{"gene":"STK24","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":1997,"finding":"MST3 (mst-3) was cloned and characterized as a serine/threonine kinase that phosphorylates basic exogenous substrates and itself in vitro, preferring Mn2+ over Mg2+ as a divalent cation cofactor and able to use both GTP and ATP as phosphate donors; activation occurs by autophosphorylation.","method":"In vitro kinase assay, biochemical characterization of purified recombinant protein","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct in vitro enzymatic characterization with multiple biochemical readouts in the cloning paper; replicated in structural studies","pmids":["9353338"],"is_preprint":false},{"year":2000,"finding":"A brain-specific isoform of MST3, termed MST3b (encoded by STK24), was identified with expression restricted to brain. MST3b is phosphorylated by cAMP-dependent protein kinase (PKA) at Thr-18, a site absent in MST3, and mutation T18A abolishes PKA phosphorylation and partially activates p42/44 MAPK, whereas MST3 (but not MST3b) activates p42/44 MAPK up to 4-fold.","method":"Northern blot, Western blot, in vivo and in vitro PKA phosphorylation assay, site-directed mutagenesis (T18A), co-transfection in HEK293 cells","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro and in vivo phosphorylation assays with mutagenesis in a single lab; multiple orthogonal methods","pmids":["10644707"],"is_preprint":false},{"year":2002,"finding":"MST3 (Mst3) is specifically cleaved by caspase (at AETD313) during Fas- or staurosporine-induced apoptosis in Jurkat cells. Caspase-mediated removal of the C-terminal regulatory domain activates intrinsic kinase activity and promotes nuclear translocation. Kinase activity is required for apoptotic effects; catalytically inactive Mst3 does not induce DNA fragmentation.","method":"Anti-Fas antibody and staurosporine treatment of Jurkat cells, caspase inhibitor (Ac-DEVD-CHO), recombinant caspase assay, site-directed mutagenesis of cleavage site, overexpression of WT vs. kinase-dead Mst3, TUNEL/morphology assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro caspase cleavage, mutagenesis of cleavage site, gain/loss-of-function with multiple orthogonal readouts in a single rigorous study","pmids":["12107159"],"is_preprint":false},{"year":2004,"finding":"MST3 (Mst3) contains a bipartite-like nuclear localization sequence (NLS) at residues 278–292 (C-terminus of kinase domain) and nuclear export signals in the regulatory domain (residues 335–386). Removal of the NLS leads to cytoplasmic accumulation, while deletion of NES or leptomycin B treatment leads to nuclear accumulation.","method":"EGFP-fusion protein serial deletions, leptomycin B treatment, fluorescence microscopy","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct localization experiments with deletion mutants and inhibitor treatment; single lab, two orthogonal approaches","pmids":["15304321"],"is_preprint":false},{"year":2005,"finding":"MST3 phosphorylates NDR1/NDR2 protein kinase at the hydrophobic motif site Thr444/Thr442 in vitro, resulting in ~10-fold stimulation of NDR activity. In vivo, kinase-dead MST3 (MST3KR) potently inhibits Thr442 phosphorylation after okadaic acid stimulation, and shRNA knockdown of MST3 abolishes hydrophobic motif phosphorylation of NDR in HEK293F cells.","method":"In vitro kinase assay, shRNA knockdown, dominant-negative (MST3KR) overexpression, phospho-specific antibody detection in HEK293F cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay plus in-cell loss-of-function with multiple orthogonal methods; well-controlled study","pmids":["16314523"],"is_preprint":false},{"year":2006,"finding":"MST3 inhibits cell migration in MCF-7 cells; siRNA suppression of MST3 enhances migration and reduces E-cadherin at migrating cell edges. Autophosphorylation at Thr178 is required for kinase activity; T178A mutant lacks autophosphorylation and kinase activity and fails to inhibit migration. MST3 phosphorylates PTP-PEST and inhibits its tyrosine phosphatase activity, thereby modulating paxillin phosphorylation at Y118 and Y31.","method":"siRNA knockdown, RNAi-resistant rescue, in vitro kinase assay, site-directed mutagenesis (T178A), paxillin phospho-specific antibodies, PTP-PEST phosphatase activity assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro biochemistry with mutagenesis, cell-based loss-of-function rescue, and substrate phosphatase activity assay; multiple orthogonal methods","pmids":["17046825"],"is_preprint":false},{"year":2009,"finding":"Mst3b (encoded by Stk24) mediates axon-promoting effects of trophic factors in retinal ganglion cells (RGCs) and dorsal root ganglion (DRG) neurons. shRNA knockdown of Mst3b prevents trophic-factor-induced axon regeneration; kinase-dead Mst3b blocks axon extension; constitutively active Mst3b enables axon growth without growth factors. In vivo, Mst3b-deficient RGCs fail to regenerate axons after optic nerve crush with intraocular inflammation, and Mst3b knockdown attenuates DRG axon regeneration and p42/44 MAPK activation.","method":"shRNA knockdown, kinase-dead and constitutively active mutant expression, in vitro neurite outgrowth assay, in vivo optic nerve crush model, p42/44 MAPK immunoblotting","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain- and loss-of-function in both in vitro and in vivo models with defined pathway readout (p42/44 MAPK); multiple approaches","pmids":["19855390"],"is_preprint":false},{"year":2006,"finding":"Mst3b (STK24 isoform) is activated in response to trophic factors and by the purine nucleoside inosine (an axon growth promoter), while 6-thioguanine (a purine analog that blocks axon outgrowth) inhibits Mst3b kinase activity. siRNA suppression or dominant-negative expression of Mst3b blocks axon outgrowth in embryonic cortical neurons.","method":"In vitro kinase assay with inosine/6-thioguanine, siRNA knockdown, dominant-negative mutant expression, neurite outgrowth assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase activity measurement, cellular loss-of-function, and direct small-molecule modulation of kinase; single lab with multiple orthogonal methods","pmids":["17114295"],"is_preprint":false},{"year":2010,"finding":"Crystal structures of human MST3 catalytic domain (residues 19–289) were solved in complexes with ADP and Mn2+, and with adenine alone. The structures show that Mn2+ is coordinated by Asn149 and Asp162, and that phosphorylation of Thr178 in the activation loop (sandwiched by Arg143 and Arg176) is associated with a 180° loop rotation leading to kinase activation.","method":"X-ray crystallography (multiple crystal structures)","journal":"Acta crystallographica. Section D, Biological crystallography","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with multiple ligand-bound states in one study; structurally confirms Mn2+ preference and activation loop phosphorylation mechanism","pmids":["20124694"],"is_preprint":false},{"year":2011,"finding":"MO25α and MO25β bind to MST3 (and MST4/YSK1) and stimulate MST3 kinase activity ~3–4-fold. siRNA-mediated reduction of MO25 in cells inhibits downstream signaling, rescued by re-expression of MO25α.","method":"Co-immunoprecipitation, in vitro kinase assay, siRNA knockdown, rescue experiment","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP plus in vitro activity assay and cellular siRNA rescue; replicated across multiple STE20 family members with consistent mechanism","pmids":["21423148"],"is_preprint":false},{"year":2011,"finding":"Striatin scaffolds MST3 and recruits PP2A to regulate MST3 phosphorylation and activity. PP2A binds the coiled-coil/oligomerization domain of striatin (requiring its caveolin-binding domain for oligomerization), while MST3 associates with striatin residues 191–344 likely as a dimer with CCM3. Point mutations in striatin that disrupt PP2A binding cause hyperphosphorylation and activation of striatin-associated MST3 via autophosphorylation of multiple activation loop sites.","method":"Co-immunoprecipitation, point mutagenesis, structure-function deletion analysis, phosphorylation state analysis","journal":"BMC biochemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and mutagenesis mapping of binding sites with functional phosphorylation readout; single lab but multiple orthogonal methods","pmids":["21985334"],"is_preprint":false},{"year":2012,"finding":"A non-canonical pathway of MST3 activation involves dephosphorylation: inactive MST3 co-immunoprecipitates with Golgi protein GOLGA2/GM130 in basal state. Phosphatase inhibition (calyculin A) triggers autophosphorylation of MST3 at both Thr178 (activation loop, increases kinase activity) and Thr328 (regulatory domain, requires residues 341–376 as a docking domain). Thr328 phosphorylation is necessary for MST3 to associate with MO25 and for MST3 dissociation from GM130.","method":"Co-immunoprecipitation, calyculin A treatment, site-directed