{"gene":"MAPKAP1","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2006,"finding":"SIN1/MIP1 (MAPKAP1) is an essential subunit of the mTORC2 (rictor-mTOR) complex. Genetic ablation of sin1 abolished Akt-Ser473 phosphorylation and disrupted rictor-mTOR interaction while maintaining Thr308 phosphorylation. Loss of Ser473 phosphorylation selectively affected FoxO1/3a but not TSC2, GSK3, S6K, or 4E-BP1, indicating SIN1-mTORC2 is required for cell survival but dispensable for mTORC1 function.","method":"Genetic ablation (sin1 knockout), immunoprecipitation, in vivo phosphorylation assays","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, genetic KO with specific phosphorylation readouts, replicated in multiple systems","pmids":["16962653"],"is_preprint":false},{"year":2006,"finding":"Sin1 is an essential component of mTORC2 but not mTORC1, required for mTORC2 complex formation, kinase activity toward Akt hydrophobic motif (Ser473), and Rictor-mTOR interaction. Sin1 knockdown decreases Akt phosphorylation in both Drosophila and mammalian cells. Disruption of Rictor in mice causes embryonic lethality and ablates Akt phosphorylation.","method":"RNAi knockdown in Drosophila and mammalian cells, Co-immunoprecipitation, in vitro kinase assay, Rictor knockout mice","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro kinase assay, genetic KO, RNAi in multiple organisms, reciprocal Co-IP; independently replicates PMID 16962653","pmids":["17043309"],"is_preprint":false},{"year":2015,"finding":"Akt (not S6K) is the major kinase responsible for phosphorylating SIN1 at T86 in all cell lines studied, creating a positive feedback loop: PDK1 phosphorylates Akt at T308 → Akt phosphorylates SIN1 at T86 → enhanced mTORC2 kinase activity → mTORC2 phosphorylates Akt at S473 for full Akt activation.","method":"Pharmacological inhibition of Akt, S6K, and mTOR; phospho-specific antibodies; multiple cell lines and conditions","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal inhibitors, multiple cell lines, specific phospho-site analysis contradicting prior claim","pmids":["26235620"],"is_preprint":false},{"year":2013,"finding":"Phosphorylation of Sin1 at Thr86 and Thr398 by S6K or Akt (context-dependent) suppresses mTORC2 kinase activity by dissociating Sin1 from the mTORC2 complex, inhibiting Akt Ser473 phosphorylation. A cancer-patient-derived Sin1-R81T mutation impairs Sin1 T86 phosphorylation, leading to mTORC2 hyper-activation and enhanced Akt signaling.","method":"Phospho-site mutagenesis, Co-immunoprecipitation, in vitro kinase assay, patient-derived mutation analysis","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — mutagenesis, Co-IP, in vitro kinase assays, patient mutation validation, multiple orthogonal methods in single study","pmids":["24161930"],"is_preprint":false},{"year":2014,"finding":"Dual phosphorylation of Sin1 at T86 and T398 negatively regulates mTORC2 complex integrity and activity by causing Sin1 dissociation from the holo-enzyme, reducing Akt activity and sensitizing cells to apoptosis. The ovarian cancer-derived Sin1-R81T mutation abolishes S6K-mediated T86 phosphorylation, bypassing this negative regulation.","method":"Phospho-site mutagenesis, Co-immunoprecipitation, apoptosis assays, cancer patient mutation analysis","journal":"Protein & cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis and Co-IP data, single lab, corroborates PMID 24161930","pmids":["24481632"],"is_preprint":false},{"year":2011,"finding":"The mTORC2 subunit Sin1 directly binds the PKCε kinase domain through Sin1's central conserved region, and serves as a selectivity adaptor for recruitment of mTORC2 substrates (both PKCε and PKB/Akt). Inducible expression of Sin1 mutants lacking the PKC-interaction domain disrupts PKC phosphorylation and suppresses PKB/Akt phosphorylation without affecting mTORC1 substrate p70S6K.","method":"Co-immunoprecipitation, domain mapping, inducible dominant-negative Sin1 mutant expression, in vitro kinase assay, 3D culture proliferation assay","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, domain mapping, multiple substrate readouts, dominant-negative approach with specific controls","pmids":["21806543"],"is_preprint":false},{"year":2017,"finding":"The conserved region in the middle of Sin1 (Sin1CRIM) forms a ubiquitin-like fold domain that specifically binds TORC2 substrate kinases (e.g., Gad8/SGK) to recruit them for phosphorylation; Sin1 is dispensable for TORC2 catalytic activity per se but essential for substrate specificity. Sin1CRIM fused to a different TORC2 subunit can rescue substrate phosphorylation in sin1-null fission yeast. The substrate-recognition function is conserved in human Sin1CRIM.","method":"NMR solution structure determination, genetic rescue in sin1 null fission yeast, Co-immunoprecipitation, mutagenesis of acidic loop","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structure with functional validation, mutagenesis, genetic rescue, conserved in human protein","pmids":["28264193"],"is_preprint":false},{"year":2012,"finding":"X-ray crystal structures of the C-terminal pleckstrin homology (PH) domain of S. cerevisiae Avo1 (Sin1 orthologue) and human Sin1 were determined, revealing a PH domain fold with a putative phosphoinositide binding site, consistent with membrane localization of TORC2.","method":"X-ray crystallography","journal":"Acta crystallographica. Section F","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structures determined but functional validation of phosphoinositide binding not experimentally confirmed in this paper","pmids":["22505404"],"is_preprint":false},{"year":2015,"finding":"The PH domain of SIN1 directly binds the PI3K lipid product PtdIns(3,4,5)P3 to promote mTORC2 kinase activation and membrane localization, providing a mechanistic link between PI3K and mTORC2.","method":"Lipid binding assay, membrane localization experiments (referenced review summarizing Liu et al. experimental findings)","journal":"Cancer discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — described in review commentary, references primary experimental data from Liu et al.; indirect citation","pmids":["26526694"],"is_preprint":false},{"year":2007,"finding":"Human Sin1 contains a functional Raf-like Ras-binding domain (RBD) and a pleckstrin homology (PH) domain. The PH domain mediates lipid and membrane binding; the RBD binds activated H- and K-Ras. Sin1 and Ras co-immunoprecipitate and co-localize in vivo. Overexpression of Sin1 inhibits ERK, Akt, and JNK activation by Ras, while siRNA knockdown of Sin1 enhances Ras-induced ERK1/2 activation.","method":"Domain functional analysis, co-immunoprecipitation, co-localization imaging, siRNA knockdown, overexpression studies","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, co-localization, RNAi and overexpression, single lab","pmids":["17303383"],"is_preprint":false},{"year":2022,"finding":"High-resolution crystal structures of HRas/KRas-SIN1 RBD complexes revealed the detailed interaction interface. Mutation of critical interface residues abolished Ras-SIN1 interaction. In SIN1 knockout cells, Ras-SIN1 association promotes SGK1 activity but inhibits insulin-induced ERK activation. The SIN1 PH domain has an inhibitory effect on Ras-SIN1 binding; a SIN1 isoform lacking the PH domain binds Ras more strongly.","method":"X-ray crystallography, site-directed mutagenesis, FRET competition assay, SIN1 knockout cell lines, kinase activity assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with mutagenesis validation, FRET assay, KO cell functional readout, multiple orthogonal methods","pmids":["35522713"],"is_preprint":false},{"year":2008,"finding":"SIN1 (MAPKAP1) interacts with poly(rC) binding protein 2 (PCBP2) through its N-terminal domain; PCBP2 and SIN1 can be co-immunoprecipitated together with the cytoplasmic domain of the IFN receptor IFNAR2 from HeLa cells. SIN1 also associates with TNFα receptors. RNAi silencing of either SIN1 or PCBP2 renders cells sensitive to basal and stress-induced apoptosis.","method":"Two-hybrid screen, co-immunoprecipitation, RNAi knockdown, apoptosis assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — yeast two-hybrid, Co-IP with IFNAR2, RNAi functional rescue, single lab","pmids":["18687895"],"is_preprint":false},{"year":2008,"finding":"mTOR, mLST8, rictor, and