{"gene":"RPS6KB1","run_date":"2026-06-10T07:46:27","timeline":{"discoveries":[{"year":1996,"finding":"The principal rapamycin-sensitive phosphorylation sites on p70(S6K) are T-389 (in the linker/hydrophobic motif region) and T-229 (in the activation loop). T-389 is the principal regulatory site whose phosphorylation, together with hyperphosphorylation of the carboxyl-terminal autoinhibitory domain S/TP sites, controls T-229 phosphorylation through an intrasteric mechanism. Mutation of T-389 to an acidic residue confers resistance to rapamycin, wortmannin, and SQ20006, while T-229 phosphorylation is regulated by internal mechanisms and is differentially sensitive to inhibitors.","method":"Truncation and point mutants of p70(S6K), phosphorylation site mapping, kinase activity assays with inhibitors (rapamycin, wortmannin, SQ20006)","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — systematic mutagenesis of activation loop and hydrophobic motif sites combined with kinase assays, multiple mutant combinations tested with multiple inhibitors","pmids":["8887654"],"is_preprint":false},{"year":1998,"finding":"Phosphorylation of the carboxyl-terminal autoinhibitory domain S/TP sites mimics the effect of carboxyl-terminal deletion and rescues kinase activation caused by amino-terminal truncation. Phosphorylation of T-389 in cooperation with the S/TP site phosphorylations controls T-229 (activation loop) phosphorylation through an intrasteric mechanism. A mutant harboring acidic substitutions at both S/TP sites and T-389 is an excellent in vitro substrate for PDK1 (the T-229 kinase), whereas single-substitution variants are poor PDK1 substrates.","method":"Point mutagenesis of p70(S6K) S/TP autoinhibitory sites to acidic residues, in vitro PDK1 phosphorylation assays, kinase activity measurements","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro phosphorylation by PDK1, systematic mutagenesis of multiple regulatory sites with functional validation","pmids":["9614086"],"is_preprint":false},{"year":2001,"finding":"PDK1 activates S6K1 at the T-loop (T229) via interaction with the PIF-binding pocket in PDK1's kinase domain. Prior phosphorylation of S6K1 at its hydrophobic motif (T389) promotes interaction with the PIF-binding pocket of PDK1 and subsequent T-loop phosphorylation. This pocket is required for S6K1 and SGK1 activation but not for PKB/Akt phosphorylation by PDK1.","method":"PIF-binding pocket mutants of PDK1, in vitro kinase assays, co-immunoprecipitation, functional activation studies with S6K1, SGK1, and PKB","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro phosphorylation, mutagenesis of PDK1 pocket, multiple substrates compared in same study","pmids":["11500365"],"is_preprint":false},{"year":1998,"finding":"Genetic disruption of the p70(S6K)/p85(S6K) gene in mice results in a small growth phenotype (particularly during embryogenesis) but not lethality or infertility. Despite loss of p70/p85-S6K, S6 phosphorylation and 5'TOP mRNA translational up-regulation proceed normally in response to mitogens and remain rapamycin-sensitive, due to compensatory up-regulation of a novel homolog S6K2.","method":"Gene knockout in mice, polysome profiling, S6 phosphorylation Western blot, rapamycin sensitivity assays in mouse embryo fibroblasts","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout mouse with defined phenotypic readouts, multiple orthogonal assays (S6 phosphorylation, 5'TOP mRNA translation, rapamycin sensitivity)","pmids":["9822608"],"is_preprint":false},{"year":1998,"finding":"Targeted disruption of p70(S6K) in murine embryonic stem cells eliminates ribosomal S6 phosphorylation and abolishes serum-induced translational up-regulation of ribosomal protein mRNAs (5'TOP mRNAs), establishing that p70(S6K) specifically controls ribosomal biogenesis by regulating ribosomal protein synthesis at the level of mRNA translation. Rapamycin inhibition of 4E-BP1 phosphorylation, general mRNA translation, and overall protein synthesis proceeds independently of p70(S6K).","method":"Gene targeting in ES cells, ribosomal S6 phosphorylation assay, selective mRNA translation assays, rapamycin treatment","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with specific molecular phenotype (S6 phosphorylation loss, 5'TOP translation defect) and dissection from 4E-BP1/general translation pathway","pmids":["9560223"],"is_preprint":false},{"year":1999,"finding":"p70(S6K) activity is high in resting Xenopus oocytes and decreases upon progesterone-induced maturation, with three peaks during embryogenesis. Rapamycin-sensitive p70(S6K) activity suppresses translation of non-5'TOP mRNAs (mos, Cdc25A) while promoting 5'TOP mRNA translation; a rapamycin-insensitive constitutively active p70(S6K) mutant reverses rapamycin effects on oocyte maturation timing.","method":"Xenopus oocyte injection of rapamycin-insensitive constitutively active p70(S6K) mutant, translation assays with 5'TOP and non-5'TOP reporter constructs, kinase activity measurements during development","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — rescue with constitutively active mutant, reporter translation assays, multiple developmental time points","pmids":["10082514"],"is_preprint":false},{"year":1999,"finding":"Amino acid-dependent activation of p70(S6K) requires mTOR and involves tRNA aminoacylation: amino acid alcohols (inhibitors of tRNA aminoacylation), cycloheximide/puromycin (which block use of aminoacylated tRNA), and a temperature-sensitive histidyl-tRNA synthetase mutant each suppress p70(S6K) activity, indicating that deacylated tRNA is a negative regulator of p70(S6K).","method":"Amino acid alcohol treatment, cycloheximide/puromycin treatment, temperature-sensitive tRNA synthetase mutant cells, rapamycin and wortmannin inhibition, mTOR rapamycin-resistant mutant (S2035I)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal genetic and pharmacological approaches converge on tRNA aminoacylation as upstream regulator; rapamycin-resistant mTOR mutant confirms mTOR requirement","pmids":["9873056"],"is_preprint":false},{"year":2004,"finding":"Constitutive activation of the Rheb/mTOR/S6K pathway (by TSC1 or TSC2 deletion or ectopic Rheb expression) induces insulin resistance through downregulation of IRS1 and IRS2, making Akt completely refractory to IRS-dependent growth factor activation (insulin/IGF-I) but not to IRS-independent pathways (PDGF). This establishes S6K-mediated negative feedback on IRS1/2 as the mechanism linking mTOR hyperactivation to insulin resistance.","method":"Genetic deletion of TSC1 or TSC2, ectopic Rheb expression, IRS1/2 Western blot, Akt phosphorylation assays, growth factor stimulation with insulin/IGF-I vs PDGF","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models (TSC1 KO, TSC2 KO, Rheb overexpression) with defined molecular mechanism (IRS1/2 downregulation) and functional validation (Akt activation)","pmids":["15380067"],"is_preprint":false},{"year":2010,"finding":"The Drosophila B' regulatory subunit of PP2A (PP2A-B') directly dephosphorylates S6K; PP2A-B' knockout flies exhibit elevated S6K phosphorylation. The human homolog PPP2R5C also counteracts S6K1 phosphorylation, indicating a conserved mechanism. PP2A-B' physically and genetically interacts with S6K.","method":"PP2A-B' knockout Drosophila, S6K phosphorylation Western blot, co-immunoprecipitation (physical interaction), genetic interaction studies, PPP2R5C knockdown in human cells","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout flies with defined phosphorylation phenotype, physical interaction, conserved mechanism validated in human cells with two orthogonal methods","pmids":["20444422"],"is_preprint":false},{"year":2018,"finding":"The mTOR-S6K pathway phosphorylates RNF168 at Ser60, inhibiting its E3 ubiquitin ligase activity, accelerating its proteolysis, and impairing DNA damage response (DDR). Loss of LKB1 hyperactivates mTORC1-S6K, decreases RNF168 expression, and causes DDR defects; a phospho-deficient RNF168-S60A mutant rescues DDR and suppresses tumorigenesis caused by Lkb1 loss.","method":"Phosphorylation site identification (Ser60 on RNF168), S6K kinase assay, RNF168 ubiquitin ligase activity assay, RNF168 stability/proteolysis assays, phospho-deficient mutant rescue in Lkb1-null cells/tumors","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct phosphorylation of substrate (RNF168-S60) by S6K established biochemically, mutant rescue in vivo, multiple orthogonal methods","pmids":["29403037"],"is_preprint":false},{"year":2016,"finding":"S6K1 physically interacts with the signaling adaptor STING in a cGAS-dependent manner upon DNA virus infection. The kinase domain (but not kinase activity) of S6K1 is required for the S6K1-STING interaction; TBK1 critically promotes formation of a tripartite S6K1-STING-TBK1 complex, which is necessary for IRF3 activation and antiviral gene expression.","method":"Co-immunoprecipitation, kinase-dead S6K1 mutants, cGAS-deficient cells, TBK1 inhibition/depletion, IRF3 activation assays, antiviral immune response assays in vivo","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, domain-mapping mutants, multiple genetic perturbations defining the tripartite complex, in vivo functional validation","pmids":["27043414"],"is_preprint":false},{"year":2004,"finding":"p70(S6K) associates with the F-actin cytoskeleton (cosedimentation and subcellular fractionation) and localizes with activated mTOR at the actin arc (a caveolin-enriched structure at the leading edge of migrating cells) along with Akt1, PDK1, and p85-PI3K. EGF-induced actin arc formation (a correlate of migration) is blocked by rapamycin. Stress fibers down-regulate p70(S6K) activity; disruption of stress fibers increases p70(S6K) activity, establishing a functional link between the actin cytoskeleton and p70(S6K) in cell migration.","method":"F-actin cosedimentation, subcellular fractionation, immunocytochemistry with phospho-specific mTOR antibody, rapamycin treatment, cytochalasin D and Rho kinase inhibitor treatment","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization to actin compartments with functional consequence (migration/actin arc formation blocked by rapamycin), single lab with multiple orthogonal methods","pmids":["15149849"],"is_preprint":false},{"year":2009,"finding":"S6K1 interferon-dependent phosphorylates eIF4B at Ser422, enhancing eIF4B