mutagenesis, in vitro kinase assay, phospho-specific antibodies","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro kinase assay with mutagenesis, co-IP for binding partners, and calyculin A pharmacological dissection; multiple orthogonal methods in single lab","pmids":["22229648"],"is_preprint":false},{"year":2013,"finding":"Crystal structure of MST3 catalytic domain (residues 19–289) in complex with full-length MO25β reveals an intricate interface stabilizing MST3 in a closed, active conformation. Interface residues Tyr223 of MO25β and Glu58 and Ile71 of MST3, when mutated, prevent MST3 activation by MO25β. The MO25β binding mode is analogous to MO25α interaction with pseudokinase STRADα.","method":"X-ray crystallography, site-directed mutagenesis (Y223, E58, I71), in vitro kinase activity assay","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with mutagenesis validation of interface residues; rigorous structural study with functional follow-up","pmids":["23296203"],"is_preprint":false},{"year":2014,"finding":"MST3 kinase activity is essential for dendritic filopodia, spine synapse, and excitatory synapse development in hippocampal neurons. Chemical-genetic substrate trapping identified 13 MST3 substrates; TAO1/2 kinases were validated substrates whose phosphorylation by MST3 is required for Myosin Va dendritic localization and spine development.","method":"shRNA knockdown, kinase-dead MST3 expression, in utero electroporation (spine density in vivo), chemical genetics (analog-sensitive kinase), SILAC-based substrate identification, phospho-site mapping","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — chemical genetics plus SILAC for substrate ID, in vitro/in vivo phosphorylation, in utero electroporation for in vivo phenotype; multiple rigorous orthogonal methods","pmids":["25456499"],"is_preprint":false},{"year":2014,"finding":"MST3 regulates radial neuronal migration in the developing neocortex. Mst3 silencing (in utero electroporation) perturbs multipolar-to-bipolar transition of migrating neurons. Kinase activity of MST3 is required for this function and is regulated by Cdk5 phosphorylation of MST3 at Ser79. MST3 phosphorylates RhoA at Ser26, thereby negatively regulating RhoA GTPase activity; RhoA knockdown rescues migration defects caused by Mst3 knockdown.","method":"In utero electroporation (shRNA), in vitro kinase assay, Cdk5 phosphorylation assay (Ser79 mutagenesis), RhoA-GTP pulldown assay, rescue epistasis (RhoA knockdown)","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vivo loss-of-function, in vitro substrate phosphorylation with mutagenesis, and genetic epistasis rescue; multiple orthogonal methods","pmids":["24872548"],"is_preprint":false},{"year":2016,"finding":"MST3 promotes proliferation and tumorigenicity in breast cancer through interaction with VAV2 via a proline-rich region (353KDIPKRP359) of MST3 binding the SH3 domain of VAV2. This interaction leads to VAV2 phosphorylation and Rac1 (GTP-Rac1) activation, cyclin D1 expression, and increased cell growth; mutation of the proline-rich domain (ΔP-MST3) abolishes VAV2 interaction and oncogenic effects.","method":"Co-immunoprecipitation, confocal microscopy co-localization, domain mapping mutagenesis, GTP-Rac1 pulldown assay, shRNA knockdown, soft agar growth assay, xenograft tumor formation","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, domain-level mutagenesis of interaction, downstream Rac1-GTP pulldown, in vitro and in vivo tumor assays; multiple orthogonal methods","pmids":["26910843"],"is_preprint":false},{"year":2017,"finding":"MST3/STK24 inhibits the insulin signaling pathway: MST3 knockout mice on a high-fat diet show reduced hyperglycemia, hyperinsulinemia, and insulin resistance. Lack of MST3 activates insulin signaling downstream of IRS1, increases FOXO1 inhibition, and downregulates gluconeogenic enzyme expression. Mst3 is phosphorylated in livers of mice on an obesity-promoting diet.","method":"Mst3 knockout mice (HFD model), RNAi in human liver cells, insulin signaling pathway immunoblotting (phospho-IRS1, Akt, FOXO1), gluconeogenic gene expression analysis","journal":"Diabetologia","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout mouse model with in vivo metabolic phenotype, corroborated by RNAi in human cells with defined signaling pathway readouts; two orthogonal systems","pmids":["28956081"],"is_preprint":false},{"year":2019,"finding":"MST3 protein coats lipid droplets in mouse and human hepatocytes. MST3 knockdown attenuates lipid accumulation by stimulating β-oxidation and triacylglycerol secretion while inhibiting fatty acid influx and lipid synthesis; mechanistically, lipogenic gene expression and acetyl-CoA carboxylase protein abundance are reduced in MST3-deficient hepatocytes.","method":"siRNA knockdown in human hepatocytes, lipid droplet imaging/co-localization, β-oxidation assay, lipid secretion assay, fatty acid uptake assay, gene expression analysis","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct subcellular localization to lipid droplets, multiple lipid metabolic flux assays, mechanistic gene expression readouts; single lab with multiple orthogonal functional methods","pmids":["31173506"],"is_preprint":false},{"year":2021,"finding":"In vivo antisense oligonucleotide (ASO)-mediated silencing of Mst3 in obese mice ameliorates NAFLD (steatosis, inflammation, fibrosis). Mst3 ASOs suppress lipogenic gene expression and ACC protein abundance, and reduce lipotoxicity-mediated oxidative and ER stress in liver.","method":"Antisense oligonucleotide treatment in HFD mouse model, liver histology, gene expression analysis, ACC protein immunoblotting, oxidative/ER stress markers","journal":"FASEB journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo loss-of-function with ASOs, multiple histological and biochemical endpoints; confirms and extends previous in vitro findings","pmids":["33891332"],"is_preprint":false},{"year":2016,"finding":"Phosphorylation site specificity of MST3/STK24 was defined by peptide arrays; structure-guided mutagenesis identified β3-αC loop residues in the catalytic cleft as specificity determinants. Exchanging key residues between MST4 and PAK4 could largely interconvert their phosphorylation site preferences and downstream signaling (Hippo vs. actin remodeling), demonstrating that catalytic site specificity is necessary and sufficient for distinct signaling outputs.","method":"Peptide array (phosphorylation site profiling), structure-guided mutagenesis, cell-based signaling assays (Hippo pathway, actin remodeling readouts)","journal":"PLoS biology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — peptide array plus mutagenesis and cell-based signaling; mechanistic claims about MST3/STK24 specificity are part of a broader STE20 family study","pmids":["30897078"],"is_preprint":false},{"year":2010,"finding":"STK24 (MST3/STK24) was identified as a novel substrate and interacting protein of LRRK2 kinase by protein microarray. LRRK2 phosphorylates STK24 in vitro.","method":"Protein microarray with 260 signal transduction proteins, in vitro kinase assay","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single protein microarray experiment, no reciprocal validation or mutagenesis; identification is suggestive only","pmids":["20949042"],"is_preprint":false},{"year":2008,"finding":"MST3 trophoblast apoptosis: MST3 expression is induced by oxidative stress (H2O2) in human trophoblasts. Overexpression of kinase-dead MST3KR or shRNA knockdown of MST3 suppresses H2O2-induced apoptosis. JNK participates upstream of Mst3 in this pathway, and caspase 3 and downstream apoptotic components are activated by Mst3.","method":"shRNA knockdown, kinase-dead (MST3KR) overexpression, JNK inhibitor, caspase inhibitor, apoptosis assays in 3A-sub-E trophoblast cell line","journal":"Apoptosis","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — loss-of-function with shRNA plus kinase-dead dominant negative; pathway ordering by inhibitor epistasis; single lab","pmids":["18040775"],"is_preprint":false},{"year":2009,"finding":"MST3 triggers a caspase-independent apoptotic pathway: Mst3 knockdown reduces staurosporine-induced apoptosis by ~65%; Mst3 is required for mitochondrial membrane potential transition (Bax regulation), and for nuclear translocation of apoptosis-inducing factor (AIF) and endonuclease G (EndoG), as well as EndoG nuclease activity.","method":"Stable shRNA knockdown clones, mitochondrial membrane potential assay (JC-1), AIF/EndoG nuclear translocation by immunofluorescence, nuclease activity assay, caspase inhibitor (z-DEVD-fmk)","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — cellular loss-of-function with multiple orthogonal mechanistic readouts; single lab study","pmids":["19782762"],"is_preprint":false}],"current_model":"STK24 (MST3/Mst3b) is a serine/threonine kinase of the GCK-III subfamily that is activated by autophosphorylation at Thr178 (with Mn2+ as preferred cofactor), allosterically stimulated ~3–4-fold by MO25 scaffolding proteins (via a defined interface stabilizing the active conformation), and negatively regulated by striatin-anchored PP2A; in response to apoptotic stimuli, caspase cleaves MST3 at AETD313, releasing the catalytic domain from C-terminal inhibition and driving nuclear translocation; activated MST3 phosphorylates NDR kinases at their hydrophobic motif (Thr442/444), TAO1/2 kinases to enable Myosin Va-dependent spine synapse development, RhoA at Ser26 to inhibit GTPase activity and control neuronal migration (downstream of Cdk5-mediated phosphorylation at Ser79), PTP-PEST to modulate paxillin phosphorylation and suppress cell migration, and VAV2 to activate Rac1 signaling; Mst3b isoform additionally mediates trophic-factor- and purine-dependent axon regeneration in CNS and PNS neurons, and MST3 localizes to intracellular lipid droplets where it promotes hepatic lipogenesis and inhibits fatty acid oxidation, contributing to insulin resistance and NAFLD."