Sin1 are less abundant in the nucleus than the cytoplasm of primary human fibroblasts. The mTOR/rictor complex is abundant in both compartments. Short-term rapamycin treatment triggers dephosphorylation of rictor and Sin1 exclusively in the cytoplasm without affecting mTORC2 assembly; prolonged rapamycin leads to complete dephosphorylation and cytoplasmic translocation of nuclear rictor and Sin1 accompanied by inhibition of mTORC2 assembly.","method":"Subcellular fractionation, immunofluorescence, Western blot, rapamycin treatment","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — fractionation with functional consequence (mTORC2 assembly inhibition), multiple conditions, single lab","pmids":["18614546"],"is_preprint":false},{"year":1999,"finding":"Fission yeast Sin1 interacts with the Sty1/Spc1 SAPK MAP kinase. Cells lacking Sin1 display stress sensitivity and cell-cycle delay similar to sty1/spc1 deletion but Sin1 is not required for Sty1/Spc1 activation; rather Sin1 is required downstream for stress-dependent phosphorylation and stabilization of the transcription factor Atf1 and for transcription via the AP-1 factor Pap1.","method":"Genetic interaction (sin1 deletion), two-hybrid interaction, stress assays, kinase activity assays, transcription reporter assays, chimeric rescue constructs","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis, two-hybrid, multiple phenotypic readouts, foundational study in fission yeast orthologue","pmids":["10428959"],"is_preprint":false},{"year":2006,"finding":"Mammalian Sin1 directly binds both ATF-2 and p38. Sin1 overexpression enhances osmotic stress-induced phosphorylation of ATF-2 and ATF-2-mediated transcription; siRNA knockdown of Sin1 suppresses these responses and inhibits osmotic stress-induced apoptosis and Gadd45β expression. Sin1 functions as a nuclear scaffold to promote ATF-2 signaling specificity under stress but not serum stimulation.","method":"Co-immunoprecipitation (direct binding), siRNA knockdown, overexpression, transcription reporter assay, apoptosis assay","journal":"Genes to cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding by Co-IP, RNAi with specific transcriptional and apoptotic readouts, single lab","pmids":["17054722"],"is_preprint":false},{"year":2013,"finding":"SIN1 promotes invasion and metastasis of hepatocellular carcinoma by facilitating epithelial-mesenchymal transition (EMT); depletion of SIN1 significantly decreases invasion and migration of HCC cell lines.","method":"siRNA knockdown, invasion/migration assays, EMT marker analysis (Western blot, qPCR), immunohistochemistry","journal":"Cancer","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — KD with specific cellular phenotype (invasion/EMT markers), single lab","pmids":["23564492"],"is_preprint":false},{"year":2017,"finding":"Tumor suppressor Pdcd4 inhibits Sin1 translation through an eIF4A-dependent mechanism acting on the SIN1 5'UTR. Loss of Pdcd4 increases Sin1 protein (not mRNA), enhancing mTORC2 activity and invasion. Pdcd4 mutants unable to bind eIF4A fail to inhibit Sin1 translation, mTORC2 activity, or invasion. Direct eIF4A inhibition with silvestrol suppresses Sin1 translation.","method":"5'UTR-luciferase reporter assay, Pdcd4 knockdown/knockout/rescue, eIF4A binding mutants, silvestrol treatment, invasion assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — luciferase reporter with 5'UTR, multiple Pdcd4 mutants, pharmacological validation, multiple orthogonal methods in single study","pmids":["28692058"],"is_preprint":false},{"year":2013,"finding":"DNA-PKcs associates with SIN1 in the cytosol upon UVB radiation in an EGFR-activation-dependent manner. This DNA-PKcs-SIN1 complexation is required for UVB-induced Akt Ser473 phosphorylation by mTORC2. Inhibition or depletion of either DNA-PKcs or SIN1 abolishes UVB-induced Akt Ser473 phosphorylation and enhances UVB-induced apoptosis.","method":"Co-immunoprecipitation, siRNA knockdown, dominant-negative kinase-dead mutation, gene depletion, EGFR inhibitor treatment, apoptosis assays","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, genetic and pharmacological perturbation, multiple readouts, single lab","pmids":["24365180"],"is_preprint":false},{"year":2013,"finding":"CCDC28B interacts with SIN1 (a component of mTORC2) and this interaction is important both for mTOR signaling and for a mTORC-independent role of SIN1 in cilia length regulation. Depletion of CCDC28B reduces cilia length in vivo at least partly through its interaction with Sin1. Depletion of Rictor (another mTORC2 component) does not affect cilia length, indicating a specific Sin1 function independent of the full mTORC2 complex.","method":"Co-immunoprecipitation, in vivo zebrafish/cell depletion, cilia length measurement, Rictor vs Sin1 knockdown comparison","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, in vivo genetic evidence, specific separation-of-function vs Rictor, single lab","pmids":["23727834"],"is_preprint":false},{"year":2019,"finding":"Sin1-mTORC2 controls early thymocyte (DN stage) development and glycolysis through an AKT-dependent PPAR-γ nuclear translocation pathway that controls PKM2 (pyruvate kinase M2) expression. Sin1 knockout in T lineage cells severely impairs DN thymocyte proliferation and glycolysis; PKM2 is identified as a novel Sin1 effector.","method":"Conditional Sin1 knockout in T cells, flow cytometry, glycolysis assays, PPAR-γ nuclear translocation analysis, PKM2 expression analysis","journal":"Journal of molecular cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with specific metabolic and developmental phenotype, pathway placement, single lab","pmids":["30428057"],"is_preprint":false},{"year":2019,"finding":"Sin1-mTORC2 regulates B cell growth and metabolism by maintaining c-Myc protein stability and activating mTORC1 through Akt-dependent inactivation of GSK3 and TSC1/2. Genetic ablation of Sin1 in B cells reduces cell size, impairs metabolism, proliferation, antibody responses, and anti-viral immunity.","method":"B cell-specific Sin1 conditional knockout, flow cytometry, proliferation assays, mTORC1/2 pathway analysis, c-Myc stability assay","journal":"Cellular & molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with specific immunological and molecular phenotypes, pathway placement, single lab","pmids":["30705387"],"is_preprint":false},{"year":2012,"finding":"Sin1 deficiency blocks mTORC2-dependent Akt phosphorylation in T cells. Sin1 is dispensable for T-cell receptor-induced growth, proliferation, and CD4+ helper cell differentiation, but Sin1 deficiency increases the proportion of Foxp3+ natural T-regulatory cells in the thymus. TGF-β-dependent Treg differentiation in vitro is enhanced by mTOR inhibition but not by loss of Sin1.","method":"Sin1 conditional knockout in hematopoietic system, flow cytometry, in vitro T cell differentiation assays, Akt phosphorylation analysis","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with specific immunological readouts, separation of Sin1 vs mTOR functions, single lab","pmids":["22678916"],"is_preprint":false},{"year":2018,"finding":"Sin1 T86 phosphorylation amplifies mTORC2-mediated downstream signals and is required for integrin αIIbβ3-mediated outside-in signaling in platelets, as well as hypoxia/ROS responses through the NAD+/Sirt3/SOD2 pathway. Platelet-specific Sin1 deficiency protects mice from ischemia-induced microvascular embolization and heart dysfunction after myocardial infarction.","method":"Platelet-specific Sin1 knockout mice, Sin1 T86 phosphorylation-deficient knockin mice, platelet activation assays, mouse myocardial infarction model","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO and phospho-mutant knockin mice, in vivo disease model, multiple mechanistic readouts, single lab","pmids":["30571167"],"is_preprint":false},{"year":2004,"finding":"The human Sin1 gene (MAPKAP1) produces transcripts utilizing alternative polyadenylation signals and multiple splice variants that potentially encode functionally different isoforms. A highly conserved domain shared with S. pombe Sin1, Dictyostelium RIP3, and S. cerevisiae Avo1 was identified as defining the SIN1 orthologue family.","method":"Cloning and characterization of full-length human