interaction with eIF3A and increasing eIF3A-associated ATPase activity. IFN-inducible eIF4B activity and downstream protein expression (ISG15, CXCL-10) are diminished in S6k1/S6k2 double-knockout MEFs, establishing S6K1 as required for IFN-dependent mRNA translation.","method":"S6k1/S6k2 double-knockout MEFs, eIF4B Ser422 phosphorylation assay, eIF3A co-immunoprecipitation, ATPase activity assay, ISG15/CXCL-10 protein expression, eIF4B/eIF3A siRNA knockdown","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — double-KO MEFs with defined phenotype, in vitro phosphorylation, protein-protein interaction, ATPase functional assay — multiple orthogonal methods","pmids":["19289497"],"is_preprint":false},{"year":2004,"finding":"S6K1 specifically binds CoA synthase; the interaction involves the C-terminal regions of both proteins (mapped by in vivo co-immunoprecipitation and in vitro BIAcore analysis). CoA synthase is not a substrate for S6K1 and the interaction does not affect their enzymatic activities, but the association suggests a link between mTOR/S6K signaling and CoA biosynthesis/energy metabolism.","method":"Co-immunoprecipitation of native and transiently overexpressed proteins, BIAcore binding analysis, C-terminal domain mapping, in vitro kinase assay","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus in vitro BIAcore, domain mapping; functional consequence remains unclear","pmids":["15589845"],"is_preprint":false},{"year":2004,"finding":"PILSAP (a leucyl aminopeptidase) binds PDK1 and removes 9 amino acids from its N-terminus, which allows S6K to associate with the PDK1-PILSAP complex and become activated upon VEGF stimulation. Mutant PILSAP lacking aminopeptidase activity but retaining PDK1 binding acts as a dominant-negative inhibitor of S6K activation and angiogenesis in vivo.","method":"Co-immunoprecipitation, dominant-negative PILSAP mutant, N-terminal truncated PDK1 rescue, CDK4/6 activity and Rb phosphorylation assays, in vivo tumor angiogenesis model","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP demonstrating PDK1-S6K-PILSAP complex, dominant-negative rescue with truncated PDK1, multiple functional readouts, in vivo validation","pmids":["15187024"],"is_preprint":false},{"year":1999,"finding":"p70(S6K) phosphorylation (activity) in rat skeletal muscle 6 h after high-resistance exercise correlates (r=0.998) with long-term skeletal muscle hypertrophy after 6 weeks of training. Polysome profiles after high-resistance contractions indicate increased translational initiation rate, and p70(S6K) activity is elevated 3.5-fold in the EDL and TA muscles.","method":"Rat resistance exercise model, immune complex p70(S6K) kinase assay, polysome profiling, muscle mass measurement after training","journal":"The American journal of physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — correlative but direct measurement of kinase activity and polysome profiles in vivo; single lab, single method per readout","pmids":["9886927"],"is_preprint":false},{"year":1999,"finding":"H2O2 generated by glucose/glucose oxidase activates p70(S6K) in mouse epidermal cells (JB6) via a Ca2+-dependent mechanism acting upstream of PI3K and mTOR/FRAP. Growth factors (PDGF, EGF) induce p70(S6K) activation through H2O2 generation; catalase blocks both growth factor-induced H2O2 and p70(S6K) activation. TPA-responsive PKC is not required for ROS-induced p70(S6K) activation.","method":"Exogenous H2O2, glucose/glucose oxidase system, catalase treatment, rapamycin and wortmannin inhibition, Ca2+ chelation, PKC downregulation, immune complex kinase assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — multiple pharmacological inhibitors and scavengers, single lab; mechanistic pathway placement via inhibitor hierarchy","pmids":["10551813"],"is_preprint":false},{"year":2020,"finding":"During mitosis, mTORC1 activity is dramatically reduced, which prevents S6K-mediated phosphorylation and degradation of the tumor suppressor PDCD4. PDCD4 inhibits eIF4A activity; the mTORC1/S6K/PDCD4/eIF4A axis determines the outcome (death vs. slippage) during mitotic arrest. Expression of a non-phosphorylatable raptor mutant reactivates mTORC1 during mitosis, promotes PDCD4 degradation, and reduces Taxol cytotoxicity.","method":"Non-phosphorylatable raptor mutant expression, PDCD4 stability assays, eIF4A inhibition, Taxol sensitivity assays, cell death vs. slippage quantification","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — raptor phospho-mutant rescue, PDCD4 degradation assay, eIF4A pharmacological inhibition, multiple orthogonal readouts of mitotic outcome","pmids":["33027666"],"is_preprint":false},{"year":2001,"finding":"In Drosophila, dPDK1 controls cellular and organism growth by activating both dAkt and dS6K (ribosomal S6 kinase); dPDK1 genetically interacts with dRSK but not dPKN, indicating dPDK1 regulates insulin-mediated growth through two main branches: dAkt and dS6K.","method":"Drosophila genetic epistasis, dPDK1 loss-of-function and gain-of-function, dAkt and dS6K activity measurements, genetic interaction tests with dRSK and dPKN","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — Drosophila ortholog study with clean genetic epistasis, in vivo growth phenotypes, multiple kinase substrates tested","pmids":["11752451"],"is_preprint":false},{"year":2010,"finding":"In Drosophila, TSC1/2 loss causes rapid intestinal stem cell (ISC) loss through TORC1 hyperactivation; ISCs are rescued by S6K mutation or rapamycin treatment. Rheb overexpression recapitulates TSC1/2 disruption phenotype. Reduced TORC1-S6K signaling by S6K mutation alone has no effect on ISC maintenance, establishing that hyperactivation (not basal S6K activity) is detrimental.","method":"Drosophila genetic epistasis (Tsc1/Tsc2, S6k, Rheb mutants), rapamycin rescue, intestinal stem cell lineage tracing","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic epistasis in Drosophila ISC lineage with multiple alleles and rapamycin validation","pmids":["23843608"],"is_preprint":false},{"year":2010,"finding":"Constitutively active p70 S6K (but not wild-type p70 S6K) expression in human embryonic stem cells induces differentiation; siRNA knockdown of both TSC2 and Rictor elevates p70 S6K activation and also induces hESC differentiation, establishing that mTORC1/p70 S6K-mediated protein translation must be suppressed (via high TSC1/TSC2) to maintain pluripotency.","method":"Constitutively active p70 S6K expression, siRNA knockdown of TSC2 and Rictor, pluripotency marker (Oct4, Nanog) expression, rapamycin treatment","journal":"Cellular reprogramming","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — constitutively active mutant with defined differentiation phenotype, siRNA validation; single lab with two orthogonal genetic approaches","pmids":["20698768"],"is_preprint":false},{"year":2010,"finding":"Leucine-induced activation of the cardiac mTOR/p70(S6K) pathway requires PDK1 via a mechanism independent of PKB/Akt: in PDK1 knockout hearts, leucine fails to phosphorylate mTOR, PRAS40, and p70(S6K); a PDK1 L155E mutation (which preserves insulin/PKB-dependent mTOR/S6K phosphorylation) abolishes all leucine effects, distinguishing leucine and insulin signaling routes to p70(S6K).","method":"PDK1 cardiac-specific knockout mice, PDK1 L155E knock-in, leucine and insulin stimulation, mTOR/p70(S6K)/PRAS40 phosphorylation Western blot","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — two distinct mouse genetic models (KO and point mutant knock-in) dissecting leucine vs. insulin routes to p70(S6K) activation","pmids":["20051528"],"is_preprint":false},{"year":2012,"finding":"S6K inhibition (by rapamycin or PF-4708671) after myocardial infarction enhances Akt Thr308 phosphorylation via PDK1; cardiomyocyte-specific deletion of PDK1 and Akt1/3 abolishes the cardioprotective effect, establishing that S6K inhibition protects the heart by relieving negative feedback on the PDK1-Akt axis.","method":"Rapamycin and PF-4708671 treatment in MI mouse model, PDK1 and Akt1/3 cardiomyocyte-specific knockout, Akt Thr308 phosphorylation Western blot, cardiac function measurements","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic rescue experiment (PDK1/Akt1/3 double KO abolishes pharmacologic protection), pharmacological + genetic orthogonal validation","pmids":["21906027"],"is_preprint":false},{"year":2016,"finding":"In C. elegans, rsks-1/S6K loss-of-function extends lifespan and requires the creatine kinase ortholog ARGK-1. ARGK-1 is the most enriched protein in rsks-1 mutants by proteomics; ARGK-1 overexpression extends lifespan in part by activating AMPK (AAK-2). ARGK-1 is also required for reduced body size and increased stress resistance in rsks-1 mutants. Creatine kinase levels are elevated in brains of S6K1 knockout mice.","method":"C. elegans proteomics comparing rsks-1 mutants vs. wild-type, ARGK-1 overexpression lifespan assay, aak-2/AMPK epistasis, S6K1 knockout mouse brain creatine kinase measurement","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics plus genetic validation in C. elegans and mouse KO; ARGK-1 as longevity effector downstream of S6K established by multiple methods","pmids":["26923601"],"is_preprint":false},{"year":2024,"finding":"S6K in Drosophila fat body mediates TORC1-dependent regulation of lysosome morphology (multilamellar lysosomes) and inflammaging via the NF-κB-like IMD pathway. Syntaxin 13 mediates the effects of TORC1-S6K on lysosome morphology and inflammaging. Rapamycin treatment in mice elevates Syntaxin 12/13 levels in liver and prevents age-related increase in noncanonical NF-κB signaling, indicating conservation of the mechanism.","method":"Tissue-specific S6K expression in Drosophila fat body, rapamycin treatment, Syntaxin 13 genetic epistasis, lysosome morphology analysis, IMD pathway activity assays, mouse liver rapamycin treatment with NF-κB measurement","journal":"Nature aging","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Drosophila genetic epistasis with fat-body-specific S6K activation, Syntaxin 13 as mediator identified genetically, conservation confirmed in mouse liver; single lab","pmids":["38413780"],"is_preprint":false},{"year":2015,"finding":"Hepatic amino acid/mTORC1/S6K signaling modulates systemic lipid metabolism via neuronal inter-tissue communication. Hepatic expression of active S6K elevates serum triglycerides and downregulates adipose