},"narrative":{"mechanistic_narrative":"STK24 (MST3/Mst3b) is a GCK-III subfamily serine/threonine kinase that integrates apoptotic, neurodevelopmental, and hepatic metabolic signaling through phosphorylation of distinct substrate sets [PMID:9353338, PMID:25456499, PMID:24872548]. Its catalytic output depends on autophosphorylation of the activation-loop residue Thr178, with Mn2+ as the preferred cofactor; crystal structures show that Thr178 phosphorylation, coordinated by Arg143/Arg176, drives an activation-loop rotation that switches the kinase to its active conformation [PMID:9353338, PMID:17046825, PMID:20124694]. Kinase activity is allosterically amplified ~3-4-fold by the MO25alpha/beta scaffolds, which dock through a defined interface (MO25beta Tyr223 with MST3 Glu58/Ile71) that locks MST3 in a closed, active state, and is held in check by a striatin-anchored PP2A whose disruption causes MST3 hyperphosphorylation [PMID:21423148, PMID:23296203, PMID:21985334]. Activation can also proceed non-canonically by dephosphorylation-triggered autophosphorylation at Thr178 and the regulatory-domain site Thr328, the latter licensing MO25 association and release from a basal GM130/GOLGA2 pool [PMID:22229648]. During Fas- or staurosporine-induced apoptosis, caspase cleavage at AETD313 removes the C-terminal regulatory domain, activating the catalytic core and driving nuclear translocation via an NLS otherwise opposed by a regulatory-domain NES [PMID:12107159, PMID:15304321]. As an effector kinase, MST3 phosphorylates NDR1/2 at their hydrophobic motif (Thr442/444) to stimulate NDR activity, TAO1/2 kinases to direct Myosin Va-dependent dendritic spine and synapse development, RhoA at Ser26 to suppress its GTPase activity and control radial neuronal migration downstream of Cdk5-mediated Ser79 phosphorylation, and PTP-PEST to modulate paxillin phosphorylation and inhibit cell migration [PMID:16314523, PMID:25456499, PMID:24872548, PMID:17046825]. Through a proline-rich motif engaging the VAV2 SH3 domain, MST3 activates VAV2-Rac1 signaling to promote breast cancer proliferation and tumorigenicity [PMID:26910843]. The brain-restricted Mst3b isoform, distinguished by a PKA site at Thr18, mediates trophic-factor- and purine-dependent axon regeneration in CNS and PNS neurons [PMID:10644707, PMID:19855390, PMID:17114295]. MST3 also coats hepatic lipid droplets, where it promotes lipogenesis and acetyl-CoA carboxylase abundance while suppressing fatty acid oxidation, and its loss in mice protects against insulin resistance and NAFLD [PMID:31173506, PMID:28956081, PMID:33891332].","teleology":[{"year":1997,"claim":"Established STK24 as an autoactivating serine/threonine kinase, defining the basic enzymatic identity and its unusual Mn2+ and GTP/ATP usage.","evidence":"In vitro kinase assays on purified recombinant MST3","pmids":["9353338"],"confidence":"High","gaps":["No physiological substrates identified","Cellular regulation of autophosphorylation unknown"]},{"year":2000,"claim":"Identified a brain-specific MST3b isoform with a unique PKA phosphorylation site (Thr18), revealing isoform-specific regulation and differential MAPK coupling.","evidence":"Northern/Western blots, PKA phosphorylation and T18A mutagenesis in HEK293","pmids":["10644707"],"confidence":"High","gaps":["Functional consequence of Thr18 phosphorylation in neurons not defined","Mechanism of differential MAPK activation unclear"]},{"year":2002,"claim":"Showed that caspase cleavage at AETD313 removes C-terminal autoinhibition to activate MST3 and drive nuclear translocation during apoptosis, linking the kinase to programmed cell death.","evidence":"Fas/staurosporine treatment, recombinant caspase cleavage, cleavage-site and kinase-dead mutagenesis in Jurkat cells","pmids":["12107159"],"confidence":"High","gaps":["Nuclear substrates of cleaved MST3 not identified","Physiological apoptotic contexts beyond cell lines unclear"]},{"year":2004,"claim":"Mapped the NLS and NES governing MST3 shuttling, explaining how regulatory-domain signals control nuclear access.","evidence":"EGFP-fusion deletions and leptomycin B in fluorescence microscopy","pmids":["15304321"],"confidence":"Medium","gaps":["Signals controlling shuttling in physiological conditions not defined","Single-lab localization study without endogenous validation"]},{"year":2005,"claim":"Identified NDR1/2 as direct MST3 substrates at their hydrophobic motif, placing MST3 upstream of NDR kinase activation.","evidence":"In vitro kinase assay, shRNA knockdown and dominant-negative MST3 with phospho-specific antibodies in HEK293F","pmids":["16314523"],"confidence":"High","gaps":["Downstream NDR-dependent outputs in this context not defined","Conditions selecting NDR among substrates unknown"]},{"year":2006,"claim":"Defined Thr178 autophosphorylation as essential for activity and showed MST3 suppresses migration via PTP-PEST/paxillin, establishing a cytoskeletal-regulatory role.","evidence":"siRNA/rescue, T178A mutagenesis, PTP-PEST phosphatase and paxillin phospho-assays in MCF-7","pmids":["17046825"],"confidence":"High","gaps":["Direct PTP-PEST phosphosite not mapped","Relationship between migration suppression and later oncogenic role unresolved"]},{"year":2006,"claim":"Linked Mst3b activity to purine- and trophic-factor-driven axon outgrowth, with direct small-molecule modulation by inosine and 6-thioguanine.","evidence":"In vitro kinase assays with purines, siRNA/dominant-negative in cortical neuron outgrowth assays","pmids":["17114295"],"confidence":"High","gaps":["Direct purine-binding mechanism not established","Substrates mediating axon outgrowth not identified"]},{"year":2008,"claim":"Implicated MST3 in oxidative-stress-induced trophoblast apoptosis downstream of JNK and upstream of caspase-3.","evidence":"shRNA, kinase-dead overexpression, JNK/caspase inhibitor epistasis in trophoblast cells","pmids":["18040775"],"confidence":"Medium","gaps":["Direct MST3 substrates in this pathway unknown","Single cell-line model"]},{"year":2009,"claim":"Demonstrated Mst3b is required for trophic-factor-induced axon regeneration in vivo, validating its neuronal regenerative function.","evidence":"shRNA, kinase-dead/constitutively-active mutants, optic nerve crush and DRG regeneration with MAPK readout","pmids":["19855390"],"confidence":"High","gaps":["Direct substrates coupling Mst3b to MAPK not defined","Translational applicability to other injury models unclear"]},{"year":2009,"claim":"Showed MST3 drives a caspase-independent apoptotic arm via mitochondrial AIF/EndoG release, broadening its death-signaling repertoire.","evidence":"Stable shRNA, JC-1 membrane potential, AIF/EndoG translocation and nuclease assays","pmids":["19782762"],"confidence":"Medium","gaps":["Direct MST3 substrates upstream of mitochondrial events unknown","Relationship to caspase-cleavage pathway not reconciled"]},{"year":2010,"claim":"Resolved crystal structures defining Mn2+ coordination and the activation-loop rotation triggered by Thr178 phosphorylation, providing the structural basis of activation.","evidence":"X-ray crystallography of MST3 catalytic domain with ADP/Mn2+ and adenine","pmids":["20124694"],"confidence":"High","gaps":["Full-length regulatory-domain structure absent","Conformational dynamics in cells not captured"]},{"year":2010,"claim":"Reported LRRK2 as an in vitro kinase for STK24, raising a possible upstream regulatory link.","evidence":"Protein microarray screen and in vitro kinase assay","pmids":["20949042"],"confidence":"Low","gaps":["Single microarray without reciprocal validation or mutagenesis","Phosphosite and cellular relevance unestablished"]},{"year":2011,"claim":"Identified MO25alpha/beta as allosteric activators of MST3, establishing scaffold-driven control of kinase output.","evidence":"Reciprocal co-IP, in vitro kinase