{"gene":"MAP3K11","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1996,"finding":"MLK3 directly phosphorylates and activates SEK1/MKK4 and MKK3/6 in vitro, selectively activating the SAPK/JNK and p38/RK pathways but not ERKs. Co-precipitation experiments demonstrated physical interactions between MLK3 and SEK1, and between MLK3 and MKK6.","method":"In vitro kinase assay (immunoprecipitated MLK3 phosphorylating SEK1), co-transfection, co-precipitation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1/2 / Strong — in vitro kinase assay combined with co-precipitation and transfection, replicated across two independent labs (PMID:9003778 and PMID:8702571)","pmids":["9003778","8702571"],"is_preprint":false},{"year":1994,"finding":"MLK3/SPRK/PTK1 is a serine/threonine kinase with an N-terminal SH3 domain, a kinase catalytic domain with mixed-lineage homology, tandem leucine/isoleucine zippers, a Cdc42/Rac-binding (CRIB) motif, and a proline-rich C-terminal region. Epitope-tagged SPRK autophosphorylates on serine and threonine; point mutations in the ATP-binding site abolish phosphorylation.","method":"cDNA cloning, domain analysis, in vitro kinase assay, site-directed mutagenesis of ATP-binding site","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted kinase activity with active-site mutagenesis; independently cloned in two labs (PMID:8195146, PMID:8183572, PMID:8108137)","pmids":["8195146","8183572","8108137"],"is_preprint":false},{"year":1998,"finding":"MLK3 forms disulfide-bridged homodimers through its tandem leucine zipper (LZ) motif; dimerization is required for MLK3 autophosphorylation and subsequent SAPK/JNK activation. Co-expression of activated Cdc42 substantially increases MLK3 dimerization. An LZ-deletion mutant fails to activate SAPK.","method":"Co-immunoprecipitation, non-reducing SDS-PAGE, co-expression with Cdc42, dominant-negative LZ polypeptide expression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and non-reducing PAGE with multiple genetic constructs in single lab","pmids":["9829970"],"is_preprint":false},{"year":2000,"finding":"Cdc42 activates MLK3/SPRK via its functional CRIB motif, altering MLK3 in vivo serine/threonine phosphorylation pattern. Unlike PAK, Cdc42-mediated activation of SPRK cannot be recapitulated in vitro with purified proteins, suggesting additional cellular components are required.","method":"Site-directed mutagenesis of CRIB motif, co-expression with activated Cdc42, comparative phosphopeptide mapping, in vitro kinase assay (negative result for recapitulation)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1/2 / Moderate — mutagenesis, phosphopeptide mapping, and in vitro assay in single lab","pmids":["10799501"],"is_preprint":false},{"year":2000,"finding":"Zipper-mediated MLK3/SPRK oligomerization is not required for Cdc42-induced autophosphorylation or histone kinase activity, but is essential for activation of JNK via MKK4. A monomeric SPRK zipper mutant (L410P) fails to phosphorylate the activating Thr258 residue of MKK4, showing that oligomerization is required for proper interaction with the downstream substrate MKK4.","method":"Site-directed mutagenesis of leucine zipper (L410P), in vitro kinase assay, JNK activation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and defined substrate phosphorylation site, single lab","pmids":["10862766"],"is_preprint":false},{"year":2002,"finding":"Ceramide and TNF-α are agonists of MLK3: a ceramide analog and bacterial sphingomyelinase activate MLK3 in vivo, and natural ceramide activates MLK3 in vitro at low nanomolar concentrations. Specific inhibition of MLK3 attenuates ceramide-induced JNK activation without affecting p38 or ERK.","method":"In vivo kinase assays, in vitro kinase assay with natural ceramide, pharmacological inhibition","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1/2 / Moderate — in vitro and in vivo kinase assays with multiple orthogonal approaches in single study","pmids":["12504027"],"is_preprint":false},{"year":2002,"finding":"MLK3 in vivo phosphorylation sites identified by mass spectrometry and phosphopeptide mapping include Ser524, Ser555, Ser556, Ser654, Ser705, Ser724, Ser727, Ser740, Ser758, Ser770, Ser793, and a site in Ser11-Arg37. Activated Cdc42 specifically induces phosphorylation of Ser555 and Ser556.","method":"Mass spectrometry, C18 reverse-phase HPLC, porous graphitic carbon chromatography, MALDI-MS, 2D phosphopeptide mapping, alkaline phosphatase treatment","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mass spectrometry with multiple complementary chromatographic methods and confirmatory 2D mapping","pmids":["11969422"],"is_preprint":false},{"year":2003,"finding":"Endogenous MLK3 localizes near centrosomes during interphase, disperses away transiently at G2/M, and has enhanced phosphorylation and activity during G2/M when JNK remains inactive. Overexpressed MLK3 disrupts cytoplasmic microtubules (like NIMA). MLK3 siRNA depletion increases sensitivity to taxol, indicating a role in promoting microtubule instability at M-phase entry.","method":"Immunofluorescence localization of endogenous MLK3, cell-cycle synchronization, kinase activity assays, siRNA knockdown, taxol sensitivity assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2/3 / Moderate — localization with functional consequence (taxol sensitivity), multiple methods in single lab","pmids":["12529434"],"is_preprint":false},{"year":2004,"finding":"MLK3 is required for mitogen- and cytokine-stimulated phosphorylation of B-Raf at Thr598/Ser601, a step required for B-Raf activation and downstream ERK signaling. RNAi silencing of MLK3 suppresses JNK, ERK, and p38 activation and blocks serum-stimulated cell proliferation. Tumor cells with activating B-Raf or Raf-1 mutations are unaffected by MLK3 silencing, placing MLK3 upstream of B-Raf.","method":"RNAi knockdown, phospho-specific immunoblotting, proliferation assays, genetic epistasis with B-Raf/Raf-1 mutant cell lines","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNAi with defined phosphorylation readout, epistasis with multiple cell lines, replicated in companion paper PMID:15467451","pmids":["15258589","15467451"],"is_preprint":false},{"year":2005,"finding":"MLK3 deficiency in mice causes a selective reduction in TNF-stimulated JNK activation but no major defects in other MAPK signaling (ERK, p38), establishing that MLK3 contributes specifically to the TNF→JNK pathway in primary embryonic fibroblasts.","method":"Targeted gene disruption (Mlk3−/− mice), primary embryonic fibroblast stimulation, immunoblotting of MAPK phosphorylation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean genetic KO with specific signaling readout, multiple MAPK pathways tested","pmids":["15831472"],"is_preprint":false},{"year":2008,"finding":"MLK3 binds directly to the Rho activator p63RhoGEF/GEFT, preventing its activation by Gαq and thereby limiting Rho activation. This scaffolding function is independent of MLK3 kinase activity and is required for cell migration.","method":"Co-immunoprecipitation, kinase-dead MLK3 rescue experiments, Rho activity assays, cell migration assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP with kinase-dead mutant establishing scaffold function, multiple orthogonal assays","pmids":["18851832"],"is_preprint":false},{"year":2009,"finding":"TRAF2 directly interacts with MLK3 and is required for TNF-α-induced MLK3 activation. The TRAF domain of TRAF2 mediates the interaction, and the C-terminal half (aa 511–847) of MLK3 is the TRAF2-binding region. Endogenous TRAF2 and MLK3 associate in a TNF-α time-dependent manner; competition with a TRAF2 deletion mutant attenuates MLK3 kinase activity and downstream JNK activation.","method":"Co-immunoprecipitation, domain mapping, kinase activity assays, dominant-negative TRAF2 competition","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP with domain mapping and functional kinase activity readout, single lab","pmids":["19918265"],"is_preprint":false},{"year":2010,"finding":"AKT1/2 