Sin1 mRNA, RT-PCR, sequence analysis","journal":"Gene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — mRNA cloning and sequence characterization, no functional validation of isoforms","pmids":["15363842"],"is_preprint":false},{"year":2015,"finding":"Sin1γ, a novel Sin1 isoform with a C-terminal truncation due to alternative 3' termination, can interact with mTORC2 components but its overexpression in Sin1-deficient MEFs has no significant impact on mTORC2 activity or subunit levels. Sin1γ localizes to a specific cytosolic location and its localization is transiently disrupted during the cell cycle.","method":"Isoform cloning, overexpression in Sin1-deficient MEFs, mTORC2 activity assay, subcellular localization imaging, cell cycle analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — functional characterization in KO cells with specific readouts, localization imaging, single lab","pmids":["26263164"],"is_preprint":false}],"current_model":"MAPKAP1 (SIN1) is an essential scaffold subunit of mTORC2 that maintains complex integrity through direct association with rictor and mTOR, recruits AGC kinase substrates (Akt, PKCε, SGK1) via its ubiquitin-fold CRIM domain, connects mTORC2 to PI3K signaling through its PH domain's binding of PtdIns(3,4,5)P3, and suppresses Ras-ERK signaling through its RBD; SIN1 phosphorylation at T86 and T398 by Akt or S6K dissociates SIN1 from mTORC2 to negatively regulate complex activity in a feedback manner, while Akt-mediated T86 phosphorylation also creates a positive feedback loop that amplifies mTORC2 activity and full Akt activation."},"narrative":{"mechanistic_narrative":"MAPKAP1 (SIN1) is an essential scaffold subunit of mTORC2 that defines the complex's substrate specificity and couples it to upstream lipid and Ras signaling [PMID:16962653, PMID:17043309]. Genetic ablation of SIN1 disrupts the rictor–mTOR interaction and abolishes Akt Ser473 (hydrophobic motif) phosphorylation while leaving Thr308 and mTORC1 outputs intact, establishing SIN1 as required for mTORC2 assembly and activity but dispensable for mTORC1 [PMID:16962653, PMID:17043309]. The conserved central CRIM region adopts a ubiquitin-like fold that directly binds AGC-family substrate kinases including PKCε and SGK/Akt to recruit them for phosphorylation; SIN1 is dispensable for catalysis per se but essential for substrate selection, a function conserved from fission yeast to human [PMID:21806543, PMID:28264193]. SIN1's C-terminal pleckstrin-homology domain binds the PI3K product PtdIns(3,4,5)P3 to drive mTORC2 membrane localization and activation, linking PI3K to mTORC2 [PMID:26526694], while its Raf-like Ras-binding domain engages activated H- and K-Ras and suppresses Ras-driven ERK signaling, with the PH domain inhibiting Ras–SIN1 binding [PMID:17303383, PMID:35522713]. SIN1 activity is tuned by reciprocal phosphorylation: Akt phosphorylates SIN1 at T86 to create a positive feedback loop that amplifies mTORC2 activity and full Akt activation [PMID:26235620], whereas dual phosphorylation at T86 and T398 by Akt or S6K dissociates SIN1 from the complex as negative feedback, a control bypassed by the cancer-derived SIN1-R81T mutation that drives mTORC2 hyperactivation [PMID:24161930, PMID:24481632]. Through these mechanisms SIN1-mTORC2 governs cell survival, lymphocyte development and metabolism, and tumor cell invasion [PMID:30428057, PMID:30705387, PMID:28692058]. SIN1 additionally participates in mTORC2-independent activities, including a nuclear stress-response scaffolding role and regulation of cilia length [PMID:17054722, PMID:23727834].","teleology":[{"year":1999,"claim":"Before SIN1's mammalian role was known, fission yeast work first placed it as a scaffold acting downstream of a stress MAP kinase rather than as an upstream activator, framing SIN1 as a specificity factor in signaling.","evidence":"sin1 deletion, two-hybrid, and transcription reporter assays in S. pombe","pmids":["10428959"],"confidence":"Medium","gaps":["Did not connect SIN1 to TORC2 or to AGC-kinase phosphorylation","Mechanism of Atf1 stabilization not resolved"]},{"year":2006,"claim":"Established that SIN1 is an essential, mTORC2-specific subunit required for complex assembly and Akt Ser473 phosphorylation, defining its core function.","evidence":"sin1 knockout, reciprocal Co-IP, and in vivo/in vitro kinase assays in mammalian and Drosophila cells","pmids":["16962653","17043309"],"confidence":"High","gaps":["Did not identify which SIN1 domain recruits substrates","Did not explain how SIN1 connects to upstream PI3K input"]},{"year":2007,"claim":"Identified SIN1's RBD and PH domains, revealing it binds activated Ras and antagonizes Ras-driven ERK, JNK and Akt signaling, expanding SIN1 beyond mTORC2.","evidence":"domain analysis, Co-IP, co-localization, siRNA and overexpression","pmids":["17303383"],"confidence":"Medium","gaps":["Structural basis of Ras–SIN1 binding unresolved","Lipid specificity of the PH domain not defined"]},{"year":2008,"claim":"Showed SIN1 has cytoplasmic interactions beyond mTORC2 (PCBP2, IFNAR2, TNFα receptors) and is partitioned between nucleus and cytoplasm with rapamycin-sensitive dynamics, hinting at moonlighting and compartment-specific functions.","evidence":"two-hybrid, Co-IP, RNAi/apoptosis assays, and subcellular fractionation with rapamycin treatment","pmids":["18687895","18614546"],"confidence":"Medium","gaps":["Functional significance of receptor associations not mechanistically resolved","How nuclear SIN1 differs from cytoplasmic mTORC2 SIN1 unclear"]},{"year":2011,"claim":"Defined SIN1's central conserved region as the adaptor that directly binds substrate kinase domains (PKCε, Akt), explaining how mTORC2 selects its substrates.","evidence":"Co-IP, domain mapping, dominant-negative SIN1 mutants, and in vitro kinase assays","pmids":["21806543"],"confidence":"High","gaps":["Atomic structure of the substrate-binding region not yet determined","Whether binding mode is shared across all AGC substrates untested"]},{"year":2012,"claim":"Provided the first structural views of the SIN1 PH domain, predicting a phosphoinositide-binding site consistent with membrane targeting of TORC2.","evidence":"X-ray crystallography of human SIN1 and yeast Avo1 PH domains","pmids":["22505404"],"confidence":"Medium","gaps":["Phosphoinositide binding not functionally validated in this study","Membrane recruitment not directly demonstrated structurally"]},{"year":2013,"claim":"Established phosphorylation of SIN1 (T86/T398) as a negative feedback switch that dissociates SIN1 from mTORC2, and linked a cancer-derived R81T mutation to escape from this control and mTORC2 hyperactivation.","evidence":"phospho-site mutagenesis, Co-IP, in vitro kinase assays, and patient-mutation analysis","pmids":["24161930","24481632"],"confidence":"High","gaps":["Stoichiometry of dissociation in vivo not quantified","Phosphatase reversing these sites not identified"]},{"year":2013,"claim":"Revealed mTORC2-independent and stimulus-specific SIN1 functions: scaffolding ATF-2/p38 stress signaling, regulating cilia length via CCDC28B, coupling DNA-PKcs to UVB-induced Akt phosphorylation, and promoting EMT/invasion in HCC.","evidence":"Co-IP, RNAi, in vivo zebrafish/cell depletion, reporter and invasion assays across multiple studies","pmids":["17054722","23727834","24365180","23564492"],"confidence":"Medium","gaps":["Whether these roles require or bypass the mTORC2 complex not fully resolved for each","Direct vs indirect nature of some interactions untested"]},{"year":2015,"claim":"Resolved the kinase identity for the activating feedback loop, showing Akt (not S6K) phosphorylates SIN1 T86 to amplify mTORC2 toward full Akt activation, and provided direct evidence the PH domain binds PtdIns(3,4,5)P3 to link PI3K to mTORC2.","evidence":"orthogonal pharmacological inhibition with phospho-specific antibodies; lipid-binding and membrane-localization data","pmids":["26235620","26526694"],"confidence":"Medium","gaps":["Reconciliation of positive (Akt-T86) vs negative (T86/T398) feedback context-dependence incomplete","PI3K-link evidence cited via review commentary"]},{"year":2017,"claim":"Determined the SIN1 CRIM domain as a ubiquitin-like fold that confers substrate specificity rather than catalysis, and showed translational control