin–dependent hair follicle morphogenesis and pancreatic β-cell function, and its transcriptional upregulation by ERα and AR in hormone-dependent cancers drives resistance to PI3K, Akt, and aromatase inhibitors [PMID:15240817, PMID:21980074, PMID:21084382, PMID:31182914]. A loss-of-function splice mutation eliminating the PDK1 phosphorylation site causes autosomal dominant hypophosphatemic rickets, establishing SGK3 as essential for renal phosphate homeostasis [PMID:31821448].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Identification of SGK3 as a novel PDK1-activated AGC kinase isoform established that the SGK family contains three members with distinct regulation—unlike SGK1, SGK3 is not serum- or glucocorticoid-inducible.\",\n      \"evidence\": \"Molecular cloning, in vitro kinase reconstitution with PDK1, site-directed mutagenesis, Northern blotting across human tissues\",\n      \"pmids\": [\"10548550\", \"10585774\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No endogenous substrate identified\", \"No information on upstream lipid signals governing activation\", \"Tissue-specific functions unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Discovery that the PX domain binds phosphoinositides and is required for endosomal targeting and kinase activity resolved the question of how SGK3 is spatially regulated and distinguished it from SGK1/SGK2.\",\n      \"evidence\": \"Lipid-binding assays, confocal live-cell imaging, PX domain mutagenesis ablating both localization and activity\",\n      \"pmids\": [\"11514587\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphoinositide species driving endosomal activation not determined\", \"Structural basis of PX-phosphoinositide interaction unknown\", \"Identity of the kinase phosphorylating the hydrophobic motif unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Sgk3 knockout mice revealed an essential in vivo role in β-catenin–dependent hair follicle morphogenesis, providing the first genetic loss-of-function phenotype and linking SGK3 to Wnt/β-catenin signaling.\",\n      \"evidence\": \"Gene-targeted KO mice with histology, BrdU proliferation, β-catenin immunostaining, Lef-1 reporter in keratinocytes\",\n      \"pmids\": [\"15240817\", \"16103225\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct SGK3 substrate mediating β-catenin nuclear accumulation not identified\", \"Whether SGK3 phosphorylates GSK-3β in vivo to stabilize β-catenin not confirmed\", \"Redundancy with Akt isoforms not yet tested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstration that SGK3 stimulates ENaC, SGLT1, and other channels/transporters via Nedd4-2 phosphorylation established a general mechanism by which SGK3 increases surface transporter abundance through E3 ligase inhibition.\",\n      \"evidence\": \"Xenopus oocyte electrophysiology with constitutively active/inactive SGK3 mutants, Nedd4-2 phosphosite mutagenesis\",\n      \"pmids\": [\"12632189\", \"15166308\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"All transporter studies performed in Xenopus oocytes, not mammalian cells\", \"Relative contribution of Nedd4-2 versus other trafficking mechanisms unclear\", \"In vivo relevance for most channels not established\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mechanistic dissection showed that PX domain-mediated endosomal recruitment is a prerequisite for PDK1 phosphorylation of Thr-320, and that artificially diverting SGK3 to the plasma membrane disrupts activation—demonstrating that SGK3 activation is spatially restricted to endosomes.\",\n      \"evidence\": \"Subcellular fractionation, phospho-specific antibodies, domain-swap chimeras, in vitro PDK1 kinase assay\",\n      \"pmids\": [\"16790420\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the hydrophobic motif kinase still unresolved at this point\", \"Structure of the PX-kinase domain interface unknown\", \"How PDK1 accesses endosomal SGK3 not determined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"SGK3 was shown to inhibit CXCR4 lysosomal sorting by phosphorylating the E3 ligase AIP4 at endosomes, providing the first direct evidence that endosomal SGK3 regulates receptor trafficking and degradation.\",\n      \"evidence\": \"Co-IP, confocal colocalization, in vitro kinase assay identifying AIP4 phosphosites, siRNA knockdown, CXCR4 degradation assay\",\n      \"pmids\": [\"16888620\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"AIP4 phosphosites not mapped to specific residues in this study\", \"Whether SGK3 regulates trafficking of other GPCRs unknown\", \"In vivo significance of CXCR4 stabilization not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Akt2/SGK3 double-knockout mice demonstrated functional redundancy between the two kinases in hair follicle β-catenin signaling, establishing that AGC kinases cooperate to maintain Wnt pathway output in vivo.\",\n      \"evidence\": \"Double-KO mouse genetics with β-catenin immunostaining, BrdU labeling, Lef-1 reporter\",\n      \"pmids\": [\"19433625\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the redundancy extends to other tissues remains untested\", \"Direct shared substrates mediating β-catenin stabilization not identified\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Use of a selective Vps34 inhibitor (VPS34-IN1) proved that Vps34-generated PtdIns(3)P is the primary endosomal lipid activating SGK3, while a second PtdIns(3)P pool derived from class I PI3K product dephosphorylation (via SHIP1/2, INPP4B) also contributes, resolving the upstream lipid input question.