phosphorylates MLK3 at Ser674, which inhibits MLK3 kinase activity in ER+ breast cancer cells. Estrogen (E2) activates AKT via ERα-PI3K interaction, leading to MLK3 Ser674 phosphorylation and suppression of MLK3-JNK pro-apoptotic signaling.","method":"Site-directed phosphorylation site analysis, AKT knockdown, kinase activity assays, immunoblotting","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific phosphorylation site identified with knockdown rescue, single lab","pmids":["20145118"],"is_preprint":false},{"year":2011,"finding":"MLK3 functions downstream of FGD1/CDC42 in osteoblasts to regulate ERK and p38 MAPK, which phosphorylate Runx2 to control osteoblast differentiation. Mlk3−/− mice display skeletal defects mirroring Aarskog syndrome; a CDC42-resistant MLK3 knockin allele produces the same defects, demonstrating that CDC42 activation of MLK3 is specifically required for skeletal mineralization.","method":"Targeted gene disruption (Mlk3−/−), knockin of CDC42-resistant Mlk3 allele, phospho-MAPK immunoblotting, skeletal phenotype analysis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO and knockin genetic epistasis, multiple orthogonal methods, consistent phenotype","pmids":["21965325"],"is_preprint":false},{"year":2012,"finding":"MLK3 promotes phosphorylation of the focal adhesion scaffold paxillin at Ser178 (via JNK) and Tyr118, limiting Rho activity to promote focal adhesion turnover and cell migration. MLK3 silencing increases focal adhesions and stress fibers, and reduces breast cancer lung metastasis in vivo.","method":"RNAi knockdown, pharmacological inhibition, paxillin S178A mutant expression, Rho activity assay, in vivo metastasis model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — RNAi + mutant rescue + in vivo validation, multiple orthogonal methods","pmids":["22700880"],"is_preprint":false},{"year":2013,"finding":"MLK3 promotes saturated fatty acid-induced JNK activation in macrophages in vitro and in vivo. MLK3-deficient mice on high-fat diet show decreased adiposity, attenuated JNK activation, reduced macrophage infiltration, and improved insulin resistance, demonstrating MLK3's role in diet-induced metabolic dysfunction.","method":"MLK3 knockout mice, high-fat diet model, JNK activation assays, macrophage polarization, in vitro palmitate stimulation","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO with in vivo and in vitro orthogonal assays, single lab","pmids":["23860122"],"is_preprint":false},{"year":2010,"finding":"GSK-3β inactivation disrupts MLK3 dimerization-induced autophosphorylation in microglia, blocking the MLK3→MKK4→JNK signaling cascade and reducing LPS-induced TNF-α production. Co-immunoprecipitation demonstrated a functional interaction between MLK3 and GSK-3β.","method":"Co-immunoprecipitation, GSK-3β inhibitors and siRNA, ELISA, western blotting, NF-κB reporter assay","journal":"Journal of neuroinflammation","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single co-IP with pharmacological and genetic inhibition, multiple readouts","pmids":["21194439"],"is_preprint":false},{"year":2014,"finding":"MLK3 is part of a positive feedback loop with ERK and JNK: low ROS preferentially activates ERK while high ROS activates JNK via MLK3. MLK3 knockdown or inhibition shifts ROS-induced responses toward ERK activation and reduces cell death, establishing MLK3 as a critical switch between proliferative and apoptotic ROS responses.","method":"Mathematical modeling, MLK3 knockdown, MLK3 inhibitor, phospho-ERK/JNK immunoblotting, cell viability assays","journal":"Science signaling","confidence":"Medium","confidence_rationale":"Tier 2/3 / Moderate — RNAi knockdown with mathematical modeling and pharmacological validation, single lab","pmids":["24894995"],"is_preprint":false},{"year":2017,"finding":"MLK3 phosphorylation by ERK1/2 at Ser705 and Ser758 promotes MLK3-dependent B-Raf and ERK1/2 activation, creating a positive feedback loop that enhances oxidative stress-induced colorectal cancer cell invasion. Active ERK1 phosphorylates kinase-dead MLK3 in vitro; the S705A/S758A mutant shows reduced ERK1/2 activation and decreased interaction with B-Raf.","method":"In vitro kinase assay (ERK1 phosphorylating kinase-dead MLK3), co-immunoprecipitation, site-directed mutagenesis (S705A/S758A), invasion assay, siRNA knockdown","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1/2 / Moderate — in vitro kinase assay with mutagenesis, co-IP, and functional invasion readout, single lab","pmids":["29084209"],"is_preprint":false},{"year":2018,"finding":"IFN-γ receptor stimulation activates ULK1, which interacts with MLK3 and is required for MLK3 phosphorylation and downstream ERK5 activation. This ULK1-MLK3-ERK5 axis promotes transcription of antiviral IFN-stimulated genes independently of ULK1's autophagy function.","method":"Co-immunoprecipitation (ULK1-MLK3 interaction), phosphorylation assays, ERK5 activation assays, IFN-stimulated gene expression","journal":"Science signaling","confidence":"Medium","confidence_rationale":"Tier 2/3 / Moderate — co-IP with functional signaling and transcriptional readouts, single lab","pmids":["30459284"],"is_preprint":false},{"year":2015,"finding":"HER2 suppresses MLK3 kinase activity in HER2+ breast cancer via AKT-mediated phosphorylation of MLK3 at Ser674. HER2 depletion or treatment with trastuzumab/lapatinib stimulates MLK3 activity; PI3K/AKT inhibitors block this effect. MLK3 knockdown blunts pro-apoptotic effects of HER2-targeted therapies.","method":"Kinase activity assays in HER2+ tumor tissues and cell lines, HER2/HER3 siRNA, trastuzumab/lapatinib treatment, PI3K/AKT inhibition, MLK3 stable knockdown","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined phosphorylation site (Ser674) with multiple pharmacological and genetic interventions, single lab","pmids":["26152725"],"is_preprint":false},{"year":2015,"finding":"MLK3 directly phosphorylates AMPKα1 at Thr172 independently of LKB1. GST pull-down assays demonstrate direct interaction between AMPKα1 and MLK3. MLK3-mediated AMPK phosphorylation is AMP-independent.","method":"In vitro kinase assay, GST pull-down, LKB1-deficient cell lines, AMPK phosphorylation at T172","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 1/3 / Moderate — in vitro kinase assay and GST pull-down, single lab","pmids":["25874865"],"is_preprint":false},{"year":2017,"finding":"MLK3 drives invasion through upregulation of the oncogenic transcription factor FRA-1 and matrix metalloproteinases MMP-1 and MMP-9. MLK3 depletion (siRNA or CRISPR/Cas9) reduces FRA-1, MMP-1, and MMP-9 levels in TNBC cells. MLK3 controls transendothelial migration via tumor cell-derived MMP-1.","method":"RNAi knockdown, CRISPR/Cas9 editing, FRA-1 siRNA rescue, invasion assay, transendothelial migration assay, circulating tumor cell analysis","journal":"Oncogenesis","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent MLK3 depletion approaches (RNAi and CRISPR), multiple functional readouts, in vivo CTC confirmation","pmids":["28604765"],"is_preprint":false},{"year":2017,"finding":"MLK3 promotes GBM cell migration and invasion downstream of EGFR via a DOCK180→RAC1→MLK3→JNK signaling axis. DOCK180 (a RAC1 GEF overexpressed in invasive GBM) activates MLK3-JNK in a RAC1-dependent manner. MLK3 silencing or MLK inhibition blocks EGF-induced JNK activation and cell invasion.","method":"RNAi knockdown of MLK3 and DOCK180, MLK inhibitor, JNK activation assays, migration/invasion assays, RAC1 dependence assessed","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2/3 / Moderate — RNAi and pharmacological inhibition with defined pathway placement, single lab","pmids":["28487380"],"is_preprint":false},{"year":2018,"finding":"WDR62 scaffolds TRAF2 and MLK3 to mediate TNF-α-dependent JNK activation. CRISPR/Cas9 and shRNA-mediated WDR62 loss of function reduces TNF-α-induced JNK activation and increases resistance to TNF-α-induced cell death.","method":"CRISPR/Cas9 knockout, shRNA knockdown, co-immunoprecipitation (TRAF2-WDR62-MLK3 interaction), JNK activation assay","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR KO with co-IP establishing complex assembly, single lab","pmids":["30091641"],"is_preprint":false},{"year":2005,"finding":"In rat hippocampus during cerebral ischemia, PSD-95 physically links GluR6 (kainate receptor) to MLK3 via its SH3 domain, forming a GluR6•PSD-95•MLK3 signaling module that activates MLK3 autophosphorylation and subsequent JNK3 activation.","method":"Co-immunoprecipitation, immunoblotting, antisense oligodeoxynucleotide knockdown of PSD-95, GluR6 antagonists","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2/3 / Moderate — co-IP identifying tripartite complex with pharmacological and antisense validation, single lab","pmids":["16256962"],"is_preprint":false},{"year":2001,"finding":"MLK-3 is involved in HTLV-1 Tax-mediated NF-κB activation; Tax induces MLK-3 expression, and MLK-3 functionally contributes to Tax-driven NF-κB signaling.","method":"cDNA microarray, functional NF-κB signaling assays","journal":"Oncogene","confidence":"Low","confidence_rationale":"Tier 3 / Weak — microarray-based discovery with partial functional follow-up, single lab","pmids":["11494144"],"is_preprint":false},{"year":2006,"finding":"Akt inhibits the MLK3/JNK3 pathway by phosphorylating Rac1 at Ser71, inactivating Rac1 and thereby preventing MLK3 autophosphorylation. Co-immunoprecipitation revealed that Akt physically interacts with Rac1 in the hippocampal CA1 region.","method":"Co-immunoprecipitation (Akt-Rac1), tyrosine phosphatase inhibition, immunoblotting of MLK3/MKK7/JNK3 phosphorylation","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2/3 / Moderate — co-IP with pharmacological Akt activation and defined phosphorylation site on Rac1, single lab","pmids":["16831194"],"is_preprint":false},{"year":2014,"finding":"MLK3 regulates fMLP-stimulated neutrophil motility: genetic (Mlk3−/− mice) or pharmacological (URMC099 inhibitor) MLK3 inhibition blocks fMLP-induced chemotaxis, random motility, and F-actin formation in vitro, and reduces fMLP-induced peritoneal neutrophil recruitment in vivo.","method":"Mlk3−/− mice, pharmacological inhibitor (URMC099), in vitro chemotaxis, F-actin formation assay, in vivo peritoneal recruitment","journal":"Molecular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO and pharmacological inhibitor with concordant in vitro and in vivo readouts, single lab","pmids":["24389043"],"is_preprint":false}],"current_model":"MLK3 (MAP3K11) is a serine/threonine MAP3K that is activated by Cdc42/Rac1 (via its CRIB motif), ceramide, TNF-α (via direct TRAF2 binding), and oxidative stress; upon activation it homodimerizes via its leucine zipper domain and autophosphorylates, then directly phosphorylates MEKs (SEK1/MKK4, MKK3/6, MKK7) to activate JNK, p38, and—through B-Raf—ERK signaling cascades; MLK3 activity is negatively regulated by AKT-mediated phosphorylation at Ser674; it also functions as a scaffold to limit Rho activation by binding p63RhoGEF, promotes microtubule instability at G2/M from centrosomal locations, and mediates cell migration/invasion in part through JNK-dependent paxillin phosphorylation and FRA-1/MMP upregulation."},"narrative":{"mechanistic_narrative":"MAP3K11 (MLK3) is a mixed-lineage serine/threonine MAP3K that serves as a signal-integrating node funneling stress, cytokine, and small-GTPase inputs into MAPK cascades governing cell migration, proliferation, and survival [PMID:9003778, PMID:8702571, PMID:8195146, PMID:8183572, PMID:8108137]. Its modular architecture—an SH3 domain, a kinase domain with mixed-lineage homology, tandem leucine/isoleucine zippers, a Cdc42/Rac-binding CRIB motif, and a proline-rich C-terminus—supports autophosphorylation on serine and threonine that requires an intact ATP-binding site [PMID:8195146, PMID:8183572, PMID:8108137]. Activation is GTPase-coupled: Cdc42 engages the CRIB motif to alter MLK3 phosphorylation and drive leucine-zipper-mediated disulfide-bridged homodimerization, and this oligomerization is specifically required for productive phosphorylation of the activating Thr258 of MKK4 and downstream JNK activation [PMID:9829970, PMID:10799501, PMID:10862766]. Once active, MLK3 directly phosphorylates and activates SEK1/MKK4 and MKK3/6 to selectively turn on the SAPK/JNK and p38 pathways [PMID:9003778, PMID:8702571], and is additionally required for B-Raf phosphorylation at Thr598/Ser601 to drive ERK signaling and serum-stimulated proliferation [PMID:15258589, PMID:15467451]. MLK3 is activated by ceramide and by TNF-α through direct binding to TRAF2, with genetic ablation revealing a selective requirement for the TNF→JNK axis [PMID:12504027, PMID:15831472, PMID:19918265]. Its kinase activity is restrained by AKT-mediated phosphorylation at Ser674, a brake exploited by estrogen-/HER2-driven signaling in breast cancer to suppress pro-apoptotic MLK3-JNK output [PMID:20145118, PMID:26152725]. Beyond catalysis, MLK3 acts as a kinase-independent scaffold that binds p63RhoGEF to limit Rho activation and, together with JNK-dependent paxillin phosphorylation and FRA-1/MMP-1/MMP-9 upregulation, drives focal-adhesion turnover, invasion, and metastasis [PMID:18851832, PMID:22700880, PMID:28604765]. MLK3 also localizes near centrosomes and promotes microtubule instability at mitotic entry [PMID:12529434], and in vivo it controls CDC42-dependent osteoblast differentiation and skeletal mineralization, with Mlk3−/− mice modeling Aarskog-syndrome-like skeletal defects [PMID:21965325].","teleology":[{"year":1994,"claim":"Established MLK3 as a multidomain serine/threonine kinase, defining the structural toolkit (SH3, kinase, leucine zippers, CRIB, proline-rich region) through which it would later integrate signals.","evidence":"cDNA cloning, domain analysis, and ATP-site mutagenesis confirming autophosphorylation","pmids":["8195146","8183572","8108137"],"confidence":"High","gaps":["Did not identify physiological substrates or upstream activators","No structural model of domain interactions"]},{"year":1996,"claim":"Placed MLK3 in the MAPK hierarchy by showing it directly activates MKK4 and MKK3/6 to selectively engage JNK and p38 but not ERK, defining its core catalytic output.","evidence":"In vitro kinase assays and co-precipitation with SEK1/MKK6 in transfected cells","pmids":["9003778","8702571"],"confidence":"High","gaps":["Did not address how MLK3 itself is activated","ERK linkage via B-Raf not yet known"]},{"year":2000,"claim":"Resolved the activation mechanism: Cdc42 binds the CRIB motif and drives leucine-zipper dimerization that is specifically required for MKK4 Thr258 phosphorylation and JNK activation, separating autophosphorylation from substrate targeting.","evidence":"CRIB and zipper (L410P) mutagenesis, phosphopeptide mapping, and in vitro/JNK activation assays","pmids":["10799501","10862766","9829970"],"confidence":"High","gaps":["Cdc42 activation could not be reconstituted in vitro, implying unidentified cellular cofactors","Identity of the disulfide-bridge partner residues incompletely defined"]},{"year":2002,"claim":"Identified physiological agonists (ceramide, TNF-α) and mapped multiple in vivo phosphorylation sites, including Cdc42-induced Ser555/Ser556, linking upstream stimuli to defined regulatory modifications.","evidence":"In vivo/in vitro kinase assays with ceramide and sphingomyelinase; mass spectrometry and 2D phosphopeptide mapping","pmids":["12504027","11969422"],"confidence":"High","gaps":["Functional roles of most mapped phosphosites unresolved","Direct ceramide-binding site not defined"]},{"year":2004,"claim":"Extended MLK3's reach to the ERK pathway by showing it is required for B-Raf activation and proliferation, positioning it upstream of B-Raf rather than as a JNK/p38-only kinase.","evidence":"RNAi silencing, phospho-B-Raf immunoblotting, and epistasis with B-Raf/Raf-1 mutant tumor lines","pmids":["15258589","15467451"],"confidence":"High","gaps":["Whether MLK3 phosphorylates B-Raf directly not