of SIN1 by Pdcd4/eIF4A as a regulatory layer governing mTORC2 output and invasion.","evidence":"NMR structure with genetic rescue in fission yeast and mutagenesis; 5'UTR-luciferase reporter, Pdcd4 mutants, and silvestrol treatment","pmids":["28264193","28692058"],"confidence":"High","gaps":["How CRIM discriminates among different AGC substrates not fully defined","In vivo relevance of Pdcd4–SIN1 translational axis beyond cell models untested"]},{"year":2019,"claim":"Placed SIN1-mTORC2 in physiological control of lymphocyte development and metabolism, identifying downstream effectors (PPAR-γ/PKM2, c-Myc stability) that connect the complex to glycolysis and growth.","evidence":"conditional SIN1 knockout in T and B lineages, flow cytometry, glycolysis and proliferation assays, pathway analysis","pmids":["30428057","30705387","22678916"],"confidence":"Medium","gaps":["Direct biochemical link between SIN1 and PKM2/c-Myc not established","Tissue-specificity of effectors unclear"]},{"year":2022,"claim":"Provided atomic detail of the Ras–SIN1 RBD interface and showed the PH domain inhibits Ras binding, defining how SIN1 isoforms and conformations balance mTORC2 substrate activation against ERK suppression.","evidence":"X-ray crystallography of HRas/KRas–SIN1 RBD, interface mutagenesis, FRET competition, and SIN1 KO functional assays","pmids":["35522713"],"confidence":"High","gaps":["How PH-mediated autoinhibition is regulated in cells not resolved","Physiological isoform that engages Ras most strongly not defined"]},{"year":null,"claim":"How SIN1's multiple regulatory inputs — lipid binding, Ras engagement, dual feedback phosphorylation, isoform diversity, and translational control — are integrated to set mTORC2 activity in a context- and tissue-specific manner remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified structural model of full-length SIN1 within assembled mTORC2","Functional roles of most splice isoforms uncharacterized","Phosphatases and dissociation kinetics governing feedback not defined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,6]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[7,8,9]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,4]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[12,17,24]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[8]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[12,14]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,8,9]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,5,6]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[20,21]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[19,20]}],"complexes":["mTORC2"],"partners":["RICTOR","MTOR","AKT1","PRKCE","HRAS","KRAS","PCBP2","CCDC28B"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9BPZ7","full_name":"Target of rapamycin complex 2 subunit MAPKAP1","aliases":["Mitogen-activated protein kinase 2-associated protein 1","Stress-activated map kinase-interacting protein 1","SAPK-interacting protein 1","mSIN1"],"length_aa":522,"mass_kda":59.1,"function":"Component of the mechanistic target of rapamycin complex 2 (mTORC2), which transduces signals from growth factors to pathways involved in proliferation, cytoskeletal organization, lipogenesis and anabolic output (PubMed:15467718, PubMed:16919458, PubMed:16962653, PubMed:17043309, PubMed:21806543, PubMed:28264193, PubMed:28968999, PubMed:30837283, PubMed:35926713). In response to growth factors, mTORC2 phosphorylates and activates AGC protein kinase family members, including AKT (AKT1, AKT2 and AKT3), PKC (PRKCA, PRKCB and PRKCE) and SGK1 (PubMed:16919458, PubMed:16962653, PubMed:21806543, PubMed:28264193, PubMed:28968999, PubMed:30837283, PubMed:35926713). In contrast to mTORC1, mTORC2 is nutrient-insensitive (PubMed:16962653). Within the mTORC2 complex, MAPKAP1/SIN1 acts as a substrate adapter which recognizes and binds AGC protein kinase family members for phosphorylation by MTOR (PubMed:21806543, PubMed:28264193). mTORC2 plays a critical role in AKT1 activation by mediating phosphorylation of different sites depending on the context, such as 'Thr-450', 'Ser-473', 'Ser-477' or 'Thr-479', facilitating the phosphorylation of the activation loop of AKT1 on 'Thr-308' by PDPK1/PDK1 which is a prerequisite for full activation (PubMed:28264193, PubMed:35926713). mTORC2 catalyzes the phosphorylation of SGK1 at 'Ser-422' and of PRKCA on 'Ser-657' (PubMed:30837283, PubMed:35926713). The mTORC2 complex also phosphorylates various proteins involved in insulin signaling, such as FBXW8 and IGF2BP1 (By similarity). mTORC2 acts upstream of Rho GTPases to regulate the actin cytoskeleton, probably by activating one or more Rho-type guanine nucleotide exchange factors (PubMed:15467718). mTORC2 promotes the serum-induced formation of stress-fibers or F-actin (PubMed:15467718). MAPKAP1 inhibits MAP3K2 by preventing its dimerization and autophosphorylation (PubMed:15988011). Inhibits HRAS and KRAS independently of mTORC2 complex (PubMed:17303383, PubMed:34380736, PubMed:35522713). Enhances osmotic stress-induced phosphorylation of ATF2 and ATF2-mediated transcription (PubMed:17054722). Involved in ciliogenesis, regulates cilia length through its interaction with CCDC28B independently of mTORC2 complex (PubMed:23727834) In contrast to isoform 1, isoform 2 and isoform 6, isoform 4 is not a component of the a mTORC2 complex","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q9BPZ7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MAPKAP1","classification":"Not Classified","n_dependent_lines":212,"n_total_lines":1208,"dependency_fraction":0.17549668874172186},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"RICTOR","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/search/MAPKAP1","total_profiled":1310},"omim":[{"mim_id":"612190","title":"MTOR-ASSOCIATED PROTEIN LST8; MLST8","url":"https://www.omim.org/entry/612190"},{"mim_id":"611748","title":"OTU DOMAIN-CONTAINING 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[et al.]","url":"https://pubmed.ncbi.nlm.nih.gov/31831391","citation_count":25,"is_preprint":false},{"pmid":"22514319","id":"PMC_22514319","title":"Peroxynitrite donor SIN-1 alters high-affinity choline transporter activity by modifying its intracellular trafficking.","date":"2012","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/22514319","citation_count":25,"is_preprint":false},{"pmid":"7556414","id":"PMC_7556414","title":"Synergistic interaction of adenylate cyclase activators and nitric oxide donor SIN-1 on platelet cyclic AMP.","date":"1995","source":"European journal of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/7556414","citation_count":25,"is_preprint":false},{"pmid":"35522713","id":"PMC_35522713","title":"Structural insights into Ras regulation by SIN1.","date":"2022","source":"Proceedings of the National Academy of Sciences of the United States of 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function","url":"https://pubmed.ncbi.nlm.nih.gov/34927661","citation_count":21,"is_preprint":false},{"pmid":"18835362","id":"PMC_18835362","title":"Hemin-H2O2-NO2(-) induced protein oxidation and tyrosine nitration are different from those of SIN-1: a study on glutamate dehydrogenase nitrative/oxidative modification.","date":"2008","source":"The international journal of biochemistry & cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/18835362","citation_count":21,"is_preprint":false},{"pmid":"11429390","id":"PMC_11429390","title":"Relaxation to authentic nitric oxide and SIN-1 in rat isolated mesenteric arteries: variable role for smooth muscle hyperpolarization.","date":"2001","source":"British journal of pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/11429390","citation_count":21,"is_preprint":false},{"pmid":"36746125","id":"PMC_36746125","title":"MAPK/AP-1 Signaling Pathway Is Involved in the Protection Mechanism of Bone Marrow Mesenchymal Stem Cells-Derived Exosomes against Ultraviolet-Induced Photoaging in Human Dermal Fibroblasts.","date":"2023","source":"Skin pharmacology and physiology","url":"https://pubmed.ncbi.nlm.nih.gov/36746125","citation_count":20,"is_preprint":false},{"pmid":"31474086","id":"PMC_31474086","title":"Agastache rugosa Kuntze Attenuates UVB-Induced Photoaging in Hairless Mice through the Regulation of MAPK/AP-1 and TGF-β/ Smad