assay, siRNA/rescue","pmids":["21423148"],"confidence":"High","gaps":["Stoichiometry and dynamics in cells not defined","Substrate selection by MO25-bound MST3 unclear"]},{"year":2011,"claim":"Defined striatin-scaffolded PP2A as a negative regulator dephosphorylating MST3, completing an activator/inhibitor balance.","evidence":"Co-IP, point/deletion mutagenesis mapping with phosphorylation readouts","pmids":["21985334"],"confidence":"High","gaps":["Quantitative interplay with MO25 activation not resolved","In vivo relevance of the striatin-PP2A axis unknown"]},{"year":2012,"claim":"Revealed a dephosphorylation-triggered, two-site autophosphorylation mechanism (Thr178/Thr328) coupling release from GM130 to MO25 binding.","evidence":"Co-IP, calyculin A, site-directed mutagenesis, in vitro kinase assays","pmids":["22229648"],"confidence":"High","gaps":["Physiological trigger for the dephosphorylation step unknown","Functional consequence of GM130 sequestration undefined"]},{"year":2013,"claim":"Solved the MST3-MO25beta complex structure and validated interface residues required for allosteric activation.","evidence":"X-ray crystallography with Y223/E58/I71 mutagenesis and kinase assays","pmids":["23296203"],"confidence":"High","gaps":["Whether MO25 alters substrate specificity not addressed","Dynamics of complex assembly in cells unknown"]},{"year":2014,"claim":"Used chemical-genetic substrate trapping to identify TAO1/2 as MST3 substrates governing Myosin Va-dependent spine and synapse development.","evidence":"Analog-sensitive kinase, SILAC substrate ID, in utero electroporation, shRNA/kinase-dead","pmids":["25456499"],"confidence":"High","gaps":["Roles of the other identified substrates unexplored","TAO phosphosites linking to Myosin Va not fully mapped"]},{"year":2014,"claim":"Showed MST3 controls radial neuronal migration by phosphorylating RhoA at Ser26 downstream of Cdk5 Ser79 phosphorylation, with RhoA epistasis rescuing the phenotype.","evidence":"In utero electroporation, in vitro kinase/mutagenesis, RhoA-GTP pulldown, genetic rescue","pmids":["24872548"],"confidence":"High","gaps":["How Cdk5 input integrates with MO25/striatin regulation unclear","Other GTPase substrates not surveyed"]},{"year":2016,"claim":"Established an oncogenic MST3-VAV2-Rac1 axis through a proline-rich motif/SH3 interaction promoting breast cancer growth.","evidence":"Co-IP, domain mapping, GTP-Rac1 pulldown, soft agar and xenograft assays","pmids":["26910843"],"confidence":"High","gaps":["Reconciliation with MST3's migration-suppressive role unresolved","Whether catalytic activity vs scaffolding drives the effect unclear"]},{"year":2016,"claim":"Defined catalytic-cleft determinants of phosphosite specificity, showing site preference dictates distinct signaling outputs across the kinase family.","evidence":"Peptide arrays, structure-guided mutagenesis, cell-based signaling assays","pmids":["30897078"],"confidence":"Medium","gaps":["MST3-specific consensus not exhaustively validated","Part of a broader STE20 family study"]},{"year":2017,"claim":"Identified MST3 as a suppressor of insulin signaling, with knockout mice protected from diet-induced insulin resistance, linking the kinase to metabolic disease.","evidence":"Mst3 knockout HFD mice, RNAi in human liver cells, insulin pathway immunoblotting","pmids":["28956081"],"confidence":"High","gaps":["Direct MST3 substrates in the insulin pathway not identified","Tissue-specific contributions undefined"]},{"year":2019,"claim":"Localized MST3 to hepatic lipid droplets and showed it promotes lipogenesis while inhibiting beta-oxidation, defining a hepatic metabolic function.","evidence":"siRNA in human hepatocytes, lipid droplet imaging, beta-oxidation/secretion/uptake assays, gene expression","pmids":["31173506"],"confidence":"High","gaps":["Mechanism targeting MST3 to lipid droplets unknown","Kinase substrates controlling lipogenic genes not identified"]},{"year":2021,"claim":"Demonstrated therapeutic potential by showing ASO silencing of Mst3 ameliorates NAFLD in obese mice.","evidence":"ASO treatment in HFD mice, liver histology, ACC immunoblotting, stress markers","pmids":["33891332"],"confidence":"High","gaps":["Long-term safety and specificity of MST3 inhibition unknown","Direct molecular targets driving steatosis reduction undefined"]},{"year":null,"claim":"The unifying logic that selects which substrate set (apoptotic, neuronal, metabolic, oncogenic) MST3 acts on in a given cell remains unresolved, as does how scaffold (MO25/striatin), localization (GM130/lipid droplet), and upstream kinase inputs (Cdk5/PKA) are integrated.","evidence":"","pmids":[],"confidence":"High","gaps":["No integrated model linking regulatory inputs to substrate choice","Mechanism of lipid-droplet targeting unknown","Reconciliation of pro-apoptotic, pro-migratory-suppressive, and oncogenic roles missing"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,5,13,14,15]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,4,5,14]},{"term_id":"GO:0140657","term_label":"ATP-dependent 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experimental cellular physiology, biochemistry, and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/30537740","citation_count":30,"is_preprint":false},{"pmid":"22292086","id":"PMC_22292086","title":"Mammalian ste20-like kinase and SAV1 promote 3T3-L1 adipocyte differentiation by activation of PPARγ.","date":"2012","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22292086","citation_count":29,"is_preprint":false},{"pmid":"15304321","id":"PMC_15304321","title":"Identification and characterization of the nuclear import and export signals of the mammalian Ste20-like protein kinase 3.","date":"2004","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/15304321","citation_count":28,"is_preprint":false},{"pmid":"31173506","id":"PMC_31173506","title":"Protein kinase MST3 modulates lipid homeostasis in hepatocytes and correlates with nonalcoholic steatohepatitis in humans.","date":"2019","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/31173506","citation_count":27,"is_preprint":false},{"pmid":"33891332","id":"PMC_33891332","title":"Silencing of STE20-type kinase MST3 in mice with antisense oligonucleotide treatment ameliorates diet-induced nonalcoholic fatty liver disease.","date":"2021","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/33891332","citation_count":25,"is_preprint":false},{"pmid":"25650755","id":"PMC_25650755","title":"Mammalian Ste20-like kinase 4 promotes pituitary cell proliferation and survival under hypoxia.","date":"2015","source":"Molecular endocrinology (Baltimore, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/25650755","citation_count":25,"is_preprint":false},{"pmid":"18287541","id":"PMC_18287541","title":"Ste20-related protein kinase LOSK (SLK) controls microtubule radial array in interphase.","date":"2008","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/18287541","citation_count":25,"is_preprint":false},{"pmid":"10699464","id":"PMC_10699464","title":"Molecular cloning and characterization of a novel human STE20-like kinase, hSLK.","date":"2000","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/10699464","citation_count":25,"is_preprint":false},{"pmid":"28956081","id":"PMC_28956081","title":"The MST3/STK24 kinase mediates impaired fasting blood glucose after a high-fat diet.","date":"2017","source":"Diabetologia","url":"https://pubmed.ncbi.nlm.nih.gov/28956081","citation_count":24,"is_preprint":false},{"pmid":"27135311","id":"PMC_27135311","title":"Discovery of Diverse Small-Molecule Inhibitors of Mammalian Sterile20-like Kinase 3 (MST3).","date":"2016","source":"ChemMedChem","url":"https://pubmed.ncbi.nlm.nih.gov/27135311","citation_count":24,"is_preprint":false},{"pmid":"18985800","id":"PMC_18985800","title":"Ste20-related proline/alanine-rich kinase: a novel regulator of intestinal inflammation.","date":"2008","source":"World journal of gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/18985800","citation_count":24,"is_preprint":false},{"pmid":"18040775","id":"PMC_18040775","title":"Mammalian Ste20-like protein kinase 3 mediates trophoblast apoptosis in spontaneous delivery.","date":"2008","source":"Apoptosis : an international journal on programmed cell death","url":"https://pubmed.ncbi.nlm.nih.gov/18040775","citation_count":23,"is_preprint":false},{"pmid":"19782762","id":"PMC_19782762","title":"Mammalian Ste20-like protein kinase 3 induces a caspase-independent apoptotic pathway.","date":"2009","source":"The international journal of biochemistry & cell 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Developmental brain research","url":"https://pubmed.ncbi.nlm.nih.gov/12480135","citation_count":23,"is_preprint":false},{"pmid":"31034165","id":"PMC_31034165","title":"microRNA-222 promotes colorectal cancer cell migration and invasion by targeting MST3.","date":"2019","source":"FEBS open bio","url":"https://pubmed.ncbi.nlm.nih.gov/31034165","citation_count":22,"is_preprint":false},{"pmid":"23296203","id":"PMC_23296203","title":"Structural insights into the activation of MST3 by MO25.","date":"2013","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/23296203","citation_count":22,"is_preprint":false},{"pmid":"16837460","id":"PMC_16837460","title":"v-Src-dependent down-regulation of the Ste20-like kinase SLK by casein kinase II.","date":"2006","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16837460","citation_count":22,"is_preprint":false},{"pmid":"32745097","id":"PMC_32745097","title":"Cell-substrate adhesion drives Scar/WAVE activation and phosphorylation by a Ste20-family kinase, which controls pseudopod lifetime.","date":"2020","source":"PLoS biology","url":"https://pubmed.ncbi.nlm.nih.gov/32745097","citation_count":22,"is_preprint":false},{"pmid":"20124694","id":"PMC_20124694","title":"Structures of human MST3 kinase in complex with adenine, ADP and Mn2+.","date":"2010","source":"Acta crystallographica. 