established","Mechanism coupling MLK3 to three distinct MAPK outputs unclear"]},{"year":2005,"claim":"Genetic ablation in mice demonstrated that MLK3's non-redundant in vivo role is selective amplification of TNF-stimulated JNK signaling.","evidence":"Mlk3−/− mouse embryonic fibroblasts with MAPK phosphorylation readouts","pmids":["15831472"],"confidence":"High","gaps":["Redundancy with other MLK family members not directly tested","Tissue-specific roles not addressed"]},{"year":2009,"claim":"Defined the receptor-proximal mechanism for TNF→JNK signaling by establishing direct TRAF2–MLK3 binding via the MLK3 C-terminus as the activation step.","evidence":"Reciprocal co-IP, domain mapping, and dominant-negative TRAF2 competition","pmids":["19918265"],"confidence":"High","gaps":["Did not resolve how TRAF2 binding triggers kinase activation","Scaffold organization of the complex unknown until WDR62 work"]},{"year":2008,"claim":"Revealed a kinase-independent scaffolding function: MLK3 sequesters p63RhoGEF to limit Rho activation, expanding its role from catalysis to cytoskeletal/migration control.","evidence":"Co-IP, kinase-dead rescue, Rho activity and migration assays","pmids":["18851832"],"confidence":"High","gaps":["Structural basis of p63RhoGEF binding undefined","Balance between kinase and scaffold modes in vivo unclear"]},{"year":2010,"claim":"Identified AKT-mediated Ser674 phosphorylation as a kinase-inhibitory brake co-opted by estrogen/PI3K signaling to suppress MLK3-JNK pro-apoptotic output in breast cancer.","evidence":"Phosphosite analysis, AKT knockdown, and kinase activity assays in ER+ cells","pmids":["20145118"],"confidence":"Medium","gaps":["Single-lab phosphosite mapping","Structural effect of Ser674 phosphorylation on the kinase domain unknown"]},{"year":2011,"claim":"Genetic epistasis established a developmental FGD1/CDC42→MLK3→ERK/p38→Runx2 axis essential for skeletal mineralization, with Mlk3 mutants phenocopying Aarskog syndrome.","evidence":"Mlk3−/− and CDC42-resistant knockin mice with phospho-MAPK and skeletal phenotyping","pmids":["21965325"],"confidence":"High","gaps":["Direct MLK3 substrate driving Runx2 phosphorylation not pinpointed","Human genetic confirmation in Aarskog patients not addressed here"]},{"year":2012,"claim":"Connected MLK3 to invasion machinery by showing JNK-dependent paxillin Ser178 phosphorylation drives focal-adhesion turnover and breast cancer metastasis.","evidence":"RNAi, paxillin S178A mutant, Rho activity assay, and in vivo lung metastasis model","pmids":["22700880"],"confidence":"High","gaps":["Relative contribution of scaffold vs kinase activity to metastasis not separated","Tyr118 phosphorylation mechanism not defined"]},{"year":2017,"claim":"Defined the transcriptional/proteolytic effectors of MLK3-driven invasion as FRA-1 and MMP-1/MMP-9, and described ROS- and ERK-driven positive feedback loops sustaining invasive signaling.","evidence":"RNAi/CRISPR depletion, FRA-1 rescue, invasion/transendothelial assays; in vitro ERK1 phosphorylation of kinase-dead MLK3 at Ser705/Ser758 with S705A/S758A mutants","pmids":["28604765","29084209","24894995"],"confidence":"High","gaps":["Whether ERK-MLK3 feedback operates in non-cancer contexts unknown","ROS sensing mechanism upstream of MLK3 not molecularly defined"]},{"year":2018,"claim":"Identified additional scaffolds and effectors—WDR62 organizing TRAF2-MLK3 for TNF→JNK, and a ULK1-MLK3-ERK5 axis for antiviral gene induction—broadening MLK3's signaling repertoire.","evidence":"CRISPR/shRNA WDR62 loss-of-function with co-IP; ULK1-MLK3 co-IP with ERK5 and ISG readouts","pmids":["30091641","30459284"],"confidence":"Medium","gaps":["Single-lab observations","Direct ULK1 phosphorylation of MLK3 not biochemically confirmed"]},{"year":null,"claim":"How MLK3 dynamically partitions among its JNK, p38, ERK/B-Raf, ERK5, and scaffold-only functions, and what governs substrate selection (e.g. direct AMPKα1 Thr172 phosphorylation) in a given cellular context, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model explaining context-dependent output switching","Direct vs indirect substrate relationships (AMPK, B-Raf, Runx2) not fully reconstituted","Quantitative rules coupling input strength to JNK vs ERK choice undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,4,8,18,21]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,1,8]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[1]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[10,24]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[7]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,8,11,23]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9,15,19,28]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[13]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[14,20,22]}],"complexes":["TRAF2–WDR62–MLK3 complex","GluR6–PSD-95–MLK3 complex"],"partners":["MAP2K4","MAP2K6","TRAF2","BRAF","ARHGEF25","WDR62","ULK1","CDC42"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q16584","full_name":"Mitogen-activated protein kinase kinase kinase 11","aliases":["Mixed lineage kinase 3","Src-homology 3 domain-containing proline-rich kinase"],"length_aa":847,"mass_kda":92.7,"function":"Activates the JUN N-terminal pathway. Required for serum-stimulated cell proliferation and for mitogen and cytokine activation of MAPK14 (p38), MAPK3 (ERK) and MAPK8 (JNK1) through phosphorylation and activation of MAP2K4/MKK4 and MAP2K7/MKK7. Plays a role in mitogen-stimulated phosphorylation and activation of BRAF, but does not phosphorylate BRAF directly. 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dephosphorylation of keratin polypeptides.","date":"1988","source":"Cell motility and the cytoskeleton","url":"https://pubmed.ncbi.nlm.nih.gov/2463103","citation_count":25,"is_preprint":false},{"pmid":"30459284","id":"PMC_30459284","title":"IFN-γ-inducible antiviral responses require ULK1-mediated activation of MLK3 and ERK5.","date":"2018","source":"Science signaling","url":"https://pubmed.ncbi.nlm.nih.gov/30459284","citation_count":24,"is_preprint":false},{"pmid":"15308300","id":"PMC_15308300","title":"Postsynaptic density protein 95 antisense oligodeoxynucleotides inhibits the activation of MLK3 and JNK3 via the GluR6.PSD-95.MLK3 signaling module after transient cerebral ischemia in rat hippocampus.","date":"2004","source":"Neuroscience letters","url":"https://pubmed.ncbi.nlm.nih.gov/15308300","citation_count":24,"is_preprint":false},{"pmid":"26717044","id":"PMC_26717044","title":"Overexpression of miR-199a-5p decreases esophageal cancer cell proliferation through repression of mitogen-activated protein kinase kinase kinase-11 (MAP3K11).","date":"2016","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/26717044","citation_count":23,"is_preprint":false},{"pmid":"26138442","id":"PMC_26138442","title":"MAP3K11 is a tumor suppressor targeted by the oncomiR miR-125b in early B cells.","date":"2015","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/26138442","citation_count":22,"is_preprint":false},{"pmid":"8608604","id":"PMC_8608604","title":"Cytochalasin J affects chromosome congression and spindle microtubule organization in PtK1 cells.","date":"1995","source":"Cell motility and the cytoskeleton","url":"https://pubmed.ncbi.nlm.nih.gov/8608604","citation_count":22,"is_preprint":false},{"pmid":"6204764","id":"PMC_6204764","title":"Dynamics of keratin filaments and the intermediate filament distribution center during shape change in PtK1 cells.","date":"1984","source":"Cell 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Factor Receptor 2 (HER2) Impedes MLK3 Kinase Activity to Support Breast Cancer Cell Survival.","date":"2015","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/26152725","citation_count":19,"is_preprint":false},{"pmid":"27526795","id":"PMC_27526795","title":"Heme Oxygenase-1 Inhibits Neuronal Apoptosis in Spinal Cord Injury through Down-Regulation of Cdc42-MLK3-MKK7-JNK3 Axis.","date":"2016","source":"Journal of neurotrauma","url":"https://pubmed.ncbi.nlm.nih.gov/27526795","citation_count":19,"is_preprint":false},{"pmid":"11713255","id":"PMC_11713255","title":"Role of MLK3-mediated activation of p70 S6 kinase in Rac1 transformation.