Pathways.","date":"2019","source":"Journal of microbiology and biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/31474086","citation_count":20,"is_preprint":false},{"pmid":"8396690","id":"PMC_8396690","title":"Actions of 3-morpholinosydnonimin (SIN-1) on rabbit isolated penile erectile tissue.","date":"1993","source":"The Journal of urology","url":"https://pubmed.ncbi.nlm.nih.gov/8396690","citation_count":20,"is_preprint":false},{"pmid":"30847386","id":"PMC_30847386","title":"Nitidine Chloride Inhibits SIN1 Expression in Osteosarcoma Cells.","date":"2019","source":"Molecular therapy oncolytics","url":"https://pubmed.ncbi.nlm.nih.gov/30847386","citation_count":19,"is_preprint":false},{"pmid":"30571167","id":"PMC_30571167","title":"Sin1 (Stress-Activated Protein Kinase-Interacting Protein) Regulates Ischemia-Induced Microthrombosis Through Integrin αIIbβ3-Mediated Outside-In Signaling and Hypoxia Responses in Platelets.","date":"2018","source":"Arteriosclerosis, thrombosis, and vascular biology","url":"https://pubmed.ncbi.nlm.nih.gov/30571167","citation_count":19,"is_preprint":false},{"pmid":"27312213","id":"PMC_27312213","title":"Multiple Bcl-2 family immunomodulators from vaccinia virus regulate MAPK/AP-1 activation.","date":"2016","source":"The Journal of general virology","url":"https://pubmed.ncbi.nlm.nih.gov/27312213","citation_count":19,"is_preprint":false},{"pmid":"28858391","id":"PMC_28858391","title":"Pterocarpus santalinus L. Regulated Ultraviolet B Irradiation-induced Procollagen Reduction and Matrix Metalloproteinases Expression Through Activation of TGF-β/Smad and Inhibition of the MAPK/AP-1 Pathway in Normal Human Dermal Fibroblasts.","date":"2017","source":"Photochemistry and photobiology","url":"https://pubmed.ncbi.nlm.nih.gov/28858391","citation_count":19,"is_preprint":false},{"pmid":"37443304","id":"PMC_37443304","title":"Exploitation of ATP-sensitive potassium ion (KATP) channels by HPV promotes cervical cancer cell proliferation by contributing to MAPK/AP-1 signalling.","date":"2023","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/37443304","citation_count":19,"is_preprint":false},{"pmid":"36547926","id":"PMC_36547926","title":"Dieckol Isolated from Eisenia bicyclis Ameliorates Wrinkling and Improves Skin Hydration via MAPK/AP-1 and TGF-β/Smad Signaling Pathways in UVB-Irradiated Hairless Mice.","date":"2022","source":"Marine drugs","url":"https://pubmed.ncbi.nlm.nih.gov/36547926","citation_count":19,"is_preprint":false},{"pmid":"34208202","id":"PMC_34208202","title":"Santamarine Shows Anti-Photoaging Properties via Inhibition of MAPK/AP-1 and Stimulation of TGF-β/Smad Signaling in UVA-Irradiated HDFs.","date":"2021","source":"Molecules (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/34208202","citation_count":19,"is_preprint":false},{"pmid":"29088069","id":"PMC_29088069","title":"Refined Deep-Sea Water Suppresses Inflammatory Responses via the MAPK/AP-1 and NF-κB Signaling Pathway in LPS-Treated RAW 264.7 Macrophage Cells.","date":"2017","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/29088069","citation_count":19,"is_preprint":false},{"pmid":"30195253","id":"PMC_30195253","title":"Helianthus annuus L. flower prevents UVB-induced photodamage in human dermal fibroblasts by regulating the MAPK/AP-1, NFAT, and Nrf2 signaling pathways.","date":"2018","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/30195253","citation_count":19,"is_preprint":false},{"pmid":"12897410","id":"PMC_12897410","title":"Influence of the direct NO-donor SIN-1 on the interaction between platelets and stainless steel stents under dynamic conditions.","date":"2003","source":"Clinical hemorheology and microcirculation","url":"https://pubmed.ncbi.nlm.nih.gov/12897410","citation_count":19,"is_preprint":false},{"pmid":"22678916","id":"PMC_22678916","title":"Sin1 regulates Treg-cell development but is not required for T-cell growth and proliferation.","date":"2012","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/22678916","citation_count":18,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":54011,"output_tokens":6516,"usd":0.129886,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15428,"output_tokens":4424,"usd":0.09387,"stage2_stop_reason":"end_turn"},"total_usd":0.223756,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"SIN1/MIP1 (MAPKAP1) is an essential subunit of the mTORC2 (rictor-mTOR) complex. Genetic ablation of sin1 abolished Akt-Ser473 phosphorylation and disrupted rictor-mTOR interaction while maintaining Thr308 phosphorylation. Loss of Ser473 phosphorylation selectively affected FoxO1/3a but not TSC2, GSK3, S6K, or 4E-BP1, indicating SIN1-mTORC2 is required for cell survival but dispensable for mTORC1 function.\",\n      \"method\": \"Genetic ablation (sin1 knockout), immunoprecipitation, in vivo phosphorylation assays\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, genetic KO with specific phosphorylation readouts, replicated in multiple systems\",\n      \"pmids\": [\"16962653\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Sin1 is an essential component of mTORC2 but not mTORC1, required for mTORC2 complex formation, kinase activity toward Akt hydrophobic motif (Ser473), and Rictor-mTOR interaction. Sin1 knockdown decreases Akt phosphorylation in both Drosophila and mammalian cells. Disruption of Rictor in mice causes embryonic lethality and ablates Akt phosphorylation.\",\n      \"method\": \"RNAi knockdown in Drosophila and mammalian cells, Co-immunoprecipitation, in vitro kinase assay, Rictor knockout mice\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro kinase assay, genetic KO, RNAi in multiple organisms, reciprocal Co-IP; independently replicates PMID 16962653\",\n      \"pmids\": [\"17043309\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Akt (not S6K) is the major kinase responsible for phosphorylating SIN1 at T86 in all cell lines studied, creating a positive feedback loop: PDK1 phosphorylates Akt at T308 → Akt phosphorylates SIN1 at T86 → enhanced mTORC2 kinase activity → mTORC2 phosphorylates Akt at S473 for full Akt activation.\",\n      \"method\": \"Pharmacological inhibition of Akt, S6K, and mTOR; phospho-specific antibodies; multiple cell lines and conditions\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal inhibitors, multiple cell lines, specific phospho-site analysis contradicting prior claim\",\n      \"pmids\": [\"26235620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Phosphorylation of Sin1 at Thr86 and Thr398 by S6K or Akt (context-dependent) suppresses mTORC2 kinase activity by dissociating Sin1 from the mTORC2 complex, inhibiting Akt Ser473 phosphorylation. A cancer-patient-derived Sin1-R81T mutation impairs Sin1 T86 phosphorylation, leading to mTORC2 hyper-activation and enhanced Akt signaling.\",\n      \"method\": \"Phospho-site mutagenesis, Co-immunoprecipitation, in vitro kinase assay, patient-derived mutation analysis\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — mutagenesis, Co-IP, in vitro kinase assays, patient mutation validation, multiple orthogonal methods in single study\",\n      \"pmids\": [\"24161930\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Dual phosphorylation of Sin1 at T86 and T398 negatively regulates mTORC2 complex integrity and activity by causing Sin1 dissociation from the holo-enzyme, reducing Akt activity and sensitizing cells to apoptosis. The ovarian cancer-derived Sin1-R81T mutation abolishes S6K-mediated T86 phosphorylation, bypassing this negative regulation.\",\n      \"method\": \"Phospho-site mutagenesis, Co-immunoprecipitation, apoptosis assays, cancer patient mutation analysis\",\n      \"journal\": \"Protein & cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis and Co-IP data, single lab, corroborates PMID 24161930\",\n      \"pmids\": [\"24481632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The mTORC2 subunit Sin1 directly binds the PKCε kinase domain through Sin1's central conserved region, and serves as a selectivity adaptor for recruitment of mTORC2 substrates (both PKCε and PKB/Akt). Inducible expression of Sin1 mutants lacking the PKC-interaction domain disrupts PKC phosphorylation and suppresses PKB/Akt phosphorylation without affecting mTORC1 substrate p70S6K.