lipoprotein lipase (LPL); dominant-negative S6K inhibits TG elevation; denervation, deafferentation, and β-blockers suppress the effect, demonstrating that S6K signals from liver to adipose via afferent vagal and efferent sympathetic nerves.","method":"Hepatic SNAT2/Rheb/active-S6K/DN-S6K viral expression, serum TG measurement, adipose LPL activity, surgical denervation, pharmacological deafferentation, β-blocker administration","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — dominant-negative and constitutively active S6K with multiple genetic/pharmacological interventions; neuronal pathway established by surgical and pharmacological denervation","pmids":["26268630"],"is_preprint":false},{"year":1999,"finding":"The 17q23 gene PS6K (RPS6KB1) is amplified in breast cancer; amplification is accompanied by corresponding increases in both mRNA and protein expression, localizing the gene to chromosome 17q23.","method":"Comparative genomic hybridization, FISH localization to 17q23, Northern blot, Western blot in breast tumor tissues and cell lines","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct gene amplification/expression measurement in tumors; multiple methods (CGH, Northern, Western); not mechanistic per se but establishes genomic amplification drives overexpression","pmids":["10197603"],"is_preprint":false},{"year":2013,"finding":"In C. elegans, rsks-1/S6K promotes germline stem cell (GSC) fate cell-autonomously, acts in parallel with glp-1/Notch and daf-2/insulin-IGF receptor pathways, and requires a conserved TOR phosphorylation site; rsks-1 promotes cell cycle progression and inhibits differentiation in the germline progenitor pool.","method":"C. elegans rsks-1 null mutants, germline-specific rescue, double-mutant analysis with glp-1, daf-2, ife-1, let-363/TOR, daf-15/RAPTOR, TOR phosphorylation site mutant","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — systematic genetic epistasis with multiple pathway components, germline-autonomous rescue, conserved phosphorylation site required","pmids":["22278922"],"is_preprint":false},{"year":2010,"finding":"Overexpression of constitutively active S6K in pancreatic β-cells improves insulin secretion but reduces β-cell mass by impairing G1-S cell cycle progression (increased p16, p27; decreased Cdk2) and increasing apoptosis. This is accompanied by downregulated IRS/Akt signaling, establishing that in vivo S6K activation creates β-cell insulin resistance via IRS negative feedback.","method":"Transgenic mice with rat insulin promoter-driven constitutively active S6K, β-cell mass and proliferation analysis, cell cycle marker Western blot, IRS/Akt phosphorylation, insulin secretion assay","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo transgenic mouse model with defined molecular pathway (IRS/Akt downregulation) and multiple cellular phenotypes (cell cycle, apoptosis, secretion)","pmids":["20622167"],"is_preprint":false}],"current_model":"RPS6KB1 (S6K1) is a serine/threonine kinase activated downstream of mTORC1 by sequential phosphorylation: mTOR phosphorylates T389 in the hydrophobic motif, which creates a docking site for the PDK1 PIF-binding pocket, enabling PDK1 to phosphorylate T229 in the activation loop; prior phosphorylation of the carboxyl-terminal autoinhibitory S/TP sites relieves intrasteric inhibition to facilitate these events. Once active, S6K1 phosphorylates the 40S ribosomal protein S6 to promote 5'TOP mRNA translation and ribosome biogenesis, phosphorylates eIF4B (S422) to enhance translation initiation, and phosphorylates IRS1/2 to create a negative feedback loop that attenuates insulin/IGF-1 signaling through PI3K-Akt; it also phosphorylates RNF168 (S60) to modulate DNA damage response, interacts with STING in a cGAS/TBK1-dependent manner to promote IRF3 activation, is dephosphorylated by the PP2A-B'/PPP2R5C holoenzyme, associates with the actin cytoskeleton and localizes to the leading-edge actin arc to regulate cell migration, and modulates lysosome morphology and NF-κB-mediated inflammaging via Syntaxin 13."},"narrative":{"mechanistic_narrative":"RPS6KB1 (p70 S6K1) is a serine/threonine kinase that operates downstream of mTOR to couple nutrient and growth-factor signaling to ribosome biogenesis, mRNA translation, and cell/organism growth [PMID:8887654, PMID:9560223, PMID:11752451]. Its activation is built on an ordered, intrasteric mechanism: phosphorylation of the C-terminal autoinhibitory S/TP sites relieves an amino-terminal constraint and cooperates with rapamycin-sensitive phosphorylation of the T389 hydrophobic-motif site, which in turn creates a docking interaction with the PIF-binding pocket of PDK1 to permit T229 activation-loop phosphorylation [PMID:8887654, PMID:9614086, PMID:11500365]. Inputs upstream of this cascade include amino-acid/tRNA-aminoacylation status acting through mTOR [PMID:9873056], distinct PDK1-dependent leucine versus insulin routes [PMID:20051528], and H2O2/Ca2+-mediated activation [PMID:10551813]; the kinase is reset by direct dephosphorylation through the PP2A-B'/PPP2R5C holoenzyme [PMID:20444422]. Genetically, S6K1 specifically controls ribosomal protein (5'TOP) mRNA translation and S6 phosphorylation, with loss buffered by the homolog S6K2 [PMID:9822608, PMID:9560223]. Active S6K1 phosphorylates eIF4B at Ser422 to enhance translation initiation [PMID:19289497] and drives degradation of the translational repressor PDCD4 to relieve eIF4A inhibition [PMID:33027666], while phosphorylating IRS1/2 to impose negative feedback that attenuates insulin/IGF-1–PI3K-Akt signaling—a circuit that links mTOR hyperactivation to insulin resistance and β-cell dysfunction [PMID:15380067, PMID:20622167, PMID:21906027]. Beyond translation, S6K1 phosphorylates RNF168 at Ser60 to suppress its E3 ligase activity and dampen the DNA-damage response [PMID:29403037], forms a cGAS/TBK1-dependent S6K1–STING–TBK1 complex required for IRF3-driven antiviral gene expression [PMID:27043414], associates with the F-actin cytoskeleton at the leading-edge actin arc to support migration [PMID:15149849], and—via Syntaxin 13—regulates lysosome morphology and NF-κB–mediated inflammaging [PMID:38413780]. Amplification of RPS6KB1 at 17q23 drives its overexpression in breast cancer [PMID:10197603].","teleology":[{"year":1996,"claim":"Established the regulatory architecture of S6K activation by defining T389 as the principal rapamycin-sensitive site that governs activation-loop T229 phosphorylation through an intrasteric mechanism gated by the C-terminal autoinhibitory domain.","evidence":"Truncation and point mutagenesis with kinase assays and multiple inhibitors (rapamycin, wortmannin)","pmids":["8887654"],"confidence":"High","gaps":["Did not identify the physiological kinases acting on T389 or T229","Intrasteric model inferred from mutants rather than structure"]},{"year":1998,"claim":"Resolved the order of activation by showing C-terminal S/TP phosphorylation relieves N-terminal autoinhibition and, with T389, converts S6K into a competent PDK1 substrate at the activation loop.","evidence":"Acidic-substitution mutants and in vitro PDK1 phosphorylation/kinase assays","pmids":["9614086"],"confidence":"High","gaps":["In vitro reconstitution; cellular kinetics of site phosphorylation not resolved"]},{"year":1998,"claim":"Demonstrated in vivo that S6K1 specifically controls ribosomal S6 phosphorylation and 5'TOP mRNA translation, dissecting this branch from rapamycin's effects on 4E-BP1 and general translation, and revealed compensation by the S6K2 homolog.","evidence":"Gene knockout in mice and ES cells with polysome profiling and S6 phosphorylation assays","pmids":["9822608","9560223"],"confidence":"High","gaps":["Redundancy with S6K2 obscures full loss-of-function phenotype","Direct S6 phosphorylation by S6K1 inferred from genetic readout"]},{"year":1999,"claim":"Connected S6K activity to developmental and physiological translational programs, showing it both promotes 5'TOP and suppresses non-5'TOP mRNA translation and correlates with muscle hypertrophy.","evidence":"Xenopus oocyte injection of constitutively active mutant with reporters; rat resistance-exercise model with kinase and polysome assays","pmids":["10082514","9886927"],"confidence":"Medium","gaps":["Muscle data correlative","Mechanism of selective non-5'TOP repression unresolved"]},{"year":1999,"claim":"Identified upstream inputs to S6K beyond classical growth factors: amino-acid/tRNA aminoacylation status through mTOR and H2O2/Ca2+-dependent activation upstream of PI3K and mTOR.","evidence":"tRNA-synthetase mutant and aminoacylation inhibitors with rapamycin-resistant mTOR; glucose oxidase/catalase and Ca2+ chelation with kinase assays","pmids":["9873056","10551813"],"confidence":"Medium","gaps":["Molecular sensor linking deacylated tRNA or ROS to mTOR not identified","ROS pathway placement inferred from inhibitor hierarchy"]},{"year":2001,"claim":"Defined the PDK1 PIF-binding pocket as the structural determinant required for S6K (and SGK1) but not Akt activation, mechanistically linking T389 docking to T-loop phosphorylation.","evidence":"PDK1 pocket mutants, co-IP, and comparative in vitro kinase assays across substrates","pmids":["11500365"],"confidence":"High","gaps":["Structural detail of the docking interaction not obtained in this study"]},{"year":2001,"claim":"Confirmed in vivo that PDK1 routes insulin/growth signaling to organismal growth through two parallel branches, Akt and S6K.","evidence":"Drosophila genetic epistasis with dPDK1 loss/gain of function and substrate activity measurements","pmids":["11752451"],"confidence":"High","gaps":["Branch-specific contributions to growth not quantitatively separated"]},{"year":2004,"claim":"Established S6K-mediated negative feedback on IRS1/2 as the mechanism linking mTOR hyperactivation to insulin resistance, decoupling Akt from IRS-dependent growth-factor inputs.","evidence":"TSC1/TSC2 deletion and Rheb overexpression with IRS1/2 and Akt phosphorylation assays","pmids":["15380067"],"confidence":"High","gaps":["Direct IRS phosphorylation sites by S6K not mapped in this study"]},{"year":2004,"claim":"Extended S6K function beyond catalysis to localization and non-substrate partnerships, placing S6K at the actin arc with mTOR/Akt/PDK1 in migration and identifying CoA synthase and the PDK1-PILSAP complex as physical associations.","evidence":"F-actin cosedimentation