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11713255","citation_count":19,"is_preprint":false},{"pmid":"18172894","id":"PMC_18172894","title":"Neuroprotection of hypothermia against neuronal death in rat hippocampus through inhibiting the increased assembly of GluR6-PSD95-MLK3 signaling module induced by cerebral ischemia/reperfusion.","date":"2008","source":"Hippocampus","url":"https://pubmed.ncbi.nlm.nih.gov/18172894","citation_count":19,"is_preprint":false},{"pmid":"2440591","id":"PMC_2440591","title":"Cytochalasin B-induced redistribution of cytokeratin filaments in PtK1 cells.","date":"1987","source":"Cell motility and the cytoskeleton","url":"https://pubmed.ncbi.nlm.nih.gov/2440591","citation_count":19,"is_preprint":false},{"pmid":"30412737","id":"PMC_30412737","title":"The potential role of HO-1 in regulating the MLK3-MKK7-JNK3 module scaffolded by JIP1 during cerebral ischemia/reperfusion in rats.","date":"2018","source":"Behavioural brain research","url":"https://pubmed.ncbi.nlm.nih.gov/30412737","citation_count":18,"is_preprint":false},{"pmid":"3068060","id":"PMC_3068060","title":"Calmodulin colocalization with cold-stable and nocodazole-stable microtubules in living PtK1 cells.","date":"1988","source":"European journal of cell 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Modulates Apoptosis in NRK-52E Cells and Activates Fas/FasL Through the MLK3-MKK7-JNK3 Signaling Pathway.","date":"2016","source":"Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/27606894","citation_count":17,"is_preprint":false},{"pmid":"3817015","id":"PMC_3817015","title":"RNA polymerase activity in PtK1 micronuclei containing individual chromosomes. 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Co-precipitation experiments demonstrated physical interactions between MLK3 and SEK1, and between MLK3 and MKK6.\",\n      \"method\": \"In vitro kinase assay (immunoprecipitated MLK3 phosphorylating SEK1), co-transfection, co-precipitation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Strong — in vitro kinase assay combined with co-precipitation and transfection, replicated across two independent labs (PMID:9003778 and PMID:8702571)\",\n      \"pmids\": [\"9003778\", \"8702571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"MLK3/SPRK/PTK1 is a serine/threonine kinase with an N-terminal SH3 domain, a kinase catalytic domain with mixed-lineage homology, tandem leucine/isoleucine zippers, a Cdc42/Rac-binding (CRIB) motif, and a proline-rich C-terminal region. Epitope-tagged SPRK autophosphorylates on serine and threonine; point mutations in the ATP-binding site abolish phosphorylation.\",\n      \"method\": \"cDNA cloning, domain analysis, in vitro kinase assay, site-directed mutagenesis of ATP-binding site\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted kinase activity with active-site mutagenesis; independently cloned in two labs (PMID:8195146, PMID:8183572, PMID:8108137)\",\n      \"pmids\": [\"8195146\", \"8183572\", \"8108137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"MLK3 forms disulfide-bridged homodimers through its tandem leucine zipper (LZ) motif; dimerization is required for MLK3 autophosphorylation and subsequent SAPK/JNK activation. Co-expression of activated Cdc42 substantially increases MLK3 dimerization. An LZ-deletion mutant fails to activate SAPK.\",\n      \"method\": \"Co-immunoprecipitation, non-reducing SDS-PAGE, co-expression with Cdc42, dominant-negative LZ polypeptide expression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and non-reducing PAGE with multiple genetic constructs in single lab\",\n      \"pmids\": [\"9829970\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Cdc42 activates MLK3/SPRK via its functional CRIB motif, altering MLK3 in vivo serine/threonine phosphorylation pattern. Unlike PAK, Cdc42-mediated activation of SPRK cannot be recapitulated in vitro with purified proteins, suggesting additional cellular components are required.\",\n      \"method\": \"Site-directed mutagenesis of CRIB motif, co-expression with activated Cdc42, comparative phosphopeptide mapping, in vitro kinase assay (negative result for recapitulation)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Moderate — mutagenesis, phosphopeptide mapping, and in vitro assay in single lab\",\n      \"pmids\": [\"10799501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Zipper-mediated MLK3/SPRK oligomerization is not required for Cdc42-induced autophosphorylation or histone kinase activity, but is essential for activation of JNK via MKK4. A monomeric SPRK zipper mutant (L410P) fails to phosphorylate the activating Thr258 residue of MKK4, showing that oligomerization is required for proper interaction with the downstream substrate MKK4.\",\n      \"method\": \"Site-directed mutagenesis of leucine zipper (L410P), in vitro kinase assay, JNK activation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mutagenesis and defined substrate phosphorylation site, single lab\",\n      \"pmids\": [\"10862766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Ceramide and TNF-α are agonists of MLK3: a ceramide analog and bacterial sphingomyelinase activate MLK3 in vivo, and natural ceramide activates MLK3 in vitro at low nanomolar concentrations. Specific inhibition of MLK3 attenuates ceramide-induced JNK activation without affecting p38 or ERK.\",\n      \"method\": \"In vivo kinase assays, in vitro kinase assay with natural ceramide, pharmacological inhibition\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Moderate — in vitro and in vivo kinase assays with multiple orthogonal approaches in single study\",\n      \"pmids\": [\"12504027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"MLK3 in vivo phosphorylation sites identified by mass spectrometry and phosphopeptide mapping include Ser524, Ser555, Ser556, Ser654, Ser705, Ser724, Ser727, Ser740, Ser758, Ser770, Ser793, and a site in Ser11-Arg37. Activated Cdc42 specifically induces phosphorylation of Ser555 and Ser556.\",\n      \"method\": \"Mass spectrometry, C18 reverse-phase HPLC, porous graphitic carbon chromatography, MALDI-MS, 2D phosphopeptide mapping, alkaline phosphatase treatment\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mass spectrometry with multiple complementary chromatographic methods and confirmatory 2D mapping\",\n      \"pmids\": [\"11969422\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Endogenous MLK3 localizes near centrosomes during interphase, disperses away transiently at G2/M, and has enhanced phosphorylation and activity during G2/M when JNK remains inactive. Overexpressed MLK3 disrupts cytoplasmic microtubules (like NIMA). MLK3 siRNA depletion increases sensitivity to taxol, indicating a role in promoting microtubule instability at M-phase entry.\",\n      \"method\": \"Immunofluorescence localization of endogenous MLK3, cell-cycle synchronization, kinase activity assays, siRNA knockdown, taxol sensitivity assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 / Moderate — localization with functional consequence (taxol sensitivity), multiple methods in single lab\",\n      \"pmids\": [\"12529434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MLK3 is required for mitogen- and cytokine-stimulated phosphorylation of B-Raf at Thr598/Ser601, a step required for B-Raf activation and downstream ERK signaling. RNAi silencing of MLK3 suppresses JNK, ERK, and p38 activation and blocks serum-stimulated cell proliferation. Tumor cells with activating B-Raf or Raf-1 mutations are unaffected by MLK3 silencing, placing MLK3 upstream of B-Raf.