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, inducible dominant-negative Sin1 mutant expression, in vitro kinase assay, 3D culture proliferation assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, domain mapping, multiple substrate readouts, dominant-negative approach with specific controls\",\n      \"pmids\": [\"21806543\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The conserved region in the middle of Sin1 (Sin1CRIM) forms a ubiquitin-like fold domain that specifically binds TORC2 substrate kinases (e.g., Gad8/SGK) to recruit them for phosphorylation; Sin1 is dispensable for TORC2 catalytic activity per se but essential for substrate specificity. Sin1CRIM fused to a different TORC2 subunit can rescue substrate phosphorylation in sin1-null fission yeast. The substrate-recognition function is conserved in human Sin1CRIM.\",\n      \"method\": \"NMR solution structure determination, genetic rescue in sin1 null fission yeast, Co-immunoprecipitation, mutagenesis of acidic loop\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structure with functional validation, mutagenesis, genetic rescue, conserved in human protein\",\n      \"pmids\": [\"28264193\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"X-ray crystal structures of the C-terminal pleckstrin homology (PH) domain of S. cerevisiae Avo1 (Sin1 orthologue) and human Sin1 were determined, revealing a PH domain fold with a putative phosphoinositide binding site, consistent with membrane localization of TORC2.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Acta crystallographica. Section F\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structures determined but functional validation of phosphoinositide binding not experimentally confirmed in this paper\",\n      \"pmids\": [\"22505404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The PH domain of SIN1 directly binds the PI3K lipid product PtdIns(3,4,5)P3 to promote mTORC2 kinase activation and membrane localization, providing a mechanistic link between PI3K and mTORC2.\",\n      \"method\": \"Lipid binding assay, membrane localization experiments (referenced review summarizing Liu et al. experimental findings)\",\n      \"journal\": \"Cancer discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — described in review commentary, references primary experimental data from Liu et al.; indirect citation\",\n      \"pmids\": [\"26526694\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Human Sin1 contains a functional Raf-like Ras-binding domain (RBD) and a pleckstrin homology (PH) domain. The PH domain mediates lipid and membrane binding; the RBD binds activated H- and K-Ras. Sin1 and Ras co-immunoprecipitate and co-localize in vivo. Overexpression of Sin1 inhibits ERK, Akt, and JNK activation by Ras, while siRNA knockdown of Sin1 enhances Ras-induced ERK1/2 activation.\",\n      \"method\": \"Domain functional analysis, co-immunoprecipitation, co-localization imaging, siRNA knockdown, overexpression studies\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, co-localization, RNAi and overexpression, single lab\",\n      \"pmids\": [\"17303383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"High-resolution crystal structures of HRas/KRas-SIN1 RBD complexes revealed the detailed interaction interface. Mutation of critical interface residues abolished Ras-SIN1 interaction. In SIN1 knockout cells, Ras-SIN1 association promotes SGK1 activity but inhibits insulin-induced ERK activation. The SIN1 PH domain has an inhibitory effect on Ras-SIN1 binding; a SIN1 isoform lacking the PH domain binds Ras more strongly.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, FRET competition assay, SIN1 knockout cell lines, kinase activity assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with mutagenesis validation, FRET assay, KO cell functional readout, multiple orthogonal methods\",\n      \"pmids\": [\"35522713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SIN1 (MAPKAP1) interacts with poly(rC) binding protein 2 (PCBP2) through its N-terminal domain; PCBP2 and SIN1 can be co-immunoprecipitated together with the cytoplasmic domain of the IFN receptor IFNAR2 from HeLa cells. SIN1 also associates with TNFα receptors. RNAi silencing of either SIN1 or PCBP2 renders cells sensitive to basal and stress-induced apoptosis.\",\n      \"method\": \"Two-hybrid screen, co-immunoprecipitation, RNAi knockdown, apoptosis assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — yeast two-hybrid, Co-IP with IFNAR2, RNAi functional rescue, single lab\",\n      \"pmids\": [\"18687895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"mTOR, mLST8, rictor, and Sin1 are less abundant in the nucleus than the cytoplasm of primary human fibroblasts. The mTOR/rictor complex is abundant in both compartments. Short-term rapamycin treatment triggers dephosphorylation of rictor and Sin1 exclusively in the cytoplasm without affecting mTORC2 assembly; prolonged rapamycin leads to complete dephosphorylation and cytoplasmic translocation of nuclear rictor and Sin1 accompanied by inhibition of mTORC2 assembly.\",\n      \"method\": \"Subcellular fractionation, immunofluorescence, Western blot, rapamycin treatment\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — fractionation with functional consequence (mTORC2 assembly inhibition), multiple conditions, single lab\",\n      \"pmids\": [\"18614546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Fission yeast Sin1 interacts with the Sty1/Spc1 SAPK MAP kinase. Cells lacking Sin1 display stress sensitivity and cell-cycle delay similar to sty1/spc1 deletion but Sin1 is not required for Sty1/Spc1 activation; rather Sin1 is required downstream for stress-dependent phosphorylation and stabilization of the transcription factor Atf1 and for transcription via the AP-1 factor Pap1.\",\n      \"method\": \"Genetic interaction (sin1 deletion), two-hybrid interaction, stress assays, kinase activity assays, transcription reporter assays, chimeric rescue constructs\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis, two-hybrid, multiple phenotypic readouts, foundational study in fission yeast orthologue\",\n      \"pmids\": [\"10428959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Mammalian Sin1 directly binds both ATF-2 and p38. Sin1 overexpression enhances osmotic stress-induced phosphorylation of ATF-2 and ATF-2-mediated transcription; siRNA knockdown of Sin1 suppresses these responses and inhibits osmotic stress-induced apoptosis and Gadd45β expression. Sin1 functions as a nuclear scaffold to promote ATF-2 signaling specificity under stress but not serum stimulation.\",\n      \"method\": \"Co-immunoprecipitation (direct binding), siRNA knockdown, overexpression, transcription reporter assay, apoptosis assay\",\n      \"journal\": \"Genes to cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding by Co-IP, RNAi with specific transcriptional and apoptotic readouts, single lab\",\n      \"pmids\": [\"17054722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SIN1 promotes invasion and metastasis of hepatocellular carcinoma by facilitating epithelial-mesenchymal transition (EMT); depletion of SIN1 significantly decreases invasion and migration of HCC cell lines.\",\n      \"method\": \"siRNA knockdown, invasion/migration assays, EMT marker analysis (Western blot, qPCR), immunohistochemistry\",\n      \"journal\": \"Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — KD with specific cellular phenotype (invasion/EMT markers), single lab\",\n      \"pmids\": [\"23564492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Tumor suppressor Pdcd4 inhibits Sin1 translation through an eIF4A-dependent mechanism acting on the SIN1 5'UTR. Loss of Pdcd4 increases Sin1 protein (not mRNA), enhancing mTORC2 activity and invasion. Pdcd4 mutants unable to bind eIF4A fail to inhibit Sin1 translation, mTORC2 activity, or invasion. Direct eIF4A inhibition with silvestrol suppresses Sin1 translation.