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Cell physiology","url":"https://pubmed.ncbi.nlm.nih.gov/23076791","citation_count":20,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48099,"output_tokens":6617,"usd":0.121776,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15467,"output_tokens":6389,"usd":0.11853,"stage2_stop_reason":"end_turn"},"total_usd":0.240306,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"MST3 (mst-3) was cloned and characterized as a serine/threonine kinase that phosphorylates basic exogenous substrates and itself in vitro, preferring Mn2+ over Mg2+ as a divalent cation cofactor and able to use both GTP and ATP as phosphate donors; activation occurs by autophosphorylation.\",\n      \"method\": \"In vitro kinase assay, biochemical characterization of purified recombinant protein\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct in vitro enzymatic characterization with multiple biochemical readouts in the cloning paper; replicated in structural studies\",\n      \"pmids\": [\"9353338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"A brain-specific isoform of MST3, termed MST3b (encoded by STK24), was identified with expression restricted to brain. MST3b is phosphorylated by cAMP-dependent protein kinase (PKA) at Thr-18, a site absent in MST3, and mutation T18A abolishes PKA phosphorylation and partially activates p42/44 MAPK, whereas MST3 (but not MST3b) activates p42/44 MAPK up to 4-fold.\",\n      \"method\": \"Northern blot, Western blot, in vivo and in vitro PKA phosphorylation assay, site-directed mutagenesis (T18A), co-transfection in HEK293 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro and in vivo phosphorylation assays with mutagenesis in a single lab; multiple orthogonal methods\",\n      \"pmids\": [\"10644707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"MST3 (Mst3) is specifically cleaved by caspase (at AETD313) during Fas- or staurosporine-induced apoptosis in Jurkat cells. Caspase-mediated removal of the C-terminal regulatory domain activates intrinsic kinase activity and promotes nuclear translocation. Kinase activity is required for apoptotic effects; catalytically inactive Mst3 does not induce DNA fragmentation.\",\n      \"method\": \"Anti-Fas antibody and staurosporine treatment of Jurkat cells, caspase inhibitor (Ac-DEVD-CHO), recombinant caspase assay, site-directed mutagenesis of cleavage site, overexpression of WT vs. kinase-dead Mst3, TUNEL/morphology assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro caspase cleavage, mutagenesis of cleavage site, gain/loss-of-function with multiple orthogonal readouts in a single rigorous study\",\n      \"pmids\": [\"12107159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MST3 (Mst3) contains a bipartite-like nuclear localization sequence (NLS) at residues 278–292 (C-terminus of kinase domain) and nuclear export signals in the regulatory domain (residues 335–386). Removal of the NLS leads to cytoplasmic accumulation, while deletion of NES or leptomycin B treatment leads to nuclear accumulation.\",\n      \"method\": \"EGFP-fusion protein serial deletions, leptomycin B treatment, fluorescence microscopy\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct localization experiments with deletion mutants and inhibitor treatment; single lab, two orthogonal approaches\",\n      \"pmids\": [\"15304321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MST3 phosphorylates NDR1/NDR2 protein kinase at the hydrophobic motif site Thr444/Thr442 in vitro, resulting in ~10-fold stimulation of NDR activity. In vivo, kinase-dead MST3 (MST3KR) potently inhibits Thr442 phosphorylation after okadaic acid stimulation, and shRNA knockdown of MST3 abolishes hydrophobic motif phosphorylation of NDR in HEK293F cells.\",\n      \"method\": \"In vitro kinase assay, shRNA knockdown, dominant-negative (MST3KR) overexpression, phospho-specific antibody detection in HEK293F cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay plus in-cell loss-of-function with multiple orthogonal methods; well-controlled study\",\n      \"pmids\": [\"16314523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MST3 inhibits cell migration in MCF-7 cells; siRNA suppression of MST3 enhances migration and reduces E-cadherin at migrating cell edges. Autophosphorylation at Thr178 is required for kinase activity; T178A mutant lacks autophosphorylation and kinase activity and fails to inhibit migration. MST3 phosphorylates PTP-PEST and inhibits its tyrosine phosphatase activity, thereby modulating paxillin phosphorylation at Y118 and Y31.\",\n      \"method\": \"siRNA knockdown, RNAi-resistant rescue, in vitro kinase assay, site-directed mutagenesis (T178A), paxillin phospho-specific antibodies, PTP-PEST phosphatase activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro biochemistry with mutagenesis, cell-based loss-of-function rescue, and substrate phosphatase activity assay; multiple orthogonal methods\",\n      \"pmids\": [\"17046825\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mst3b (encoded by Stk24) mediates axon-promoting effects of trophic factors in retinal ganglion cells (RGCs) and dorsal root ganglion (DRG) neurons. shRNA knockdown of Mst3b prevents trophic-factor-induced axon regeneration; kinase-dead Mst3b blocks axon extension; constitutively active Mst3b enables axon growth without growth factors. In vivo, Mst3b-deficient RGCs fail to regenerate axons after optic nerve crush with intraocular inflammation, and Mst3b knockdown attenuates DRG axon regeneration and p42/44 MAPK activation.\",\n      \"method\": \"shRNA knockdown, kinase-dead and constitutively active mutant expression, in vitro neurite outgrowth assay, in vivo optic nerve crush model, p42/44 MAPK immunoblotting\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain- and loss-of-function in both in vitro and in vivo models with defined pathway readout (p42/44 MAPK); multiple approaches\",\n      \"pmids\": [\"19855390\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Mst3b (STK24 isoform) is activated in response to trophic factors and by the purine nucleoside inosine (an axon growth promoter), while 6-thioguanine (a purine analog that blocks axon outgrowth) inhibits Mst3b kinase activity. siRNA suppression or dominant-negative expression of Mst3b blocks axon outgrowth in embryonic cortical neurons.\",\n      \"method\": \"In vitro kinase assay with inosine/6-thioguanine, siRNA knockdown, dominant-negative mutant expression, neurite outgrowth assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase activity measurement, cellular loss-of-function, and direct small-molecule modulation of kinase; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"17114295\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Crystal structures of human MST3 catalytic domain (residues 19–289) were solved in complexes with ADP and Mn2+, and with adenine alone. The structures show that Mn2+ is coordinated by Asn149 and Asp162, and that phosphorylation of Thr178 in the activation loop (sandwiched by Arg143 and Arg176) is associated with a 180° loop rotation leading to kinase activation.\",\n      \"method\": \"X-ray crystallography (multiple crystal structures)\",\n      \"journal\": \"Acta crystallographica. Section D, Biological crystallography\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with multiple ligand-bound states in one study; structurally confirms Mn2+ preference and activation loop phosphorylation mechanism\",\n      \"pmids\": [\"20124694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MO25α and MO25β bind to MST3 (and MST4/YSK1) and stimulate MST3 kinase activity ~3–4-fold. siRNA-mediated reduction of MO25 in cells inhibits downstream signaling, rescued by re-expression of MO25α.