\",\n      \"method\": \"RNAi knockdown, phospho-specific immunoblotting, proliferation assays, genetic epistasis with B-Raf/Raf-1 mutant cell lines\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNAi with defined phosphorylation readout, epistasis with multiple cell lines, replicated in companion paper PMID:15467451\",\n      \"pmids\": [\"15258589\", \"15467451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MLK3 deficiency in mice causes a selective reduction in TNF-stimulated JNK activation but no major defects in other MAPK signaling (ERK, p38), establishing that MLK3 contributes specifically to the TNF→JNK pathway in primary embryonic fibroblasts.\",\n      \"method\": \"Targeted gene disruption (Mlk3−/− mice), primary embryonic fibroblast stimulation, immunoblotting of MAPK phosphorylation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean genetic KO with specific signaling readout, multiple MAPK pathways tested\",\n      \"pmids\": [\"15831472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"MLK3 binds directly to the Rho activator p63RhoGEF/GEFT, preventing its activation by Gαq and thereby limiting Rho activation. This scaffolding function is independent of MLK3 kinase activity and is required for cell migration.\",\n      \"method\": \"Co-immunoprecipitation, kinase-dead MLK3 rescue experiments, Rho activity assays, cell migration assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with kinase-dead mutant establishing scaffold function, multiple orthogonal assays\",\n      \"pmids\": [\"18851832\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TRAF2 directly interacts with MLK3 and is required for TNF-α-induced MLK3 activation. The TRAF domain of TRAF2 mediates the interaction, and the C-terminal half (aa 511–847) of MLK3 is the TRAF2-binding region. Endogenous TRAF2 and MLK3 associate in a TNF-α time-dependent manner; competition with a TRAF2 deletion mutant attenuates MLK3 kinase activity and downstream JNK activation.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, kinase activity assays, dominant-negative TRAF2 competition\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP with domain mapping and functional kinase activity readout, single lab\",\n      \"pmids\": [\"19918265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"AKT1/2 phosphorylates MLK3 at Ser674, which inhibits MLK3 kinase activity in ER+ breast cancer cells. Estrogen (E2) activates AKT via ERα-PI3K interaction, leading to MLK3 Ser674 phosphorylation and suppression of MLK3-JNK pro-apoptotic signaling.\",\n      \"method\": \"Site-directed phosphorylation site analysis, AKT knockdown, kinase activity assays, immunoblotting\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific phosphorylation site identified with knockdown rescue, single lab\",\n      \"pmids\": [\"20145118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MLK3 functions downstream of FGD1/CDC42 in osteoblasts to regulate ERK and p38 MAPK, which phosphorylate Runx2 to control osteoblast differentiation. Mlk3−/− mice display skeletal defects mirroring Aarskog syndrome; a CDC42-resistant MLK3 knockin allele produces the same defects, demonstrating that CDC42 activation of MLK3 is specifically required for skeletal mineralization.\",\n      \"method\": \"Targeted gene disruption (Mlk3−/−), knockin of CDC42-resistant Mlk3 allele, phospho-MAPK immunoblotting, skeletal phenotype analysis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO and knockin genetic epistasis, multiple orthogonal methods, consistent phenotype\",\n      \"pmids\": [\"21965325\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MLK3 promotes phosphorylation of the focal adhesion scaffold paxillin at Ser178 (via JNK) and Tyr118, limiting Rho activity to promote focal adhesion turnover and cell migration. MLK3 silencing increases focal adhesions and stress fibers, and reduces breast cancer lung metastasis in vivo.\",\n      \"method\": \"RNAi knockdown, pharmacological inhibition, paxillin S178A mutant expression, Rho activity assay, in vivo metastasis model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RNAi + mutant rescue + in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"22700880\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MLK3 promotes saturated fatty acid-induced JNK activation in macrophages in vitro and in vivo. MLK3-deficient mice on high-fat diet show decreased adiposity, attenuated JNK activation, reduced macrophage infiltration, and improved insulin resistance, demonstrating MLK3's role in diet-induced metabolic dysfunction.\",\n      \"method\": \"MLK3 knockout mice, high-fat diet model, JNK activation assays, macrophage polarization, in vitro palmitate stimulation\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with in vivo and in vitro orthogonal assays, single lab\",\n      \"pmids\": [\"23860122\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"GSK-3β inactivation disrupts MLK3 dimerization-induced autophosphorylation in microglia, blocking the MLK3→MKK4→JNK signaling cascade and reducing LPS-induced TNF-α production. Co-immunoprecipitation demonstrated a functional interaction between MLK3 and GSK-3β.\",\n      \"method\": \"Co-immunoprecipitation, GSK-3β inhibitors and siRNA, ELISA, western blotting, NF-κB reporter assay\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single co-IP with pharmacological and genetic inhibition, multiple readouts\",\n      \"pmids\": [\"21194439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MLK3 is part of a positive feedback loop with ERK and JNK: low ROS preferentially activates ERK while high ROS activates JNK via MLK3. MLK3 knockdown or inhibition shifts ROS-induced responses toward ERK activation and reduces cell death, establishing MLK3 as a critical switch between proliferative and apoptotic ROS responses.\",\n      \"method\": \"Mathematical modeling, MLK3 knockdown, MLK3 inhibitor, phospho-ERK/JNK immunoblotting, cell viability assays\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 / Moderate — RNAi knockdown with mathematical modeling and pharmacological validation, single lab\",\n      \"pmids\": [\"24894995\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MLK3 phosphorylation by ERK1/2 at Ser705 and Ser758 promotes MLK3-dependent B-Raf and ERK1/2 activation, creating a positive feedback loop that enhances oxidative stress-induced colorectal cancer cell invasion. Active ERK1 phosphorylates kinase-dead MLK3 in vitro; the S705A/S758A mutant shows reduced ERK1/2 activation and decreased interaction with B-Raf.\",\n      \"method\": \"In vitro kinase assay (ERK1 phosphorylating kinase-dead MLK3), co-immunoprecipitation, site-directed mutagenesis (S705A/S758A), invasion assay, siRNA knockdown\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1/2 / Moderate — in vitro kinase assay with mutagenesis, co-IP, and functional invasion readout, single lab\",\n      \"pmids\": [\"29084209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"IFN-γ receptor stimulation activates ULK1, which interacts with MLK3 and is required for MLK3 phosphorylation and downstream ERK5 activation. This ULK1-MLK3-ERK5 axis promotes transcription of antiviral IFN-stimulated genes independently of ULK1's autophagy function.\",\n      \"method\": \"Co-immunoprecipitation (ULK1-MLK3 interaction), phosphorylation assays, ERK5 activation assays, IFN-stimulated gene expression\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 / Moderate — co-IP with functional signaling and transcriptional readouts, single lab\",\n      \"pmids\": [\"30459284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"HER2 suppresses MLK3 kinase activity in HER2+ breast cancer via AKT-mediated phosphorylation of MLK3 at Ser674. HER2 depletion or treatment with trastuzumab/lapatinib stimulates MLK3 activity; PI3K/AKT inhibitors block this effect. MLK3 knockdown blunts pro-apoptotic effects of HER2-targeted therapies.\",\n      \"method\": \"Kinase activity assays in HER2+ tumor tissues and cell lines, HER2/HER3 siRNA, trastuzumab/lapatinib treatment, PI3K/AKT inhibition, MLK3 stable knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined phosphorylation site (Ser674) with multiple pharmacological and genetic interventions, single lab\",\n      \"pmids\": [\"26152725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MLK3 directly phosphorylates AMPKα1 at Thr172 independently of LKB1. GST pull-down assays demonstrate direct interaction between AMPKα1 and MLK3. MLK3-mediated AMPK phosphorylation is AMP-independent.