\",\n      \"method\": \"5'UTR-luciferase reporter assay, Pdcd4 knockdown/knockout/rescue, eIF4A binding mutants, silvestrol treatment, invasion assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — luciferase reporter with 5'UTR, multiple Pdcd4 mutants, pharmacological validation, multiple orthogonal methods in single study\",\n      \"pmids\": [\"28692058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"DNA-PKcs associates with SIN1 in the cytosol upon UVB radiation in an EGFR-activation-dependent manner. This DNA-PKcs-SIN1 complexation is required for UVB-induced Akt Ser473 phosphorylation by mTORC2. Inhibition or depletion of either DNA-PKcs or SIN1 abolishes UVB-induced Akt Ser473 phosphorylation and enhances UVB-induced apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, dominant-negative kinase-dead mutation, gene depletion, EGFR inhibitor treatment, apoptosis assays\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, genetic and pharmacological perturbation, multiple readouts, single lab\",\n      \"pmids\": [\"24365180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CCDC28B interacts with SIN1 (a component of mTORC2) and this interaction is important both for mTOR signaling and for a mTORC-independent role of SIN1 in cilia length regulation. Depletion of CCDC28B reduces cilia length in vivo at least partly through its interaction with Sin1. Depletion of Rictor (another mTORC2 component) does not affect cilia length, indicating a specific Sin1 function independent of the full mTORC2 complex.\",\n      \"method\": \"Co-immunoprecipitation, in vivo zebrafish/cell depletion, cilia length measurement, Rictor vs Sin1 knockdown comparison\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, in vivo genetic evidence, specific separation-of-function vs Rictor, single lab\",\n      \"pmids\": [\"23727834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Sin1-mTORC2 controls early thymocyte (DN stage) development and glycolysis through an AKT-dependent PPAR-γ nuclear translocation pathway that controls PKM2 (pyruvate kinase M2) expression. Sin1 knockout in T lineage cells severely impairs DN thymocyte proliferation and glycolysis; PKM2 is identified as a novel Sin1 effector.\",\n      \"method\": \"Conditional Sin1 knockout in T cells, flow cytometry, glycolysis assays, PPAR-γ nuclear translocation analysis, PKM2 expression analysis\",\n      \"journal\": \"Journal of molecular cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with specific metabolic and developmental phenotype, pathway placement, single lab\",\n      \"pmids\": [\"30428057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Sin1-mTORC2 regulates B cell growth and metabolism by maintaining c-Myc protein stability and activating mTORC1 through Akt-dependent inactivation of GSK3 and TSC1/2. Genetic ablation of Sin1 in B cells reduces cell size, impairs metabolism, proliferation, antibody responses, and anti-viral immunity.\",\n      \"method\": \"B cell-specific Sin1 conditional knockout, flow cytometry, proliferation assays, mTORC1/2 pathway analysis, c-Myc stability assay\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with specific immunological and molecular phenotypes, pathway placement, single lab\",\n      \"pmids\": [\"30705387\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Sin1 deficiency blocks mTORC2-dependent Akt phosphorylation in T cells. Sin1 is dispensable for T-cell receptor-induced growth, proliferation, and CD4+ helper cell differentiation, but Sin1 deficiency increases the proportion of Foxp3+ natural T-regulatory cells in the thymus. TGF-β-dependent Treg differentiation in vitro is enhanced by mTOR inhibition but not by loss of Sin1.\",\n      \"method\": \"Sin1 conditional knockout in hematopoietic system, flow cytometry, in vitro T cell differentiation assays, Akt phosphorylation analysis\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with specific immunological readouts, separation of Sin1 vs mTOR functions, single lab\",\n      \"pmids\": [\"22678916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Sin1 T86 phosphorylation amplifies mTORC2-mediated downstream signals and is required for integrin αIIbβ3-mediated outside-in signaling in platelets, as well as hypoxia/ROS responses through the NAD+/Sirt3/SOD2 pathway. Platelet-specific Sin1 deficiency protects mice from ischemia-induced microvascular embolization and heart dysfunction after myocardial infarction.\",\n      \"method\": \"Platelet-specific Sin1 knockout mice, Sin1 T86 phosphorylation-deficient knockin mice, platelet activation assays, mouse myocardial infarction model\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO and phospho-mutant knockin mice, in vivo disease model, multiple mechanistic readouts, single lab\",\n      \"pmids\": [\"30571167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The human Sin1 gene (MAPKAP1) produces transcripts utilizing alternative polyadenylation signals and multiple splice variants that potentially encode functionally different isoforms. A highly conserved domain shared with S. pombe Sin1, Dictyostelium RIP3, and S. cerevisiae Avo1 was identified as defining the SIN1 orthologue family.\",\n      \"method\": \"Cloning and characterization of full-length human Sin1 mRNA, RT-PCR, sequence analysis\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — mRNA cloning and sequence characterization, no functional validation of isoforms\",\n      \"pmids\": [\"15363842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Sin1γ, a novel Sin1 isoform with a C-terminal truncation due to alternative 3' termination, can interact with mTORC2 components but its overexpression in Sin1-deficient MEFs has no significant impact on mTORC2 activity or subunit levels. Sin1γ localizes to a specific cytosolic location and its localization is transiently disrupted during the cell cycle.\",\n      \"method\": \"Isoform cloning, overexpression in Sin1-deficient MEFs, mTORC2 activity assay, subcellular localization imaging, cell cycle analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — functional characterization in KO cells with specific readouts, localization imaging, single lab\",\n      \"pmids\": [\"26263164\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MAPKAP1 (SIN1) is an essential scaffold subunit of mTORC2 that maintains complex integrity through direct association with rictor and mTOR, recruits AGC kinase substrates (Akt, PKCε, SGK1) via its ubiquitin-fold CRIM domain, connects mTORC2 to PI3K signaling through its PH domain's binding of PtdIns(3,4,5)P3, and suppresses Ras-ERK signaling through its RBD; SIN1 phosphorylation at T86 and T398 by Akt or S6K dissociates SIN1 from mTORC2 to negatively regulate complex activity in a feedback manner, while Akt-mediated T86 phosphorylation also creates a positive feedback loop that amplifies mTORC2 activity and full Akt activation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MAPKAP1 (SIN1) is an essential scaffold subunit of mTORC2 that defines the complex's substrate specificity and couples it to upstream lipid and Ras signaling [#0, #1]. Genetic ablation of SIN1 disrupts the rictor–mTOR interaction and abolishes Akt Ser473 (hydrophobic motif) phosphorylation while leaving Thr308 and mTORC1 outputs intact, establishing SIN1 as required for mTORC2 assembly and activity but dispensable for mTORC1 [#0, #1]. The conserved central CRIM region adopts a ubiquitin-like fold that directly binds AGC-family substrate kinases including PKCε and SGK/Akt to recruit them for phosphorylation; SIN1 is dispensable for catalysis per se but essential for substrate selection, a function conserved from fission yeast to human [#5, #6]. SIN1's C-terminal pleckstrin-homology domain binds the PI3K product PtdIns(3,4,5)P3 to drive mTORC2 membrane localization and activation, linking PI3K to mTORC2 [#8], while its Raf-like Ras-binding domain engages activated H- and K-Ras and suppresses Ras-driven ERK signaling, with the PH domain inhibiting Ras–SIN1 binding [#9, #10]. SIN1 activity is tuned by reciprocal phosphorylation: Akt phosphorylates SIN1 at T86 to create a positive feedback loop that amplifies mTORC2 activity and full Akt activation [#2], whereas dual phosphorylation at T86 and T398 by Akt or S6K dissociates SIN1 from the complex as negative feedback, a control bypassed by the cancer-derived SIN1-R81T mutation that drives mTORC2 hyperactivation [#3, #4]. Through these mechanisms SIN1-mTORC2 governs cell survival, lymphocyte development and metabolism, and tumor cell invasion [#19, #20, #16]. SIN1 additionally participates in mTORC2-independent activities, including a nuclear stress-response scaffolding role and regulation of cilia length [#14, #18].