and immunocytochemistry with rapamycin; reciprocal co-IP/BIAcore; dominant-negative PILSAP with in vivo angiogenesis","pmids":["15149849","15589845","15187024"],"confidence":"Medium","gaps":["Functional consequence of CoA synthase binding unclear","Actin-localization study from a single lab","How PILSAP-processed PDK1 selects S6K not fully resolved"]},{"year":2009,"claim":"Identified eIF4B Ser422 as a direct S6K1 substrate that enhances eIF3A association and ATPase activity, defining a translation-initiation effector required for interferon-dependent protein expression.","evidence":"S6k1/S6k2 double-KO MEFs, eIF4B phosphorylation, eIF3A co-IP, and ATPase assays","pmids":["19289497"],"confidence":"High","gaps":["Relative contribution of S6K1 vs S6K2 to eIF4B phosphorylation not isolated"]},{"year":2010,"claim":"Defined the off-switch for S6K by identifying the PP2A-B'/PPP2R5C holoenzyme as a conserved direct phosphatase counteracting S6K phosphorylation.","evidence":"PP2A-B' knockout Drosophila, co-IP, and PPP2R5C knockdown in human cells","pmids":["20444422"],"confidence":"High","gaps":["Specific S6K residues dephosphorylated by PP2A-B' not mapped"]},{"year":2010,"claim":"Demonstrated that S6K hyperactivation, not basal activity, is detrimental across stem-cell and tissue contexts, linking S6K-driven translation to loss of pluripotency, β-cell dysfunction, and stem-cell loss.","evidence":"Constitutively active S6K in hESCs; transgenic active-S6K β-cells; Drosophila TSC1/2-S6K intestinal stem-cell epistasis","pmids":["20698768","20622167","23843608"],"confidence":"Medium","gaps":["β-cell phenotype tied to IRS/Akt feedback but direct targets not all defined","hESC study single lab"]},{"year":2012,"claim":"Showed therapeutically that relieving S6K-imposed feedback on the PDK1-Akt axis underlies cardioprotection by S6K inhibition.","evidence":"Rapamycin/PF-4708671 in MI model with cardiomyocyte-specific PDK1 and Akt1/3 knockouts","pmids":["21906027"],"confidence":"High","gaps":["Whether feedback operates via IRS or other adaptors in heart not specified"]},{"year":2013,"claim":"Established cell-autonomous S6K control of stem-cell fate, with S6K promoting germline progenitor proliferation in parallel to Notch and insulin/IGF pathways via a conserved TOR phosphorylation site.","evidence":"C. elegans rsks-1 genetic epistasis with germline-autonomous rescue","pmids":["22278922"],"confidence":"High","gaps":["Downstream translational targets driving GSC fate not identified"]},{"year":2015,"claim":"Revealed an inter-tissue role: hepatic amino-acid/mTORC1/S6K signaling controls systemic lipid metabolism through afferent vagal and efferent sympathetic neuronal relays.","evidence":"Hepatic active/dominant-negative S6K viral expression with surgical denervation, deafferentation, and β-blockers","pmids":["26268630"],"confidence":"Medium","gaps":["Molecular signal from liver to nerve not identified","Single lab"]},{"year":2016,"claim":"Identified creatine kinase (ARGK-1) as a longevity effector downstream of S6K loss, linking reduced S6K to AMPK activation and extended lifespan.","evidence":"C. elegans rsks-1 proteomics, ARGK-1 overexpression lifespan/AMPK epistasis, and S6K1-KO mouse brain measurement","pmids":["26923601"],"confidence":"Medium","gaps":["How S6K loss elevates ARGK-1 not mechanistically defined","Lifespan link extrapolated from invertebrate to mouse only at protein-level"]},{"year":2016,"claim":"Expanded S6K into innate immunity by showing its kinase domain (not activity) scaffolds a cGAS/TBK1-dependent S6K1-STING-TBK1 complex required for IRF3 activation and antiviral responses.","evidence":"Reciprocal co-IP, kinase-dead and domain mutants, cGAS-deficient cells, TBK1 depletion, and in vivo antiviral assays","pmids":["27043414"],"confidence":"High","gaps":["Structural basis of S6K1-STING contact not resolved"]},{"year":2018,"claim":"Connected S6K to genome maintenance by identifying RNF168 Ser60 as a direct substrate whose phosphorylation inhibits ligase activity and promotes proteolysis, impairing the DNA-damage response.","evidence":"Phosphosite mapping, ligase and stability assays, and phospho-deficient RNF168-S60A rescue in Lkb1-null tumors","pmids":["29403037"],"confidence":"High","gaps":["Generality of this DDR effect across tissues beyond LKB1-loss context not established"]},{"year":2020,"claim":"Showed mitotic suppression of mTORC1-S6K stabilizes PDCD4 to repress eIF4A, defining an S6K/PDCD4/eIF4A axis that governs cell fate during mitotic arrest and chemosensitivity.","evidence":"Non-phosphorylatable raptor mutant, PDCD4 stability assays, eIF4A inhibition, and Taxol-sensitivity readouts","pmids":["33027666"],"confidence":"High","gaps":["Direct S6K phosphorylation site on PDCD4 not mapped here"]},{"year":2024,"claim":"Linked TORC1-S6K to organelle homeostasis and aging, identifying Syntaxin 13 as the mediator of S6K-dependent lysosome morphology and NF-κB-mediated inflammaging.","evidence":"Drosophila fat-body S6K epistasis with Syntaxin 13 and lysosome/IMD readouts; conservation via mouse liver rapamycin and NF-κB measurement","pmids":["38413780"],"confidence":"Medium","gaps":["Whether S6K directly phosphorylates Syntaxin 13 unknown","Single lab"]},{"year":null,"claim":"How S6K1 substrate selection is spatially partitioned among translation, DNA-damage, innate-immune, cytoskeletal, and organelle pathways—and which scaffolds or localizations direct each output—remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model of how one kinase coordinates distinct effector branches","Structural basis for non-catalytic scaffolding (e.g. STING) not determined","Direct phosphosites on several effectors (IRS, PDCD4, Syntaxin 13) not all mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,9,12,17]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,1,2,12]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[4,12,17]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[11]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[11]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[4,12,17]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,7,21,22]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[4,5]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[10,12]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[9]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[25,7]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[18,27,20]}],"complexes":["S6K1-STING-TBK1 complex","PDK1-PILSAP complex"],"partners":["PDK1","STING1","TBK1","PPP2R5C","EIF4B","EIF3A","RNF168","STX12"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P23443","full_name":"Ribosomal protein S6 kinase beta-1","aliases":["70 kDa ribosomal protein S6 kinase 1","P70S6K1","p70-S6K 1","Ribosomal protein S6 kinase I","Serine/threonine-protein kinase 14A","p70 ribosomal S6 kinase alpha","p70 S6 kinase alpha","p70 S6K-alpha","p70 S6KA"],"length_aa":525,"mass_kda":59.1,"function":"Serine/threonine-protein kinase that acts downstream of mTOR signaling in response to growth factors and nutrients to promote cell proliferation, cell growth and cell cycle progression (PubMed:11500364, PubMed:12801526, PubMed:14673156, PubMed:15071500, PubMed:15341740, PubMed:16286006, PubMed:17052453, PubMed:17053147, PubMed:17936702, PubMed:18952604, PubMed:19085255, PubMed:19720745, PubMed:19935711, PubMed:19995915, PubMed:22017876, PubMed:23429703, PubMed:28178239). Regulates protein synthesis through phosphorylation of EIF4B, RPS6 and EEF2K, and contributes to cell survival by repressing the pro-apoptotic function of BAD (PubMed:11500364, PubMed:12801526, PubMed:14673156, PubMed:15071500, PubMed:15341740, PubMed:16286006, PubMed:17052453, PubMed:17053147, PubMed:17936702, PubMed:18952604, PubMed:19085255, PubMed:19720745, PubMed:19935711, PubMed:19995915, PubMed:22017876, PubMed:23429703, PubMed:28178239). Under conditions of nutrient depletion, the inactive form associates with the EIF3 translation initiation complex (PubMed:16286006). Upon mitogenic stimulation, phosphorylation by the mechanistic target of rapamycin complex 1 (mTORC1) leads to dissociation from the EIF3 complex and activation (PubMed:16286006). The active form then phosphorylates and activates several substrates in the pre-initiation complex, including the EIF2B complex and the cap-binding complex component EIF4B (PubMed:16286006). Also controls translation initiation by phosphorylating a negative regulator of EIF4A, PDCD4, targeting it for ubiquitination and subsequent proteolysis (PubMed:17053147). Promotes initiation of the pioneer round of protein synthesis by phosphorylating POLDIP3/SKAR (PubMed:15341740). In response to IGF1, activates translation elongation by phosphorylating EEF2 kinase (EEF2K), which leads to its inhibition and thus activation of EEF2 (PubMed:11500364). Also plays a role in feedback regulation of mTORC2 by mTORC1 by phosphorylating MAPKAP1/SIN1, MTOR and RICTOR, resulting in the inhibition of mTORC2 and AKT1 signaling (PubMed:15899889, PubMed:19720745, PubMed:19935711, PubMed:19995915). Also involved in feedback regulation of mTORC1 and mTORC2 by phosphorylating DEPTOR (PubMed:22017876). Mediates cell survival by phosphorylating the pro-apoptotic protein BAD and suppressing its pro-apoptotic function (By similarity). Phosphorylates mitochondrial URI1 leading to dissociation of a URI1-PPP1CC complex (PubMed:17936702). The free mitochondrial PPP1CC can then dephosphorylate RPS6KB1 at Thr-412, which is proposed to be a negative feedback mechanism for the RPS6KB1 anti-apoptotic function (PubMed:17936702). Mediates TNF-induced insulin resistance by phosphorylating IRS1 at multiple serine residues, resulting in accelerated degradation of IRS1 (PubMed:18952604). In cells lacking functional TSC1-2 complex, constitutively phosphorylates and inhibits GSK3B (PubMed:17052453). May be involved in cytoskeletal rearrangement through binding to neurabin (By similarity). Phosphorylates and activates the pyrimidine biosynthesis enzyme CAD, downstream of MTOR (PubMed:23429703). Following activation by mTORC1, phosphorylates EPRS and thereby plays a key role in fatty acid uptake by adipocytes and also most probably in interferon-gamma-induced translation inhibition (PubMed:28178239)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P23443/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RPS6KB1","classification":"Not