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, siRNA knockdown, rescue experiment\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP plus in vitro activity assay and cellular siRNA rescue; replicated across multiple STE20 family members with consistent mechanism\",\n      \"pmids\": [\"21423148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Striatin scaffolds MST3 and recruits PP2A to regulate MST3 phosphorylation and activity. PP2A binds the coiled-coil/oligomerization domain of striatin (requiring its caveolin-binding domain for oligomerization), while MST3 associates with striatin residues 191–344 likely as a dimer with CCM3. Point mutations in striatin that disrupt PP2A binding cause hyperphosphorylation and activation of striatin-associated MST3 via autophosphorylation of multiple activation loop sites.\",\n      \"method\": \"Co-immunoprecipitation, point mutagenesis, structure-function deletion analysis, phosphorylation state analysis\",\n      \"journal\": \"BMC biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and mutagenesis mapping of binding sites with functional phosphorylation readout; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"21985334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A non-canonical pathway of MST3 activation involves dephosphorylation: inactive MST3 co-immunoprecipitates with Golgi protein GOLGA2/GM130 in basal state. Phosphatase inhibition (calyculin A) triggers autophosphorylation of MST3 at both Thr178 (activation loop, increases kinase activity) and Thr328 (regulatory domain, requires residues 341–376 as a docking domain). Thr328 phosphorylation is necessary for MST3 to associate with MO25 and for MST3 dissociation from GM130.\",\n      \"method\": \"Co-immunoprecipitation, calyculin A treatment, site-directed mutagenesis, in vitro kinase assay, phospho-specific antibodies\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro kinase assay with mutagenesis, co-IP for binding partners, and calyculin A pharmacological dissection; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"22229648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Crystal structure of MST3 catalytic domain (residues 19–289) in complex with full-length MO25β reveals an intricate interface stabilizing MST3 in a closed, active conformation. Interface residues Tyr223 of MO25β and Glu58 and Ile71 of MST3, when mutated, prevent MST3 activation by MO25β. The MO25β binding mode is analogous to MO25α interaction with pseudokinase STRADα.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis (Y223, E58, I71), in vitro kinase activity assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with mutagenesis validation of interface residues; rigorous structural study with functional follow-up\",\n      \"pmids\": [\"23296203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MST3 kinase activity is essential for dendritic filopodia, spine synapse, and excitatory synapse development in hippocampal neurons. Chemical-genetic substrate trapping identified 13 MST3 substrates; TAO1/2 kinases were validated substrates whose phosphorylation by MST3 is required for Myosin Va dendritic localization and spine development.\",\n      \"method\": \"shRNA knockdown, kinase-dead MST3 expression, in utero electroporation (spine density in vivo), chemical genetics (analog-sensitive kinase), SILAC-based substrate identification, phospho-site mapping\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — chemical genetics plus SILAC for substrate ID, in vitro/in vivo phosphorylation, in utero electroporation for in vivo phenotype; multiple rigorous orthogonal methods\",\n      \"pmids\": [\"25456499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MST3 regulates radial neuronal migration in the developing neocortex. Mst3 silencing (in utero electroporation) perturbs multipolar-to-bipolar transition of migrating neurons. Kinase activity of MST3 is required for this function and is regulated by Cdk5 phosphorylation of MST3 at Ser79. MST3 phosphorylates RhoA at Ser26, thereby negatively regulating RhoA GTPase activity; RhoA knockdown rescues migration defects caused by Mst3 knockdown.\",\n      \"method\": \"In utero electroporation (shRNA), in vitro kinase assay, Cdk5 phosphorylation assay (Ser79 mutagenesis), RhoA-GTP pulldown assay, rescue epistasis (RhoA knockdown)\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vivo loss-of-function, in vitro substrate phosphorylation with mutagenesis, and genetic epistasis rescue; multiple orthogonal methods\",\n      \"pmids\": [\"24872548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MST3 promotes proliferation and tumorigenicity in breast cancer through interaction with VAV2 via a proline-rich region (353KDIPKRP359) of MST3 binding the SH3 domain of VAV2. This interaction leads to VAV2 phosphorylation and Rac1 (GTP-Rac1) activation, cyclin D1 expression, and increased cell growth; mutation of the proline-rich domain (ΔP-MST3) abolishes VAV2 interaction and oncogenic effects.\",\n      \"method\": \"Co-immunoprecipitation, confocal microscopy co-localization, domain mapping mutagenesis, GTP-Rac1 pulldown assay, shRNA knockdown, soft agar growth assay, xenograft tumor formation\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, domain-level mutagenesis of interaction, downstream Rac1-GTP pulldown, in vitro and in vivo tumor assays; multiple orthogonal methods\",\n      \"pmids\": [\"26910843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MST3/STK24 inhibits the insulin signaling pathway: MST3 knockout mice on a high-fat diet show reduced hyperglycemia, hyperinsulinemia, and insulin resistance. Lack of MST3 activates insulin signaling downstream of IRS1, increases FOXO1 inhibition, and downregulates gluconeogenic enzyme expression. Mst3 is phosphorylated in livers of mice on an obesity-promoting diet.\",\n      \"method\": \"Mst3 knockout mice (HFD model), RNAi in human liver cells, insulin signaling pathway immunoblotting (phospho-IRS1, Akt, FOXO1), gluconeogenic gene expression analysis\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout mouse model with in vivo metabolic phenotype, corroborated by RNAi in human cells with defined signaling pathway readouts; two orthogonal systems\",\n      \"pmids\": [\"28956081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MST3 protein coats lipid droplets in mouse and human hepatocytes. MST3 knockdown attenuates lipid accumulation by stimulating β-oxidation and triacylglycerol secretion while inhibiting fatty acid influx and lipid synthesis; mechanistically, lipogenic gene expression and acetyl-CoA carboxylase protein abundance are reduced in MST3-deficient hepatocytes.\",\n      \"method\": \"siRNA knockdown in human hepatocytes, lipid droplet imaging/co-localization, β-oxidation assay, lipid secretion assay, fatty acid uptake assay, gene expression analysis\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct subcellular localization to lipid droplets, multiple lipid metabolic flux assays, mechanistic gene expression readouts; single lab with multiple orthogonal functional methods\",\n      \"pmids\": [\"31173506\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In vivo antisense oligonucleotide (ASO)-mediated silencing of Mst3 in obese mice ameliorates NAFLD (steatosis, inflammation, fibrosis). Mst3 ASOs suppress lipogenic gene expression and ACC protein abundance, and reduce lipotoxicity-mediated oxidative and ER stress in liver.\",\n      \"method\": \"Antisense oligonucleotide treatment in HFD mouse model, liver histology, gene expression analysis, ACC protein immunoblotting, oxidative/ER stress markers\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo loss-of-function with ASOs, multiple histological and biochemical endpoints; confirms and extends previous in vitro findings\",\n      \"pmids\": [\"33891332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Phosphorylation site specificity of MST3/STK24 was defined by peptide arrays; structure-guided mutagenesis identified β3-αC loop residues in the catalytic cleft as specificity determinants. Exchanging key residues between MST4 and PAK4 could largely interconvert their phosphorylation site preferences and downstream signaling (Hippo vs. actin remodeling), demonstrating that catalytic site specificity is necessary and sufficient for distinct signaling outputs.\",\n      \"method\": \"Peptide array (phosphorylation site profiling), structure-guided mutagenesis, cell-based signaling assays (Hippo pathway, actin remodeling readouts)\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — peptide array plus mutagenesis and cell-based signaling; mechanistic claims about MST3/STK24 specificity are part of a broader STE20 family study\",\n      \"pmids\": [\"30897078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"STK24 (MST3/STK24) was identified as a novel substrate and interacting protein of LRRK2 kinase by protein microarray. LRRK2 phosphorylates STK24 in vitro.