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Before SIN1's mammalian role was known, fission yeast work first placed it as a scaffold acting downstream of a stress MAP kinase rather than as an upstream activator, framing SIN1 as a specificity factor in signaling.\",\n      \"evidence\": \"sin1 deletion, two-hybrid, and transcription reporter assays in S. pombe\",\n      \"pmids\": [\"10428959\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not connect SIN1 to TORC2 or to AGC-kinase phosphorylation\", \"Mechanism of Atf1 stabilization not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that SIN1 is an essential, mTORC2-specific subunit required for complex assembly and Akt Ser473 phosphorylation, defining its core function.\",\n      \"evidence\": \"sin1 knockout, reciprocal Co-IP, and in vivo/in vitro kinase assays in mammalian and Drosophila cells\",\n      \"pmids\": [\"16962653\", \"17043309\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify which SIN1 domain recruits substrates\", \"Did not explain how SIN1 connects to upstream PI3K input\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified SIN1's RBD and PH domains, revealing it binds activated Ras and antagonizes Ras-driven ERK, JNK and Akt signaling, expanding SIN1 beyond mTORC2.\",\n      \"evidence\": \"domain analysis, Co-IP, co-localization, siRNA and overexpression\",\n      \"pmids\": [\"17303383\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of Ras–SIN1 binding unresolved\", \"Lipid specificity of the PH domain not defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed SIN1 has cytoplasmic interactions beyond mTORC2 (PCBP2, IFNAR2, TNFα receptors) and is partitioned between nucleus and cytoplasm with rapamycin-sensitive dynamics, hinting at moonlighting and compartment-specific functions.\",\n      \"evidence\": \"two-hybrid, Co-IP, RNAi/apoptosis assays, and subcellular fractionation with rapamycin treatment\",\n      \"pmids\": [\"18687895\", \"18614546\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional significance of receptor associations not mechanistically resolved\", \"How nuclear SIN1 differs from cytoplasmic mTORC2 SIN1 unclear\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined SIN1's central conserved region as the adaptor that directly binds substrate kinase domains (PKCε, Akt), explaining how mTORC2 selects its substrates.\",\n      \"evidence\": \"Co-IP, domain mapping, dominant-negative SIN1 mutants, and in vitro kinase assays\",\n      \"pmids\": [\"21806543\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure of the substrate-binding region not yet determined\", \"Whether binding mode is shared across all AGC substrates untested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Provided the first structural views of the SIN1 PH domain, predicting a phosphoinositide-binding site consistent with membrane targeting of TORC2.\",\n      \"evidence\": \"X-ray crystallography of human SIN1 and yeast Avo1 PH domains\",\n      \"pmids\": [\"22505404\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphoinositide binding not functionally validated in this study\", \"Membrane recruitment not directly demonstrated structurally\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established phosphorylation of SIN1 (T86/T398) as a negative feedback switch that dissociates SIN1 from mTORC2, and linked a cancer-derived R81T mutation to escape from this control and mTORC2 hyperactivation.\",\n      \"evidence\": \"phospho-site mutagenesis, Co-IP, in vitro kinase assays, and patient-mutation analysis\",\n      \"pmids\": [\"24161930\", \"24481632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of dissociation in vivo not quantified\", \"Phosphatase reversing these sites not identified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Revealed mTORC2-independent and stimulus-specific SIN1 functions: scaffolding ATF-2/p38 stress signaling, regulating cilia length via CCDC28B, coupling DNA-PKcs to UVB-induced Akt phosphorylation, and promoting EMT/invasion in HCC.\",\n      \"evidence\": \"Co-IP, RNAi, in vivo zebrafish/cell depletion, reporter and invasion assays across multiple studies\",\n      \"pmids\": [\"17054722\", \"23727834\", \"24365180\", \"23564492\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether these roles require or bypass the mTORC2 complex not fully resolved for each\", \"Direct vs indirect nature of some interactions untested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Resolved the kinase identity for the activating feedback loop, showing Akt (not S6K) phosphorylates SIN1 T86 to amplify mTORC2 toward full Akt activation, and provided direct evidence the PH domain binds PtdIns(3,4,5)P3 to link PI3K to mTORC2.\",\n      \"evidence\": \"orthogonal pharmacological inhibition with phospho-specific antibodies; lipid-binding and membrane-localization data\",\n      \"pmids\": [\"26235620\", \"26526694\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reconciliation of positive (Akt-T86) vs negative (T86/T398) feedback context-dependence incomplete\", \"PI3K-link evidence cited via review commentary\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Determined the SIN1 CRIM domain as a ubiquitin-like fold that confers substrate specificity rather than catalysis, and showed translational control of SIN1 by Pdcd4/eIF4A as a regulatory layer governing mTORC2 output and invasion.\",\n      \"evidence\": \"NMR structure with genetic rescue in fission yeast and mutagenesis; 5'UTR-luciferase reporter, Pdcd4 mutants, and silvestrol treatment\",\n      \"pmids\": [\"28264193\", \"28692058\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CRIM discriminates among different AGC substrates not fully defined\", \"In vivo relevance of Pdcd4–SIN1 translational axis beyond cell models untested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed SIN1-mTORC2 in physiological control of lymphocyte development and metabolism, identifying downstream effectors (PPAR-γ/PKM2, c-Myc stability) that connect the complex to glycolysis and growth.\",\n      \"evidence\": \"conditional SIN1 knockout in T and B lineages, flow cytometry, glycolysis and proliferation assays, pathway analysis\",\n      \"pmids\": [\"30428057\", \"30705387\", \"22678916\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical link between SIN1 and PKM2/c-Myc not established\", \"Tissue-specificity of effectors unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided atomic detail of the Ras–SIN1 RBD interface and showed the PH domain inhibits Ras binding, defining how SIN1 isoforms and conformations balance mTORC2 substrate activation against ERK suppression.\",\n      \"evidence\": \"X-ray crystallography of HRas/KRas–SIN1 RBD, interface mutagenesis, FRET competition, and SIN1 KO functional assays\",\n      \"pmids\": [\"35522713\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PH-mediated autoinhibition is regulated in cells not resolved\", \"Physiological isoform that engages Ras most strongly not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How SIN1's multiple regulatory inputs — lipid binding, Ras engagement, dual feedback phosphorylation, isoform diversity, and translational control — are integrated to set mTORC2 activity in a context- and tissue-specific manner remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified structural model of full-length SIN1 within assembled mTORC2\", \"Functional roles of most splice isoforms uncharacterized\", \"Phosphatases and dissociation kinetics governing feedback not defined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [7, 8, 9]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 4]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [12, 17, 24]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [12, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 8, 9]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 5, 6]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [20, 21]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [19, 20]}\n    ],\n    \"complexes\": [\"mTORC2\"],\n    \"partners\": [\"RICTOR\", \"MTOR\", \"AKT1\", \"PRKCE\", \"HRAS\", \"KRAS\", \"PCBP2\", \"CCDC28B\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}