Classified","n_dependent_lines":36,"n_total_lines":1208,"dependency_fraction":0.029801324503311258},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000108443","cell_line_id":"CID001266","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleoplasm","grade":3}],"interactors":[{"gene":"TUBB4A","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001266","total_profiled":1310},"omim":[{"mim_id":"621460","title":"NEURODEVELOPMENTAL DISORDER WITH SPASTICITY, THIN CORPUS CALLOSUM, AND DECREASED BRAIN WHITE MATTER; NEDSCW","url":"https://www.omim.org/entry/621460"},{"mim_id":"619331","title":"MTOR-ASSOCIATED PROTEIN, EAK7 HOMOLOG; MEAK7","url":"https://www.omim.org/entry/619331"},{"mim_id":"619294","title":"NIBAN APOPTOSIS REGULATOR 1; NIBAN1","url":"https://www.omim.org/entry/619294"},{"mim_id":"618990","title":"EVA1 HOMOLOG A, REGULATOR OF PROGRAMMED CELL DEATH; EVA1A","url":"https://www.omim.org/entry/618990"},{"mim_id":"617517","title":"RIBOSOMAL PROTEIN S6 KINASE C1; RPS6KC1","url":"https://www.omim.org/entry/617517"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/RPS6KB1"},"hgnc":{"alias_symbol":["S6K1","p70(S6K)-alpha","PS6K","S6K"],"prev_symbol":["STK14A"]},"alphafold":{"accession":"P23443","domains":[{"cath_id":"3.30.200.20","chopping":"86-176_378-426","consensus_level":"medium","plddt":87.4411,"start":86,"end":426},{"cath_id":"1.10.510.10","chopping":"179-372","consensus_level":"medium","plddt":93.3455,"start":179,"end":372}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P23443","model_url":"https://alphafold.ebi.ac.uk/files/AF-P23443-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P23443-F1-predicted_aligned_error_v6.png","plddt_mean":72.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RPS6KB1","jax_strain_url":"https://www.jax.org/strain/search?query=RPS6KB1"},"sequence":{"accession":"P23443","fasta_url":"https://rest.uniprot.org/uniprotkb/P23443.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P23443/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P23443"}},"corpus_meta":[{"pmid":"24917457","id":"PMC_24917457","title":"Short-chain 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T-389 is the principal regulatory site whose phosphorylation, together with hyperphosphorylation of the carboxyl-terminal autoinhibitory domain S/TP sites, controls T-229 phosphorylation through an intrasteric mechanism. Mutation of T-389 to an acidic residue confers resistance to rapamycin, wortmannin, and SQ20006, while T-229 phosphorylation is regulated by internal mechanisms and is differentially sensitive to inhibitors.\",\n      \"method\": \"Truncation and point mutants of p70(S6K), phosphorylation site mapping, kinase activity assays with inhibitors (rapamycin, wortmannin, SQ20006)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — systematic mutagenesis of activation loop and hydrophobic motif sites combined with kinase assays, multiple mutant combinations tested with multiple inhibitors\",\n      \"pmids\": [\"8887654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Phosphorylation of the carboxyl-terminal autoinhibitory domain S/TP sites mimics the effect of carboxyl-terminal deletion and rescues kinase activation caused by amino-terminal truncation. Phosphorylation of T-389 in cooperation with the S/TP site phosphorylations controls T-229 (activation loop) phosphorylation through an intrasteric mechanism. A mutant harboring acidic substitutions at both S/TP sites and T-389 is an excellent in vitro substrate for PDK1 (the T-229 kinase), whereas single-substitution variants are poor PDK1 substrates.\",\n      \"method\": \"Point mutagenesis of p70(S6K) S/TP autoinhibitory sites to acidic residues, in vitro PDK1 phosphorylation assays, kinase activity measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro phosphorylation by PDK1, systematic mutagenesis of multiple regulatory sites with functional validation\",\n      \"pmids\": [\"9614086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"PDK1 activates S6K1 at the T-loop (T229) via interaction with the PIF-binding pocket in PDK1's kinase domain. Prior phosphorylation of S6K1 at its hydrophobic motif (T389) promotes interaction with the PIF-binding pocket of PDK1 and subsequent T-loop phosphorylation. This pocket is required for S6K1 and SGK1 activation but not for PKB/Akt phosphorylation by PDK1.\",\n      \"method\": \"PIF-binding pocket mutants of PDK1, in vitro kinase assays, co-immunoprecipitation, functional activation studies with S6K1, SGK1, and PKB\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro phosphorylation, mutagenesis of PDK1 pocket, multiple substrates compared in same study\",\n      \"pmids\": [\"11500365\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Genetic disruption of the p70(S6K)/p85(S6K) gene in mice results in a small growth phenotype (particularly during embryogenesis) but not lethality or infertility. Despite loss of p70/p85-S6K, S6 phosphorylation and 5'TOP mRNA translational up-regulation proceed normally in response to mitogens and remain rapamycin-sensitive, due to compensatory up-regulation of a novel homolog S6K2.\",\n      \"method\": \"Gene knockout in mice, polysome profiling, S6 phosphorylation Western blot, rapamycin sensitivity assays in mouse embryo fibroblasts\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout mouse with defined phenotypic readouts, multiple orthogonal assays (S6 phosphorylation, 5'TOP mRNA translation, rapamycin sensitivity)\",\n      \"pmids\": [\"9822608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Targeted disruption of p70(S6K) in murine embryonic stem cells eliminates ribosomal S6 phosphorylation and abolishes serum-induced translational up-regulation of ribosomal protein mRNAs (5'TOP mRNAs), establishing that p70(S6K) specifically controls ribosomal biogenesis by regulating ribosomal protein synthesis at the level of mRNA translation. Rapamycin inhibition of 4E-BP1 phosphorylation, general mRNA translation, and overall protein synthesis proceeds independently of p70(S6K).\",\n      \"method\": \"Gene targeting in ES cells, ribosomal S6 phosphorylation assay, selective mRNA translation assays, rapamycin treatment\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with specific molecular phenotype (S6 phosphorylation loss, 5'TOP translation defect) and dissection from 4E-BP1/general translation pathway\",\n      \"pmids\": [\"9560223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"p70(S6K) activity is high in resting Xenopus oocytes and decreases upon progesterone-induced maturation, with three peaks during embryogenesis. Rapamycin-sensitive p70(S6K) activity suppresses translation of non-5'TOP mRNAs (mos, Cdc25A) while promoting 5'TOP mRNA translation; a rapamycin-insensitive constitutively active p70(S6K) mutant reverses rapamycin effects on oocyte maturation timing.\",\n      \"method\": \"Xenopus oocyte injection of rapamycin-insensitive constitutively active p70(S6K) mutant, translation assays with 5'TOP and non-5'TOP reporter constructs, kinase activity measurements during development\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — rescue with constitutively active mutant, reporter translation assays, multiple developmental time points\",\n      \"pmids\": [\"10082514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Amino acid-dependent activation of p70(S6K) requires mTOR and involves tRNA aminoacylation: amino acid alcohols (inhibitors of tRNA aminoacylation), cycloheximide/puromycin (which block use of aminoacylated tRNA), and a temperature-sensitive histidyl-tRNA synthetase mutant each suppress p70(S6K) activity, indicating that deacylated tRNA is a negative regulator of p70(S6K).\",\n      \"method\": \"Amino acid alcohol treatment, cycloheximide/puromycin treatment, temperature-sensitive tRNA synthetase mutant cells, rapamycin and wortmannin inhibition, mTOR rapamycin-resistant mutant (S2035I)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal genetic and pharmacological approaches converge on tRNA aminoacylation as upstream regulator; rapamycin-resistant mTOR mutant confirms mTOR requirement\",\n      \"pmids\": [\"9873056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Constitutive activation of the Rheb/mTOR/S6K pathway (by TSC1 or TSC2 deletion or ectopic Rheb expression) induces insulin resistance through downregulation of IRS1 and IRS2, making Akt completely refractory to IRS-dependent growth factor activation (insulin/IGF-I) but not to IRS-independent pathways (PDGF). This establishes S6K-mediated negative feedback on IRS1/2 as the mechanism linking mTOR hyperactivation to insulin resistance.\",\n      \"method\": \"Genetic deletion of TSC1 or TSC2, ectopic Rheb expression, IRS1/2 Western blot, Akt phosphorylation assays, growth factor stimulation with insulin/IGF-I vs PDGF\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models (TSC1 KO, TSC2 KO, Rheb overexpression) with defined molecular mechanism (IRS1/2 downregulation) and functional validation (Akt activation)\",\n      \"pmids\": [\"15380067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The Drosophila B' regulatory subunit of PP2A (PP2A-B') directly dephosphorylates S6K; PP2A-B' knockout flies exhibit elevated S6K phosphorylation. The human homolog PPP2R5C also counteracts S6K1 phosphorylation, indicating a conserved mechanism. PP2A-B' physically and genetically interacts with S6K.\",\n      \"method\": \"PP2A-B' knockout Drosophila, S6K phosphorylation Western blot, co-immunoprecipitation (physical interaction), genetic interaction studies, PPP2R5C knockdown in human cells\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout flies with defined phosphorylation phenotype, physical interaction, conserved mechanism validated in human cells with two orthogonal methods\",\n      \"pmids\": [\"20444422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The mTOR-S6K pathway phosphorylates RNF168 at Ser60, inhibiting its E3 ubiquitin ligase activity, accelerating its proteolysis, and impairing DNA damage response (DDR). Loss of LKB1 hyperactivates mTORC1-S6K, decreases RNF168 expression, and causes DDR defects; a phospho-deficient RNF168-S60A mutant rescues DDR and suppresses tumorigenesis caused by Lkb1 loss.