\",\n      \"method\": \"Protein microarray with 260 signal transduction proteins, in vitro kinase assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single protein microarray experiment, no reciprocal validation or mutagenesis; identification is suggestive only\",\n      \"pmids\": [\"20949042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"MST3 trophoblast apoptosis: MST3 expression is induced by oxidative stress (H2O2) in human trophoblasts. Overexpression of kinase-dead MST3KR or shRNA knockdown of MST3 suppresses H2O2-induced apoptosis. JNK participates upstream of Mst3 in this pathway, and caspase 3 and downstream apoptotic components are activated by Mst3.\",\n      \"method\": \"shRNA knockdown, kinase-dead (MST3KR) overexpression, JNK inhibitor, caspase inhibitor, apoptosis assays in 3A-sub-E trophoblast cell line\",\n      \"journal\": \"Apoptosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — loss-of-function with shRNA plus kinase-dead dominant negative; pathway ordering by inhibitor epistasis; single lab\",\n      \"pmids\": [\"18040775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MST3 triggers a caspase-independent apoptotic pathway: Mst3 knockdown reduces staurosporine-induced apoptosis by ~65%; Mst3 is required for mitochondrial membrane potential transition (Bax regulation), and for nuclear translocation of apoptosis-inducing factor (AIF) and endonuclease G (EndoG), as well as EndoG nuclease activity.\",\n      \"method\": \"Stable shRNA knockdown clones, mitochondrial membrane potential assay (JC-1), AIF/EndoG nuclear translocation by immunofluorescence, nuclease activity assay, caspase inhibitor (z-DEVD-fmk)\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — cellular loss-of-function with multiple orthogonal mechanistic readouts; single lab study\",\n      \"pmids\": [\"19782762\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"STK24 (MST3/Mst3b) is a serine/threonine kinase of the GCK-III subfamily that is activated by autophosphorylation at Thr178 (with Mn2+ as preferred cofactor), allosterically stimulated ~3–4-fold by MO25 scaffolding proteins (via a defined interface stabilizing the active conformation), and negatively regulated by striatin-anchored PP2A; in response to apoptotic stimuli, caspase cleaves MST3 at AETD313, releasing the catalytic domain from C-terminal inhibition and driving nuclear translocation; activated MST3 phosphorylates NDR kinases at their hydrophobic motif (Thr442/444), TAO1/2 kinases to enable Myosin Va-dependent spine synapse development, RhoA at Ser26 to inhibit GTPase activity and control neuronal migration (downstream of Cdk5-mediated phosphorylation at Ser79), PTP-PEST to modulate paxillin phosphorylation and suppress cell migration, and VAV2 to activate Rac1 signaling; Mst3b isoform additionally mediates trophic-factor- and purine-dependent axon regeneration in CNS and PNS neurons, and MST3 localizes to intracellular lipid droplets where it promotes hepatic lipogenesis and inhibits fatty acid oxidation, contributing to insulin resistance and NAFLD.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"STK24 (MST3/Mst3b) is a GCK-III subfamily serine/threonine kinase that integrates apoptotic, neurodevelopmental, and hepatic metabolic signaling through phosphorylation of distinct substrate sets [#0, #13, #14]. Its catalytic output depends on autophosphorylation of the activation-loop residue Thr178, with Mn2+ as the preferred cofactor; crystal structures show that Thr178 phosphorylation, coordinated by Arg143/Arg176, drives an activation-loop rotation that switches the kinase to its active conformation [#0, #5, #8]. Kinase activity is allosterically amplified ~3-4-fold by the MO25alpha/beta scaffolds, which dock through a defined interface (MO25beta Tyr223 with MST3 Glu58/Ile71) that locks MST3 in a closed, active state, and is held in check by a striatin-anchored PP2A whose disruption causes MST3 hyperphosphorylation [#9, #12, #10]. Activation can also proceed non-canonically by dephosphorylation-triggered autophosphorylation at Thr178 and the regulatory-domain site Thr328, the latter licensing MO25 association and release from a basal GM130/GOLGA2 pool [#11]. During Fas- or staurosporine-induced apoptosis, caspase cleavage at AETD313 removes the C-terminal regulatory domain, activating the catalytic core and driving nuclear translocation via an NLS otherwise opposed by a regulatory-domain NES [#2, #3]. As an effector kinase, MST3 phosphorylates NDR1/2 at their hydrophobic motif (Thr442/444) to stimulate NDR activity, TAO1/2 kinases to direct Myosin Va-dependent dendritic spine and synapse development, RhoA at Ser26 to suppress its GTPase activity and control radial neuronal migration downstream of Cdk5-mediated Ser79 phosphorylation, and PTP-PEST to modulate paxillin phosphorylation and inhibit cell migration [#4, #13, #14, #5]. Through a proline-rich motif engaging the VAV2 SH3 domain, MST3 activates VAV2-Rac1 signaling to promote breast cancer proliferation and tumorigenicity [#15]. The brain-restricted Mst3b isoform, distinguished by a PKA site at Thr18, mediates trophic-factor- and purine-dependent axon regeneration in CNS and PNS neurons [#1, #6, #7]. MST3 also coats hepatic lipid droplets, where it promotes lipogenesis and acetyl-CoA carboxylase abundance while suppressing fatty acid oxidation, and its loss in mice protects against insulin resistance and NAFLD [#17, #16, #18].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established STK24 as an autoactivating serine/threonine kinase, defining the basic enzymatic identity and its unusual Mn2+ and GTP/ATP usage.\",\n      \"evidence\": \"In vitro kinase assays on purified recombinant MST3\",\n      \"pmids\": [\"9353338\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No physiological substrates identified\", \"Cellular regulation of autophosphorylation unknown\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Identified a brain-specific MST3b isoform with a unique PKA phosphorylation site (Thr18), revealing isoform-specific regulation and differential MAPK coupling.\",\n      \"evidence\": \"Northern/Western blots, PKA phosphorylation and T18A mutagenesis in HEK293\",\n      \"pmids\": [\"10644707\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of Thr18 phosphorylation in neurons not defined\", \"Mechanism of differential MAPK activation unclear\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed that caspase cleavage at AETD313 removes C-terminal autoinhibition to activate MST3 and drive nuclear translocation during apoptosis, linking the kinase to programmed cell death.\",\n      \"evidence\": \"Fas/staurosporine treatment, recombinant caspase cleavage, cleavage-site and kinase-dead mutagenesis in Jurkat cells\",\n      \"pmids\": [\"12107159\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nuclear substrates of cleaved MST3 not identified\", \"Physiological apoptotic contexts beyond cell lines unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mapped the NLS and NES governing MST3 shuttling, explaining how regulatory-domain signals control nuclear access.\",\n      \"evidence\": \"EGFP-fusion deletions and leptomycin B in fluorescence microscopy\",\n      \"pmids\": [\"15304321\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Signals controlling shuttling in physiological conditions not defined\", \"Single-lab localization study without endogenous validation\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified NDR1/2 as direct MST3 substrates at their hydrophobic motif, placing MST3 upstream of NDR kinase activation.\",\n      \"evidence\": \"In vitro kinase assay, shRNA knockdown and dominant-negative MST3 with phospho-specific antibodies in HEK293F\",\n      \"pmids\": [\"16314523\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream NDR-dependent outputs in this context not defined\", \"Conditions selecting NDR among substrates unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined Thr178 autophosphorylation as essential for activity and showed MST3 suppresses migration via PTP-PEST/paxillin, establishing a cytoskeletal-regulatory role.\",\n      \"evidence\": \"siRNA/rescue, T178A mutagenesis, PTP-PEST phosphatase and paxillin phospho-assays in MCF-7\",\n      \"pmids\": [\"17046825\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct PTP-PEST phosphosite not mapped\", \"Relationship between migration suppression and later oncogenic role unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linked Mst3b activity to purine- and trophic-factor-driven axon outgrowth, with direct small-molecule modulation by inosine and 6-thioguanine.\",\n      \"evidence\": \"In vitro kinase assays with purines, siRNA/dominant-negative in cortical neuron outgrowth assays\",\n      \"pmids\": [\"17114295\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct purine-binding mechanism not established\", \"Substrates mediating axon outgrowth not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Implicated MST3 in oxidative-stress-induced trophoblast apoptosis downstream of JNK and upstream of caspase-3.