\",\n      \"evidence\": \"VPS34-IN1 inducing rapid SGK3 dephosphorylation, class I PI3K inhibitors causing partial SGK3 loss, PX domain mutant epistasis\",\n      \"pmids\": [\"25177796\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative flux through each PtdIns(3)P-generating pathway not quantified\", \"Cell-type variation in pathway dependency unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"SGK3 was identified as an amplified oncogene in breast cancer activated via INPP4B-dependent, Akt-independent PI3K signaling; it promotes tumorigenesis by phosphorylating NDRG1 for Fbw7-mediated degradation, establishing SGK3 as a driver of PI3K oncogenic signaling that can bypass Akt.\",\n      \"evidence\": \"Genomic copy-number analysis, siRNA, 3D Matrigel, xenograft, NDRG1 ubiquitination and degradation assays\",\n      \"pmids\": [\"25458846\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NDRG1 phosphorylation is sufficient for tumor-promoting effects not determined\", \"Patient stratification biomarkers for SGK3-driven tumors not developed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"The critical question of how cancer cells resist PI3K/Akt inhibitors was answered by showing that prolonged inhibition upregulates SGK3, which phosphorylates TSC2 to reactivate mTORC1 independently of Akt, providing the mechanistic basis for drug resistance.\",\n      \"evidence\": \"Prolonged PI3K/Akt inhibitor treatment, phospho-SGK3/TSC2/S6K Western blotting, siRNA epistasis, BT-474 xenograft with dual SGK+Akt inhibitor\",\n      \"pmids\": [\"27481935\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific TSC2 phosphosite(s) targeted by SGK3 not fully mapped\", \"Clinical validation of combined SGK3+Akt inhibition not yet performed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Phosphoproteomics identified endosomal SNAREs (STX7, STX12) as SGK3-specific substrates poorly phosphorylated by Akt, revealing that SGK3 directly regulates endosomal membrane fusion and explaining its unique endosomal function.\",\n      \"evidence\": \"Quantitative phosphoproteomics, in vitro kinase assays with substrate specificity comparison, SGK3 CRISPR KO, Co-IP of STX12/SNARE complex\",\n      \"pmids\": [\"31665227\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of STX7 phosphorylation on trafficking not characterized\", \"Whether SNARE phosphorylation contributes to SGK3 oncogenic functions unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"A human SGK3 splice mutation eliminating the PDK1 phosphorylation site was shown to cause autosomal dominant hypophosphatemic rickets, establishing SGK3 as essential for renal phosphate handling and providing the first Mendelian disease link.\",\n      \"evidence\": \"Exome sequencing with family co-segregation, RT-PCR splice assay confirming exon 13 skipping and loss of Thr-320\",\n      \"pmids\": [\"31821448\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional reconstitution (e.g., kinase activity of mutant protein, rescue in cells)\", \"Mechanism linking SGK3 to phosphate reabsorption not yet identified at molecular level\", \"Single family reported\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"In vitro reconstitution with HDX-MS revealed the allosteric mechanism of SGK3 activation: PtdIns(3)P binding to the PX domain induces large conformational changes that expose the activation loop, explaining why membrane recruitment and phosphorylation are obligatorily coupled.\",\n      \"evidence\": \"HDX-MS structural analysis, liposome reconstitution with Vps34, SPR/ITC biophysics\",\n      \"pmids\": [\"34181950\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution crystal or cryo-EM structure of full-length SGK3 available\", \"Conformational dynamics during substrate engagement not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"SGK3 was shown to function as an antioxidant regulator by directly phosphorylating catalase to promote its tetrameric active state and by phosphorylating GSK-3β to prevent β-TrCP-mediated catalase degradation, linking SGK3 to redox homeostasis and chemoresistance.\",\n      \"evidence\": \"In vitro kinase assay, Co-IP, native PAGE for catalase tetramer, ubiquitination assay, ROS measurement, drug combination assays in PIK3CA-mutant cervical cancer cells\",\n      \"pmids\": [\"37866161\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Catalase phosphosite(s) not mapped\", \"In vivo relevance of SGK3-catalase axis not tested\", \"Generalizability beyond PIK3CA-mutant cervical cancer unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the high-resolution structure of full-length SGK3, whether SGK3 endosomal SNARE phosphorylation contributes to its oncogenic functions, clinical validation of combined SGK3/Akt/PI3K inhibitor strategies, and the molecular mechanism by which SGK3 loss causes hypophosphatemic rickets.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length SGK3 atomic structure\", \"Clinical-grade selective SGK3 inhibitor not yet available\", \"Mechanism of SGK3-dependent renal phosphate reabsorption uncharacterized\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 3, 5, 14, 33, 37, 39]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [2, 22, 36]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [2, 12, 14, 22, 33, 36]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 12, 22, 27, 30]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [23, 27, 31, 32, 39, 42]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [14, 33]},\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [5, 8, 37]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 9, 17]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"PDPK1\",\n      \"NEDD4L\",\n      \"AIP4\",\n      \"GSK3B\",\n      \"TSC2\",\n      \"NDRG1\",\n      \"STX12\",\n      \"STX7\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}