\",\n      \"method\": \"Phosphorylation site identification (Ser60 on RNF168), S6K kinase assay, RNF168 ubiquitin ligase activity assay, RNF168 stability/proteolysis assays, phospho-deficient mutant rescue in Lkb1-null cells/tumors\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct phosphorylation of substrate (RNF168-S60) by S6K established biochemically, mutant rescue in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"29403037\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"S6K1 physically interacts with the signaling adaptor STING in a cGAS-dependent manner upon DNA virus infection. The kinase domain (but not kinase activity) of S6K1 is required for the S6K1-STING interaction; TBK1 critically promotes formation of a tripartite S6K1-STING-TBK1 complex, which is necessary for IRF3 activation and antiviral gene expression.\",\n      \"method\": \"Co-immunoprecipitation, kinase-dead S6K1 mutants, cGAS-deficient cells, TBK1 inhibition/depletion, IRF3 activation assays, antiviral immune response assays in vivo\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, domain-mapping mutants, multiple genetic perturbations defining the tripartite complex, in vivo functional validation\",\n      \"pmids\": [\"27043414\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"p70(S6K) associates with the F-actin cytoskeleton (cosedimentation and subcellular fractionation) and localizes with activated mTOR at the actin arc (a caveolin-enriched structure at the leading edge of migrating cells) along with Akt1, PDK1, and p85-PI3K. EGF-induced actin arc formation (a correlate of migration) is blocked by rapamycin. Stress fibers down-regulate p70(S6K) activity; disruption of stress fibers increases p70(S6K) activity, establishing a functional link between the actin cytoskeleton and p70(S6K) in cell migration.\",\n      \"method\": \"F-actin cosedimentation, subcellular fractionation, immunocytochemistry with phospho-specific mTOR antibody, rapamycin treatment, cytochalasin D and Rho kinase inhibitor treatment\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization to actin compartments with functional consequence (migration/actin arc formation blocked by rapamycin), single lab with multiple orthogonal methods\",\n      \"pmids\": [\"15149849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"S6K1 interferon-dependent phosphorylates eIF4B at Ser422, enhancing eIF4B interaction with eIF3A and increasing eIF3A-associated ATPase activity. IFN-inducible eIF4B activity and downstream protein expression (ISG15, CXCL-10) are diminished in S6k1/S6k2 double-knockout MEFs, establishing S6K1 as required for IFN-dependent mRNA translation.\",\n      \"method\": \"S6k1/S6k2 double-knockout MEFs, eIF4B Ser422 phosphorylation assay, eIF3A co-immunoprecipitation, ATPase activity assay, ISG15/CXCL-10 protein expression, eIF4B/eIF3A siRNA knockdown\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — double-KO MEFs with defined phenotype, in vitro phosphorylation, protein-protein interaction, ATPase functional assay — multiple orthogonal methods\",\n      \"pmids\": [\"19289497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"S6K1 specifically binds CoA synthase; the interaction involves the C-terminal regions of both proteins (mapped by in vivo co-immunoprecipitation and in vitro BIAcore analysis). CoA synthase is not a substrate for S6K1 and the interaction does not affect their enzymatic activities, but the association suggests a link between mTOR/S6K signaling and CoA biosynthesis/energy metabolism.\",\n      \"method\": \"Co-immunoprecipitation of native and transiently overexpressed proteins, BIAcore binding analysis, C-terminal domain mapping, in vitro kinase assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus in vitro BIAcore, domain mapping; functional consequence remains unclear\",\n      \"pmids\": [\"15589845\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PILSAP (a leucyl aminopeptidase) binds PDK1 and removes 9 amino acids from its N-terminus, which allows S6K to associate with the PDK1-PILSAP complex and become activated upon VEGF stimulation. Mutant PILSAP lacking aminopeptidase activity but retaining PDK1 binding acts as a dominant-negative inhibitor of S6K activation and angiogenesis in vivo.\",\n      \"method\": \"Co-immunoprecipitation, dominant-negative PILSAP mutant, N-terminal truncated PDK1 rescue, CDK4/6 activity and Rb phosphorylation assays, in vivo tumor angiogenesis model\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP demonstrating PDK1-S6K-PILSAP complex, dominant-negative rescue with truncated PDK1, multiple functional readouts, in vivo validation\",\n      \"pmids\": [\"15187024\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"p70(S6K) phosphorylation (activity) in rat skeletal muscle 6 h after high-resistance exercise correlates (r=0.998) with long-term skeletal muscle hypertrophy after 6 weeks of training. Polysome profiles after high-resistance contractions indicate increased translational initiation rate, and p70(S6K) activity is elevated 3.5-fold in the EDL and TA muscles.\",\n      \"method\": \"Rat resistance exercise model, immune complex p70(S6K) kinase assay, polysome profiling, muscle mass measurement after training\",\n      \"journal\": \"The American journal of physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — correlative but direct measurement of kinase activity and polysome profiles in vivo; single lab, single method per readout\",\n      \"pmids\": [\"9886927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"H2O2 generated by glucose/glucose oxidase activates p70(S6K) in mouse epidermal cells (JB6) via a Ca2+-dependent mechanism acting upstream of PI3K and mTOR/FRAP. Growth factors (PDGF, EGF) induce p70(S6K) activation through H2O2 generation; catalase blocks both growth factor-induced H2O2 and p70(S6K) activation. TPA-responsive PKC is not required for ROS-induced p70(S6K) activation.\",\n      \"method\": \"Exogenous H2O2, glucose/glucose oxidase system, catalase treatment, rapamycin and wortmannin inhibition, Ca2+ chelation, PKC downregulation, immune complex kinase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — multiple pharmacological inhibitors and scavengers, single lab; mechanistic pathway placement via inhibitor hierarchy\",\n      \"pmids\": [\"10551813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"During mitosis, mTORC1 activity is dramatically reduced, which prevents S6K-mediated phosphorylation and degradation of the tumor suppressor PDCD4. PDCD4 inhibits eIF4A activity; the mTORC1/S6K/PDCD4/eIF4A axis determines the outcome (death vs. slippage) during mitotic arrest. Expression of a non-phosphorylatable raptor mutant reactivates mTORC1 during mitosis, promotes PDCD4 degradation, and reduces Taxol cytotoxicity.\",\n      \"method\": \"Non-phosphorylatable raptor mutant expression, PDCD4 stability assays, eIF4A inhibition, Taxol sensitivity assays, cell death vs. slippage quantification\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — raptor phospho-mutant rescue, PDCD4 degradation assay, eIF4A pharmacological inhibition, multiple orthogonal readouts of mitotic outcome\",\n      \"pmids\": [\"33027666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"In Drosophila, dPDK1 controls cellular and organism growth by activating both dAkt and dS6K (ribosomal S6 kinase); dPDK1 genetically interacts with dRSK but not dPKN, indicating dPDK1 regulates insulin-mediated growth through two main branches: dAkt and dS6K.\",\n      \"method\": \"Drosophila genetic epistasis, dPDK1 loss-of-function and gain-of-function, dAkt and dS6K activity measurements, genetic interaction tests with dRSK and dPKN\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Drosophila ortholog study with clean genetic epistasis, in vivo growth phenotypes, multiple kinase substrates tested\",\n      \"pmids\": [\"11752451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In Drosophila, TSC1/2 loss causes rapid intestinal stem cell (ISC) loss through TORC1 hyperactivation; ISCs are rescued by S6K mutation or rapamycin treatment. Rheb overexpression recapitulates TSC1/2 disruption phenotype. Reduced TORC1-S6K signaling by S6K mutation alone has no effect on ISC maintenance, establishing that hyperactivation (not basal S6K activity) is detrimental.\",\n      \"method\": \"Drosophila genetic epistasis (Tsc1/Tsc2, S6k, Rheb mutants), rapamycin rescue, intestinal stem cell lineage tracing\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic epistasis in Drosophila ISC lineage with multiple alleles and rapamycin validation\",\n      \"pmids\": [\"23843608\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Constitutively active p70 S6K (but not wild-type p70 S6K) expression in human embryonic stem cells induces differentiation; siRNA knockdown of both TSC2 and Rictor elevates p70 S6K activation and also induces hESC differentiation, establishing that mTORC1/p70 S6K-mediated protein translation must be suppressed (via high TSC1/TSC2) to maintain pluripotency.\",\n      \"method\": \"Constitutively active p70 S6K expression, siRNA knockdown of TSC2 and Rictor, pluripotency marker (Oct4, Nanog) expression, rapamycin treatment\",\n      \"journal\": \"Cellular reprogramming\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — constitutively active mutant with defined differentiation phenotype, siRNA validation; single lab with two orthogonal genetic approaches\",\n      \"pmids\": [\"20698768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Leucine-induced activation of the cardiac mTOR/p70(S6K) pathway requires PDK1 via a mechanism independent of PKB/Akt: in PDK1 knockout hearts, leucine fails to phosphorylate mTOR, PRAS40, and p70(S6K); a PDK1 L155E mutation (which preserves insulin/PKB-dependent mTOR/S6K phosphorylation) abolishes all leucine effects, distinguishing leucine and insulin signaling routes to p70(S6K).\",\n      \"method\": \"PDK1 cardiac-specific knockout mice, PDK1 L155E knock-in, leucine and insulin stimulation, mTOR/p70(S6K)/PRAS40 phosphorylation Western blot\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two distinct mouse genetic models (KO and point mutant knock-in) dissecting leucine vs. insulin routes to p70(S6K) activation\",\n      \"pmids\": [\"20051528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"S6K inhibition (by rapamycin or PF-4708671) after myocardial infarction enhances Akt Thr308 phosphorylation via PDK1; cardiomyocyte-specific deletion of PDK1 and Akt1/3 abolishes the cardioprotective effect, establishing that S6K inhibition protects the heart by relieving negative feedback on the PDK1-Akt axis.