\",\n      \"evidence\": \"shRNA, kinase-dead overexpression, JNK/caspase inhibitor epistasis in trophoblast cells\",\n      \"pmids\": [\"18040775\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct MST3 substrates in this pathway unknown\", \"Single cell-line model\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated Mst3b is required for trophic-factor-induced axon regeneration in vivo, validating its neuronal regenerative function.\",\n      \"evidence\": \"shRNA, kinase-dead/constitutively-active mutants, optic nerve crush and DRG regeneration with MAPK readout\",\n      \"pmids\": [\"19855390\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct substrates coupling Mst3b to MAPK not defined\", \"Translational applicability to other injury models unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed MST3 drives a caspase-independent apoptotic arm via mitochondrial AIF/EndoG release, broadening its death-signaling repertoire.\",\n      \"evidence\": \"Stable shRNA, JC-1 membrane potential, AIF/EndoG translocation and nuclease assays\",\n      \"pmids\": [\"19782762\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct MST3 substrates upstream of mitochondrial events unknown\", \"Relationship to caspase-cleavage pathway not reconciled\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Resolved crystal structures defining Mn2+ coordination and the activation-loop rotation triggered by Thr178 phosphorylation, providing the structural basis of activation.\",\n      \"evidence\": \"X-ray crystallography of MST3 catalytic domain with ADP/Mn2+ and adenine\",\n      \"pmids\": [\"20124694\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length regulatory-domain structure absent\", \"Conformational dynamics in cells not captured\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Reported LRRK2 as an in vitro kinase for STK24, raising a possible upstream regulatory link.\",\n      \"evidence\": \"Protein microarray screen and in vitro kinase assay\",\n      \"pmids\": [\"20949042\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single microarray without reciprocal validation or mutagenesis\", \"Phosphosite and cellular relevance unestablished\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified MO25alpha/beta as allosteric activators of MST3, establishing scaffold-driven control of kinase output.\",\n      \"evidence\": \"Reciprocal co-IP, in vitro kinase assay, siRNA/rescue\",\n      \"pmids\": [\"21423148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and dynamics in cells not defined\", \"Substrate selection by MO25-bound MST3 unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined striatin-scaffolded PP2A as a negative regulator dephosphorylating MST3, completing an activator/inhibitor balance.\",\n      \"evidence\": \"Co-IP, point/deletion mutagenesis mapping with phosphorylation readouts\",\n      \"pmids\": [\"21985334\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative interplay with MO25 activation not resolved\", \"In vivo relevance of the striatin-PP2A axis unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Revealed a dephosphorylation-triggered, two-site autophosphorylation mechanism (Thr178/Thr328) coupling release from GM130 to MO25 binding.\",\n      \"evidence\": \"Co-IP, calyculin A, site-directed mutagenesis, in vitro kinase assays\",\n      \"pmids\": [\"22229648\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological trigger for the dephosphorylation step unknown\", \"Functional consequence of GM130 sequestration undefined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Solved the MST3-MO25beta complex structure and validated interface residues required for allosteric activation.\",\n      \"evidence\": \"X-ray crystallography with Y223/E58/I71 mutagenesis and kinase assays\",\n      \"pmids\": [\"23296203\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MO25 alters substrate specificity not addressed\", \"Dynamics of complex assembly in cells unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Used chemical-genetic substrate trapping to identify TAO1/2 as MST3 substrates governing Myosin Va-dependent spine and synapse development.\",\n      \"evidence\": \"Analog-sensitive kinase, SILAC substrate ID, in utero electroporation, shRNA/kinase-dead\",\n      \"pmids\": [\"25456499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Roles of the other identified substrates unexplored\", \"TAO phosphosites linking to Myosin Va not fully mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed MST3 controls radial neuronal migration by phosphorylating RhoA at Ser26 downstream of Cdk5 Ser79 phosphorylation, with RhoA epistasis rescuing the phenotype.\",\n      \"evidence\": \"In utero electroporation, in vitro kinase/mutagenesis, RhoA-GTP pulldown, genetic rescue\",\n      \"pmids\": [\"24872548\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Cdk5 input integrates with MO25/striatin regulation unclear\", \"Other GTPase substrates not surveyed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established an oncogenic MST3-VAV2-Rac1 axis through a proline-rich motif/SH3 interaction promoting breast cancer growth.\",\n      \"evidence\": \"Co-IP, domain mapping, GTP-Rac1 pulldown, soft agar and xenograft assays\",\n      \"pmids\": [\"26910843\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation with MST3's migration-suppressive role unresolved\", \"Whether catalytic activity vs scaffolding drives the effect unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defined catalytic-cleft determinants of phosphosite specificity, showing site preference dictates distinct signaling outputs across the kinase family.\",\n      \"evidence\": \"Peptide arrays, structure-guided mutagenesis, cell-based signaling assays\",\n      \"pmids\": [\"30897078\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"MST3-specific consensus not exhaustively validated\", \"Part of a broader STE20 family study\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified MST3 as a suppressor of insulin signaling, with knockout mice protected from diet-induced insulin resistance, linking the kinase to metabolic disease.\",\n      \"evidence\": \"Mst3 knockout HFD mice, RNAi in human liver cells, insulin pathway immunoblotting\",\n      \"pmids\": [\"28956081\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct MST3 substrates in the insulin pathway not identified\", \"Tissue-specific contributions undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Localized MST3 to hepatic lipid droplets and showed it promotes lipogenesis while inhibiting beta-oxidation, defining a hepatic metabolic function.\",\n      \"evidence\": \"siRNA in human hepatocytes, lipid droplet imaging, beta-oxidation/secretion/uptake assays, gene expression\",\n      \"pmids\": [\"31173506\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism targeting MST3 to lipid droplets unknown\", \"Kinase substrates controlling lipogenic genes not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated therapeutic potential by showing ASO silencing of Mst3 ameliorates NAFLD in obese mice.\",\n      \"evidence\": \"ASO treatment in HFD mice, liver histology, ACC immunoblotting, stress markers\",\n      \"pmids\": [\"33891332\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Long-term safety and specificity of MST3 inhibition unknown\", \"Direct molecular targets driving steatosis reduction undefined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The unifying logic that selects which substrate set (apoptotic, neuronal, metabolic, oncogenic) MST3 acts on in a given cell remains unresolved, as does how scaffold (MO25/striatin), localization (GM130/lipid droplet), and upstream kinase inputs (Cdk5/PKA) are integrated.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No integrated model linking regulatory inputs to substrate choice\", \"Mechanism of lipid-droplet targeting unknown\", \"Reconciliation of pro-apoptotic, pro-migratory-suppressive, and oncogenic roles missing\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 5, 13, 14, 15]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 4, 5, 14]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0005811\", \"supporting_discovery_ids\": [17]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2, 22]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 14, 15, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 13, 14]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [16, 17, 18]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [15, 16, 18]}\n    ],\n    \"complexes\": [\n      \"striatin-PP2A complex\"\n    ],\n    \"partners\": [\n      \"MO25 (CAB39)\",\n      \"STRN (striatin)\",\n      \"GOLGA2\",\n      \"NDR1/NDR2 (STK38)\",\n      \"TAOK1/TAOK2\",\n      \"RhoA\",\n      \"PTPN12 (PTP-PEST)\",\n      \"VAV2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}