\",\n      \"method\": \"In vitro kinase assay, GST pull-down, LKB1-deficient cell lines, AMPK phosphorylation at T172\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1/3 / Moderate — in vitro kinase assay and GST pull-down, single lab\",\n      \"pmids\": [\"25874865\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MLK3 drives invasion through upregulation of the oncogenic transcription factor FRA-1 and matrix metalloproteinases MMP-1 and MMP-9. MLK3 depletion (siRNA or CRISPR/Cas9) reduces FRA-1, MMP-1, and MMP-9 levels in TNBC cells. MLK3 controls transendothelial migration via tumor cell-derived MMP-1.\",\n      \"method\": \"RNAi knockdown, CRISPR/Cas9 editing, FRA-1 siRNA rescue, invasion assay, transendothelial migration assay, circulating tumor cell analysis\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent MLK3 depletion approaches (RNAi and CRISPR), multiple functional readouts, in vivo CTC confirmation\",\n      \"pmids\": [\"28604765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MLK3 promotes GBM cell migration and invasion downstream of EGFR via a DOCK180→RAC1→MLK3→JNK signaling axis. DOCK180 (a RAC1 GEF overexpressed in invasive GBM) activates MLK3-JNK in a RAC1-dependent manner. MLK3 silencing or MLK inhibition blocks EGF-induced JNK activation and cell invasion.\",\n      \"method\": \"RNAi knockdown of MLK3 and DOCK180, MLK inhibitor, JNK activation assays, migration/invasion assays, RAC1 dependence assessed\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 / Moderate — RNAi and pharmacological inhibition with defined pathway placement, single lab\",\n      \"pmids\": [\"28487380\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"WDR62 scaffolds TRAF2 and MLK3 to mediate TNF-α-dependent JNK activation. CRISPR/Cas9 and shRNA-mediated WDR62 loss of function reduces TNF-α-induced JNK activation and increases resistance to TNF-α-induced cell death.\",\n      \"method\": \"CRISPR/Cas9 knockout, shRNA knockdown, co-immunoprecipitation (TRAF2-WDR62-MLK3 interaction), JNK activation assay\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR KO with co-IP establishing complex assembly, single lab\",\n      \"pmids\": [\"30091641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"In rat hippocampus during cerebral ischemia, PSD-95 physically links GluR6 (kainate receptor) to MLK3 via its SH3 domain, forming a GluR6•PSD-95•MLK3 signaling module that activates MLK3 autophosphorylation and subsequent JNK3 activation.\",\n      \"method\": \"Co-immunoprecipitation, immunoblotting, antisense oligodeoxynucleotide knockdown of PSD-95, GluR6 antagonists\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 / Moderate — co-IP identifying tripartite complex with pharmacological and antisense validation, single lab\",\n      \"pmids\": [\"16256962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"MLK-3 is involved in HTLV-1 Tax-mediated NF-κB activation; Tax induces MLK-3 expression, and MLK-3 functionally contributes to Tax-driven NF-κB signaling.\",\n      \"method\": \"cDNA microarray, functional NF-κB signaling assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — microarray-based discovery with partial functional follow-up, single lab\",\n      \"pmids\": [\"11494144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Akt inhibits the MLK3/JNK3 pathway by phosphorylating Rac1 at Ser71, inactivating Rac1 and thereby preventing MLK3 autophosphorylation. Co-immunoprecipitation revealed that Akt physically interacts with Rac1 in the hippocampal CA1 region.\",\n      \"method\": \"Co-immunoprecipitation (Akt-Rac1), tyrosine phosphatase inhibition, immunoblotting of MLK3/MKK7/JNK3 phosphorylation\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2/3 / Moderate — co-IP with pharmacological Akt activation and defined phosphorylation site on Rac1, single lab\",\n      \"pmids\": [\"16831194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MLK3 regulates fMLP-stimulated neutrophil motility: genetic (Mlk3−/− mice) or pharmacological (URMC099 inhibitor) MLK3 inhibition blocks fMLP-induced chemotaxis, random motility, and F-actin formation in vitro, and reduces fMLP-induced peritoneal neutrophil recruitment in vivo.\",\n      \"method\": \"Mlk3−/− mice, pharmacological inhibitor (URMC099), in vitro chemotaxis, F-actin formation assay, in vivo peritoneal recruitment\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO and pharmacological inhibitor with concordant in vitro and in vivo readouts, single lab\",\n      \"pmids\": [\"24389043\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MLK3 (MAP3K11) is a serine/threonine MAP3K that is activated by Cdc42/Rac1 (via its CRIB motif), ceramide, TNF-α (via direct TRAF2 binding), and oxidative stress; upon activation it homodimerizes via its leucine zipper domain and autophosphorylates, then directly phosphorylates MEKs (SEK1/MKK4, MKK3/6, MKK7) to activate JNK, p38, and—through B-Raf—ERK signaling cascades; MLK3 activity is negatively regulated by AKT-mediated phosphorylation at Ser674; it also functions as a scaffold to limit Rho activation by binding p63RhoGEF, promotes microtubule instability at G2/M from centrosomal locations, and mediates cell migration/invasion in part through JNK-dependent paxillin phosphorylation and FRA-1/MMP upregulation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MAP3K11 (MLK3) is a mixed-lineage serine/threonine MAP3K that serves as a signal-integrating node funneling stress, cytokine, and small-GTPase inputs into MAPK cascades governing cell migration, proliferation, and survival [#0, #1]. Its modular architecture—an SH3 domain, a kinase domain with mixed-lineage homology, tandem leucine/isoleucine zippers, a Cdc42/Rac-binding CRIB motif, and a proline-rich C-terminus—supports autophosphorylation on serine and threonine that requires an intact ATP-binding site [#1]. Activation is GTPase-coupled: Cdc42 engages the CRIB motif to alter MLK3 phosphorylation and drive leucine-zipper-mediated disulfide-bridged homodimerization, and this oligomerization is specifically required for productive phosphorylation of the activating Thr258 of MKK4 and downstream JNK activation [#2, #3, #4]. Once active, MLK3 directly phosphorylates and activates SEK1/MKK4 and MKK3/6 to selectively turn on the SAPK/JNK and p38 pathways [#0], and is additionally required for B-Raf phosphorylation at Thr598/Ser601 to drive ERK signaling and serum-stimulated proliferation [#8]. MLK3 is activated by ceramide and by TNF-\\u03b1 through direct binding to TRAF2, with genetic ablation revealing a selective requirement for the TNF\\u2192JNK axis [#5, #9, #11]. Its kinase activity is restrained by AKT-mediated phosphorylation at Ser674, a brake exploited by estrogen-/HER2-driven signaling in breast cancer to suppress pro-apoptotic MLK3-JNK output [#12, #20]. Beyond catalysis, MLK3 acts as a kinase-independent scaffold that binds p63RhoGEF to limit Rho activation and, together with JNK-dependent paxillin phosphorylation and FRA-1/MMP-1/MMP-9 upregulation, drives focal-adhesion turnover, invasion, and metastasis [#10, #14, #22]. MLK3 also localizes near centrosomes and promotes microtubule instability at mitotic entry [#7], and in vivo it controls CDC42-dependent osteoblast differentiation and skeletal mineralization, with Mlk3\\u2212/\\u2212 mice modeling Aarskog-syndrome-like skeletal defects [#13].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established MLK3 as a multidomain serine/threonine kinase, defining the structural toolkit (SH3, kinase, leucine zippers, CRIB, proline-rich region) through which it would later integrate signals.