\",\n      \"method\": \"Rapamycin and PF-4708671 treatment in MI mouse model, PDK1 and Akt1/3 cardiomyocyte-specific knockout, Akt Thr308 phosphorylation Western blot, cardiac function measurements\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic rescue experiment (PDK1/Akt1/3 double KO abolishes pharmacologic protection), pharmacological + genetic orthogonal validation\",\n      \"pmids\": [\"21906027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In C. elegans, rsks-1/S6K loss-of-function extends lifespan and requires the creatine kinase ortholog ARGK-1. ARGK-1 is the most enriched protein in rsks-1 mutants by proteomics; ARGK-1 overexpression extends lifespan in part by activating AMPK (AAK-2). ARGK-1 is also required for reduced body size and increased stress resistance in rsks-1 mutants. Creatine kinase levels are elevated in brains of S6K1 knockout mice.\",\n      \"method\": \"C. elegans proteomics comparing rsks-1 mutants vs. wild-type, ARGK-1 overexpression lifespan assay, aak-2/AMPK epistasis, S6K1 knockout mouse brain creatine kinase measurement\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics plus genetic validation in C. elegans and mouse KO; ARGK-1 as longevity effector downstream of S6K established by multiple methods\",\n      \"pmids\": [\"26923601\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"S6K in Drosophila fat body mediates TORC1-dependent regulation of lysosome morphology (multilamellar lysosomes) and inflammaging via the NF-κB-like IMD pathway. Syntaxin 13 mediates the effects of TORC1-S6K on lysosome morphology and inflammaging. Rapamycin treatment in mice elevates Syntaxin 12/13 levels in liver and prevents age-related increase in noncanonical NF-κB signaling, indicating conservation of the mechanism.\",\n      \"method\": \"Tissue-specific S6K expression in Drosophila fat body, rapamycin treatment, Syntaxin 13 genetic epistasis, lysosome morphology analysis, IMD pathway activity assays, mouse liver rapamycin treatment with NF-κB measurement\",\n      \"journal\": \"Nature aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Drosophila genetic epistasis with fat-body-specific S6K activation, Syntaxin 13 as mediator identified genetically, conservation confirmed in mouse liver; single lab\",\n      \"pmids\": [\"38413780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Hepatic amino acid/mTORC1/S6K signaling modulates systemic lipid metabolism via neuronal inter-tissue communication. Hepatic expression of active S6K elevates serum triglycerides and downregulates adipose lipoprotein lipase (LPL); dominant-negative S6K inhibits TG elevation; denervation, deafferentation, and β-blockers suppress the effect, demonstrating that S6K signals from liver to adipose via afferent vagal and efferent sympathetic nerves.\",\n      \"method\": \"Hepatic SNAT2/Rheb/active-S6K/DN-S6K viral expression, serum TG measurement, adipose LPL activity, surgical denervation, pharmacological deafferentation, β-blocker administration\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — dominant-negative and constitutively active S6K with multiple genetic/pharmacological interventions; neuronal pathway established by surgical and pharmacological denervation\",\n      \"pmids\": [\"26268630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The 17q23 gene PS6K (RPS6KB1) is amplified in breast cancer; amplification is accompanied by corresponding increases in both mRNA and protein expression, localizing the gene to chromosome 17q23.\",\n      \"method\": \"Comparative genomic hybridization, FISH localization to 17q23, Northern blot, Western blot in breast tumor tissues and cell lines\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct gene amplification/expression measurement in tumors; multiple methods (CGH, Northern, Western); not mechanistic per se but establishes genomic amplification drives overexpression\",\n      \"pmids\": [\"10197603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In C. elegans, rsks-1/S6K promotes germline stem cell (GSC) fate cell-autonomously, acts in parallel with glp-1/Notch and daf-2/insulin-IGF receptor pathways, and requires a conserved TOR phosphorylation site; rsks-1 promotes cell cycle progression and inhibits differentiation in the germline progenitor pool.\",\n      \"method\": \"C. elegans rsks-1 null mutants, germline-specific rescue, double-mutant analysis with glp-1, daf-2, ife-1, let-363/TOR, daf-15/RAPTOR, TOR phosphorylation site mutant\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — systematic genetic epistasis with multiple pathway components, germline-autonomous rescue, conserved phosphorylation site required\",\n      \"pmids\": [\"22278922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Overexpression of constitutively active S6K in pancreatic β-cells improves insulin secretion but reduces β-cell mass by impairing G1-S cell cycle progression (increased p16, p27; decreased Cdk2) and increasing apoptosis. This is accompanied by downregulated IRS/Akt signaling, establishing that in vivo S6K activation creates β-cell insulin resistance via IRS negative feedback.\",\n      \"method\": \"Transgenic mice with rat insulin promoter-driven constitutively active S6K, β-cell mass and proliferation analysis, cell cycle marker Western blot, IRS/Akt phosphorylation, insulin secretion assay\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo transgenic mouse model with defined molecular pathway (IRS/Akt downregulation) and multiple cellular phenotypes (cell cycle, apoptosis, secretion)\",\n      \"pmids\": [\"20622167\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RPS6KB1 (S6K1) is a serine/threonine kinase activated downstream of mTORC1 by sequential phosphorylation: mTOR phosphorylates T389 in the hydrophobic motif, which creates a docking site for the PDK1 PIF-binding pocket, enabling PDK1 to phosphorylate T229 in the activation loop; prior phosphorylation of the carboxyl-terminal autoinhibitory S/TP sites relieves intrasteric inhibition to facilitate these events. Once active, S6K1 phosphorylates the 40S ribosomal protein S6 to promote 5'TOP mRNA translation and ribosome biogenesis, phosphorylates eIF4B (S422) to enhance translation initiation, and phosphorylates IRS1/2 to create a negative feedback loop that attenuates insulin/IGF-1 signaling through PI3K-Akt; it also phosphorylates RNF168 (S60) to modulate DNA damage response, interacts with STING in a cGAS/TBK1-dependent manner to promote IRF3 activation, is dephosphorylated by the PP2A-B'/PPP2R5C holoenzyme, associates with the actin cytoskeleton and localizes to the leading-edge actin arc to regulate cell migration, and modulates lysosome morphology and NF-κB-mediated inflammaging via Syntaxin 13.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RPS6KB1 (p70 S6K1) is a serine/threonine kinase that operates downstream of mTOR to couple nutrient and growth-factor signaling to ribosome biogenesis, mRNA translation, and cell/organism growth [#0, #4, #18]. Its activation is built on an ordered, intrasteric mechanism: phosphorylation of the C-terminal autoinhibitory S/TP sites relieves an amino-terminal constraint and cooperates with rapamycin-sensitive phosphorylation of the T389 hydrophobic-motif site, which in turn creates a docking interaction with the PIF-binding pocket of PDK1 to permit T229 activation-loop phosphorylation [#0, #1, #2]. Inputs upstream of this cascade include amino-acid/tRNA-aminoacylation status acting through mTOR [#6], distinct PDK1-dependent leucine versus insulin routes [#21], and H2O2/Ca2+-mediated activation [#16]; the kinase is reset by direct dephosphorylation through the PP2A-B'/PPP2R5C holoenzyme [#8]. Genetically, S6K1 specifically controls ribosomal protein (5'TOP) mRNA translation and S6 phosphorylation, with loss buffered by the homolog S6K2 [#3, #4]. Active S6K1 phosphorylates eIF4B at Ser422 to enhance translation initiation [#12] and drives degradation of the translational repressor PDCD4 to relieve eIF4A inhibition [#17], while phosphorylating IRS1/2 to impose negative feedback that attenuates insulin/IGF-1–PI3K-Akt signaling—a circuit that links mTOR hyperactivation to insulin resistance and β-cell dysfunction [#7, #28, #22]. Beyond translation, S6K1 phosphorylates RNF168 at Ser60 to suppress its E3 ligase activity and dampen the DNA-damage response [#9], forms a cGAS/TBK1-dependent S6K1–STING–TBK1 complex required for IRF3-driven antiviral gene expression [#10], associates with the F-actin cytoskeleton at the leading-edge actin arc to support migration [#11], and—via Syntaxin 13—regulates lysosome morphology and NF-κB–mediated inflammaging [#24]. Amplification of RPS6KB1 at 17q23 drives its overexpression in breast cancer [#26].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established the regulatory architecture of S6K activation by defining T389 as the principal rapamycin-sensitive site that governs activation-loop T229 phosphorylation through an intrasteric mechanism gated by the C-terminal autoinhibitory domain.\",\n      \"evidence\": \"Truncation and point mutagenesis with kinase assays and multiple inhibitors (rapamycin, wortmannin)\",\n      \"pmids\": [\"8887654\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the physiological kinases acting on T389 or T229\", \"Intrasteric model inferred from mutants rather than structure\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Resolved the order of activation by showing C-terminal S/TP phosphorylation relieves N-terminal autoinhibition and, with T389, converts S6K into a competent PDK1 substrate at the activation loop.\",\n      \"evidence\": \"Acidic-substitution mutants and in vitro PDK1 phosphorylation/kinase assays\",\n      \"pmids\": [\"9614086\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro reconstitution; cellular kinetics of site phosphorylation not resolved\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Demonstrated in vivo that S6K1 specifically controls ribosomal S6 phosphorylation and 5'TOP mRNA translation, dissecting this branch from rapamycin's effects on 4E-BP1 and general translation, and revealed compensation by the S6K2 homolog.\",\n      \"evidence\": \"Gene knockout in mice and ES cells with polysome profiling and S6 phosphorylation assays\",\n      \"pmids\": [\"9822608\", \"9560223\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Redundancy with S6K2 obscures full loss-of-function phenotype\", \"Direct S6 phosphorylation by S6K1 inferred from genetic readout\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Connected S6K activity to developmental and physiological translational programs, showing it both promotes 5'TOP and suppresses non-5'TOP mRNA translation and correlates with muscle hypertrophy.\",\n      \"evidence\": \"Xenopus oocyte injection of constitutively active mutant with reporters; rat resistance-exercise model with kinase and polysome assays\",\n      \"pmids\": [\"10082514\", \"9886927\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Muscle data correlative\", \"Mechanism of selective non-5'TOP repression unresolved\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identified upstream inputs to S6K beyond classical growth factors: amino-acid/tRNA aminoacylation status through mTOR and H2O2/Ca2+-dependent activation upstream of PI3K and mTOR.\",\n      \"evidence\": \"tRNA-synthetase mutant and aminoacylation inhibitors with rapamycin-resistant mTOR; glucose oxidase/catalase and Ca2+ chelation with kinase assays\",\n      \"pmids\": [\"9873056\", \"10551813\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular sensor linking deacylated tRNA or ROS to mTOR not identified\", \"ROS pathway placement inferred from inhibitor hierarchy\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the PDK1 PIF-binding pocket as the structural determinant required for S6K (and SGK1) but not Akt activation, mechanistically linking T389 docking to T-loop phosphorylation.\",\n      \"evidence\": \"PDK1 pocket mutants, co-IP, and comparative in vitro kinase assays across substrates\",\n      \"pmids\": [\"11500365\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural detail of the docking interaction not obtained in this study\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Confirmed in vivo that PDK1 routes insulin/growth signaling to organismal growth through two parallel branches, Akt and S6K.\",\n      \"evidence\": \"Drosophila genetic epistasis with dPDK1 loss/gain of function and substrate activity measurements\",\n      \"pmids\": [\"11752451\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Branch-specific contributions to growth not quantitatively separated\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Established S6K-mediated negative feedback on IRS1/2 as the mechanism linking mTOR hyperactivation to insulin resistance, decoupling Akt from IRS-dependent growth-factor inputs.\",\n      \"evidence\": \"TSC1/TSC2 deletion and Rheb overexpression with IRS1/2 and Akt phosphorylation assays\",\n      \"pmids\": [\"15380067\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct IRS phosphorylation sites by S6K not mapped in this study\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Extended S6K function beyond catalysis to localization and non-substrate partnerships, placing S6K at the actin arc with mTOR/Akt/PDK1 in migration and identifying CoA synthase and the PDK1-PILSAP complex as physical associations.\",\n      \"evidence\": \"F-actin cosedimentation and immunocytochemistry with rapamycin; reciprocal co-IP/BIAcore; dominant-negative PILSAP with in vivo angiogenesis\",\n      \"pmids\": [\"15149849\", \"15589845\", \"15187024\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of CoA synthase binding unclear\", \"Actin-localization study from a single lab\", \"How PILSAP-processed PDK1 selects S6K not fully resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified eIF4B Ser422 as a direct S6K1 substrate that enhances eIF3A association and ATPase activity, defining a translation-initiation effector required for interferon-dependent protein expression.\",\n      \"evidence\": \"S6k1/S6k2 double-KO MEFs, eIF4B phosphorylation, eIF3A co-IP, and ATPase assays\",\n      \"pmids\": [\"19289497\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of S6K1 vs S6K2 to eIF4B phosphorylation not isolated\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the off-switch for S6K by identifying the PP2A-B'/PPP2R5C holoenzyme as a conserved direct phosphatase counteracting S6K phosphorylation.\",\n      \"evidence\": \"PP2A-B' knockout Drosophila, co-IP, and PPP2R5C knockdown in human cells\",\n      \"pmids\": [\"20444422\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific S6K residues dephosphorylated by PP2A-B' not mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrated that S6K hyperactivation, not basal activity, is detrimental across stem-cell and tissue contexts, linking S6K-driven translation to loss of pluripotency, β-cell dysfunction, and stem-cell loss.\",\n      \"evidence\": \"Constitutively active S6K in hESCs; transgenic active-S6K β-cells; Drosophila TSC1/2-S6K intestinal stem-cell epistasis\",\n      \"pmids\": [\"20698768\", \"20622167\", \"23843608\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"β-cell phenotype tied to IRS/Akt feedback but direct targets not all defined\", \"hESC study single lab\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed therapeutically that relieving S6K-imposed feedback on the PDK1-Akt axis underlies cardioprotection by S6K inhibition.\",\n      \"evidence\": \"Rapamycin/PF-4708671 in MI model with cardiomyocyte-specific PDK1 and Akt1/3 knockouts\",\n      \"pmids\": [\"21906027\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether feedback operates via IRS or other adaptors in heart not specified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established cell-autonomous S6K control of stem-cell fate, with S6K promoting germline progenitor proliferation in parallel to Notch and insulin/IGF pathways via a conserved TOR phosphorylation site.\",\n      \"evidence\": \"C. elegans rsks-1 genetic epistasis with germline-autonomous rescue\",\n      \"pmids\": [\"22278922\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream translational targets driving GSC fate not identified\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Revealed an inter-tissue role: hepatic amino-acid/mTORC1/S6K signaling controls systemic lipid metabolism through afferent vagal and efferent sympathetic neuronal relays.\",\n      \"evidence\": \"Hepatic active/dominant-negative S6K viral expression with surgical denervation, deafferentation, and β-blockers\",\n      \"pmids\": [\"26268630\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular signal from liver to nerve not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified creatine kinase (ARGK-1) as a longevity effector downstream of S6K loss, linking reduced S6K to AMPK activation and extended lifespan.\",\n      \"evidence\": \"C. elegans rsks-1 proteomics, ARGK-1 overexpression lifespan/AMPK epistasis, and S6K1-KO mouse brain measurement\",\n      \"pmids\": [\"26923601\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How S6K loss elevates ARGK-1 not mechanistically defined\", \"Lifespan link extrapolated from invertebrate to mouse only at protein-level\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Expanded S6K into innate immunity by showing its kinase domain (not activity) scaffolds a cGAS/TBK1-dependent S6K1-STING-TBK1 complex required for IRF3 activation and antiviral responses.\",\n      \"evidence\": \"Reciprocal co-IP, kinase-dead and domain mutants, cGAS-deficient cells, TBK1 depletion, and in vivo antiviral assays\",\n      \"pmids\": [\"27043414\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of S6K1-STING contact not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Connected S6K to genome maintenance by identifying RNF168 Ser60 as a direct substrate whose phosphorylation inhibits ligase activity and promotes proteolysis, impairing the DNA-damage response.\",\n      \"evidence\": \"Phosphosite mapping, ligase and stability assays, and phospho-deficient RNF168-S60A rescue in Lkb1-null tumors\",\n      \"pmids\": [\"29403037\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of this DDR effect across tissues beyond LKB1-loss context not established\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed mitotic suppression of mTORC1-S6K stabilizes PDCD4 to repress eIF4A, defining an S6K/PDCD4/eIF4A axis that governs cell fate during mitotic arrest and chemosensitivity.\",\n      \"evidence\": \"Non-phosphorylatable raptor mutant, PDCD4 stability assays, eIF4A inhibition, and Taxol-sensitivity readouts\",\n      \"pmids\": [\"33027666\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct S6K phosphorylation site on PDCD4 not mapped here\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked TORC1-S6K to organelle homeostasis and aging, identifying Syntaxin 13 as the mediator of S6K-dependent lysosome morphology and NF-κB-mediated inflammaging.\",\n      \"evidence\": \"Drosophila fat-body S6K epistasis with Syntaxin 13 and lysosome/IMD readouts; conservation via mouse liver rapamycin and NF-κB measurement\",\n      \"pmids\": [\"38413780\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether S6K directly phosphorylates Syntaxin 13 unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How S6K1 substrate selection is spatially partitioned among translation, DNA-damage, innate-immune, cytoskeletal, and organelle pathways—and which scaffolds or localizations direct each output—remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model of how one kinase coordinates distinct effector branches\", \"Structural basis for non-catalytic scaffolding (e.g. STING) not determined\", \"Direct phosphosites on several effectors (IRS, PDCD4, Syntaxin 13) not all mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 9, 12, 17]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 1, 2, 12]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [4, 12, 17]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4, 12, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 7, 21, 22]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [10, 12]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [25, 7]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [18, 27, 20]}\n    ],\n    \"complexes\": [\n      \"S6K1-STING-TBK1 complex\",\n      \"PDK1-PILSAP complex\"\n    ],\n    \"partners\": [\n      \"PDK1\",\n      \"STING1\",\n      \"TBK1\",\n      \"PPP2R5C\",\n      \"EIF4B\",\n      \"EIF3A\",\n      \"RNF168\",\n      \"STX12\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}