\",\n      \"evidence\": \"cDNA cloning, domain analysis, and ATP-site mutagenesis confirming autophosphorylation\",\n      \"pmids\": [\"8195146\", \"8183572\", \"8108137\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify physiological substrates or upstream activators\", \"No structural model of domain interactions\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Placed MLK3 in the MAPK hierarchy by showing it directly activates MKK4 and MKK3/6 to selectively engage JNK and p38 but not ERK, defining its core catalytic output.\",\n      \"evidence\": \"In vitro kinase assays and co-precipitation with SEK1/MKK6 in transfected cells\",\n      \"pmids\": [\"9003778\", \"8702571\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address how MLK3 itself is activated\", \"ERK linkage via B-Raf not yet known\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Resolved the activation mechanism: Cdc42 binds the CRIB motif and drives leucine-zipper dimerization that is specifically required for MKK4 Thr258 phosphorylation and JNK activation, separating autophosphorylation from substrate targeting.\",\n      \"evidence\": \"CRIB and zipper (L410P) mutagenesis, phosphopeptide mapping, and in vitro/JNK activation assays\",\n      \"pmids\": [\"10799501\", \"10862766\", \"9829970\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cdc42 activation could not be reconstituted in vitro, implying unidentified cellular cofactors\", \"Identity of the disulfide-bridge partner residues incompletely defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified physiological agonists (ceramide, TNF-\\u03b1) and mapped multiple in vivo phosphorylation sites, including Cdc42-induced Ser555/Ser556, linking upstream stimuli to defined regulatory modifications.\",\n      \"evidence\": \"In vivo/in vitro kinase assays with ceramide and sphingomyelinase; mass spectrometry and 2D phosphopeptide mapping\",\n      \"pmids\": [\"12504027\", \"11969422\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional roles of most mapped phosphosites unresolved\", \"Direct ceramide-binding site not defined\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Extended MLK3's reach to the ERK pathway by showing it is required for B-Raf activation and proliferation, positioning it upstream of B-Raf rather than as a JNK/p38-only kinase.\",\n      \"evidence\": \"RNAi silencing, phospho-B-Raf immunoblotting, and epistasis with B-Raf/Raf-1 mutant tumor lines\",\n      \"pmids\": [\"15258589\", \"15467451\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MLK3 phosphorylates B-Raf directly not established\", \"Mechanism coupling MLK3 to three distinct MAPK outputs unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Genetic ablation in mice demonstrated that MLK3's non-redundant in vivo role is selective amplification of TNF-stimulated JNK signaling.\",\n      \"evidence\": \"Mlk3\\u2212/\\u2212 mouse embryonic fibroblasts with MAPK phosphorylation readouts\",\n      \"pmids\": [\"15831472\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Redundancy with other MLK family members not directly tested\", \"Tissue-specific roles not addressed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined the receptor-proximal mechanism for TNF\\u2192JNK signaling by establishing direct TRAF2\\u2013MLK3 binding via the MLK3 C-terminus as the activation step.\",\n      \"evidence\": \"Reciprocal co-IP, domain mapping, and dominant-negative TRAF2 competition\",\n      \"pmids\": [\"19918265\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how TRAF2 binding triggers kinase activation\", \"Scaffold organization of the complex unknown until WDR62 work\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed a kinase-independent scaffolding function: MLK3 sequesters p63RhoGEF to limit Rho activation, expanding its role from catalysis to cytoskeletal/migration control.\",\n      \"evidence\": \"Co-IP, kinase-dead rescue, Rho activity and migration assays\",\n      \"pmids\": [\"18851832\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of p63RhoGEF binding undefined\", \"Balance between kinase and scaffold modes in vivo unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified AKT-mediated Ser674 phosphorylation as a kinase-inhibitory brake co-opted by estrogen/PI3K signaling to suppress MLK3-JNK pro-apoptotic output in breast cancer.\",\n      \"evidence\": \"Phosphosite analysis, AKT knockdown, and kinase activity assays in ER+ cells\",\n      \"pmids\": [\"20145118\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab phosphosite mapping\", \"Structural effect of Ser674 phosphorylation on the kinase domain unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Genetic epistasis established a developmental FGD1/CDC42\\u2192MLK3\\u2192ERK/p38\\u2192Runx2 axis essential for skeletal mineralization, with Mlk3 mutants phenocopying Aarskog syndrome.\",\n      \"evidence\": \"Mlk3\\u2212/\\u2212 and CDC42-resistant knockin mice with phospho-MAPK and skeletal phenotyping\",\n      \"pmids\": [\"21965325\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct MLK3 substrate driving Runx2 phosphorylation not pinpointed\", \"Human genetic confirmation in Aarskog patients not addressed here\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected MLK3 to invasion machinery by showing JNK-dependent paxillin Ser178 phosphorylation drives focal-adhesion turnover and breast cancer metastasis.\",\n      \"evidence\": \"RNAi, paxillin S178A mutant, Rho activity assay, and in vivo lung metastasis model\",\n      \"pmids\": [\"22700880\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of scaffold vs kinase activity to metastasis not separated\", \"Tyr118 phosphorylation mechanism not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the transcriptional/proteolytic effectors of MLK3-driven invasion as FRA-1 and MMP-1/MMP-9, and described ROS- and ERK-driven positive feedback loops sustaining invasive signaling.\",\n      \"evidence\": \"RNAi/CRISPR depletion, FRA-1 rescue, invasion/transendothelial assays; in vitro ERK1 phosphorylation of kinase-dead MLK3 at Ser705/Ser758 with S705A/S758A mutants\",\n      \"pmids\": [\"28604765\", \"29084209\", \"24894995\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ERK-MLK3 feedback operates in non-cancer contexts unknown\", \"ROS sensing mechanism upstream of MLK3 not molecularly defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified additional scaffolds and effectors—WDR62 organizing TRAF2-MLK3 for TNF\\u2192JNK, and a ULK1-MLK3-ERK5 axis for antiviral gene induction—broadening MLK3's signaling repertoire.\",\n      \"evidence\": \"CRISPR/shRNA WDR62 loss-of-function with co-IP; ULK1-MLK3 co-IP with ERK5 and ISG readouts\",\n      \"pmids\": [\"30091641\", \"30459284\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab observations\", \"Direct ULK1 phosphorylation of MLK3 not biochemically confirmed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How MLK3 dynamically partitions among its JNK, p38, ERK/B-Raf, ERK5, and scaffold-only functions, and what governs substrate selection (e.g. direct AMPK\\u03b11 Thr172 phosphorylation) in a given cellular context, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model explaining context-dependent output switching\", \"Direct vs indirect substrate relationships (AMPK, B-Raf, Runx2) not fully reconstituted\", \"Quantitative rules coupling input strength to JNK vs ERK choice undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 4, 8, 18, 21]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 1, 8]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [10, 24]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 8, 11, 23]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9, 15, 19, 28]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [14, 20, 22]}\n    ],\n    \"complexes\": [\n      \"TRAF2\\u2013WDR62\\u2013MLK3 complex\",\n      \"GluR6\\u2013PSD-95\\u2013MLK3 complex\"\n    ],\n    \"partners\": [\n      \"MAP2K4\",\n      \"MAP2K6\",\n      \"TRAF2\",\n      \"BRAF\",\n      \"ARHGEF25\",\n      \"WDR62\",\n      \"ULK1\",\n      \"CDC42\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":8,"faith_pct":87.5}}