{"gene":"TAB1","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":1996,"finding":"TAB1 was identified as a TAK1-binding protein via yeast two-hybrid screening; TAB1 and TAK1 co-immunoprecipitate from mammalian cells, and overproduction of TAB1 increases TAK1 kinase activity and enhances TGF-β-regulated promoter activity, establishing TAB1 as an activator of TAK1 MAPKKK.","method":"Yeast two-hybrid, co-immunoprecipitation, kinase activity assay, promoter reporter assay","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP and kinase assay in mammalian cells, foundational paper replicated by many subsequent studies","pmids":["8638164"],"is_preprint":false},{"year":2000,"finding":"TAB1 activates TAK1 through a phosphorylation-dependent mechanism: association between the TAK1 kinase domain and the C-terminal region of TAB1 (C-terminal 24 amino acids required for association; additional Ser/Thr-rich sequences required for full activation) induces TAK1 autophosphorylation on two threonine residues in its activation loop.","method":"In vitro kinase assay, deletion mutagenesis, co-immunoprecipitation","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay with mutagenesis defining minimal TAB1 activation domain, single lab with multiple orthogonal methods","pmids":["10838074"],"is_preprint":false},{"year":2001,"finding":"An evolutionarily conserved PYVDXA/TXF motif in the C-terminal 30 amino acids of TAB1 is necessary for TAK1 interaction and activation; NMR revealed this region forms a unique alpha-helical structure; Phe-484 within the conserved motif is critical for TAK1 binding.","method":"Deletion and alanine-substitution mutagenesis, NMR, co-immunoprecipitation, kinase assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structural data combined with mutagenesis and kinase assay; conserved across species (C. elegans TAP-1/MOM-4 validated)","pmids":["11323434"],"is_preprint":false},{"year":2002,"finding":"TAB1 and TAK1 form a constitutively active complex when their minimal interacting domains are fused; the TAK1-TAB1 fusion protein shows intramolecular interaction (by co-IP), significant MAP3K activity in vitro, and activates JNK/p38 MAPKs and IKK in vivo, leading to IL-6 production.","method":"Co-immunoprecipitation, in vitro kinase assay, reporter assay, ELISA","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase assay with co-IP, single lab, two orthogonal methods","pmids":["12372426"],"is_preprint":false},{"year":2002,"finding":"TAB1beta, a C-terminal splice variant of TAB1 lacking the TAK1-binding domain, interacts with p38alpha but not TAK1, and stimulates p38alpha autoactivation; knockdown of TAB1beta in MDA231 cells reduced basal p38alpha activity and cell invasiveness.","method":"Co-immunoprecipitation, kinase assay, RNA interference, invasion assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and kinase assay with RNAi phenotype, single lab","pmids":["12429732"],"is_preprint":false},{"year":2002,"finding":"MAPKK-independent activation of p38alpha occurs via direct interaction with TAB1, leading to autophosphorylation and activation of p38alpha; a TRAF6-TAB1-p38alpha ternary complex was detected, and stimulus-specific TAB1-dependent and -independent p38alpha activation was demonstrated.","method":"Co-immunoprecipitation, in vitro kinase assay, dominant-negative and overexpression experiments","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay demonstrating autophosphorylation, ternary complex detection, replicated by multiple subsequent studies","pmids":["11847341"],"is_preprint":false},{"year":2002,"finding":"Targeted disruption of Tab1 in mice causes embryonic lethality with cardiovascular and lung dysmorphogenesis; Tab1-null embryonic fibroblasts display drastically reduced TAK1 kinase activity and decreased sensitivity to TGF-beta stimulation, demonstrating an essential in vivo role for TAB1 in TAK1 activation.","method":"Gene knockout (homologous recombination), embryo histology, in vitro kinase assay, TGF-beta signaling assay","journal":"Mechanisms of development","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular and developmental phenotypes, kinase activity assay in null MEFs","pmids":["12464436"],"is_preprint":false},{"year":2003,"finding":"TAK1/TAB1/NIK cascade mediates cytokine suppression of PPAR-gamma: IL-1 and TNF-alpha activate NF-kappaB through TAK1/TAB1/NIK, and activated NF-kappaB blocks PPAR-gamma DNA binding by forming a complex with PPAR-gamma and its co-activator PGC-2, thereby suppressing adipogenesis.","method":"Reporter assay, co-immunoprecipitation, dominant-negative overexpression, chromatin binding assay","journal":"Nature cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and reporter assays defining pathway, single lab with multiple methods","pmids":["12598905"],"is_preprint":false},{"year":2003,"finding":"TAB1-associated p38alpha autophosphorylation mediates ischemic p38 activation in the myocardium independent of MKK3; in ischemic (but not TNF-exposed) hearts, p38-MAPK associates with TAB1, and p38 inhibitor SB203580 reduces both TAB1-dependent p38 phosphorylation and infarction volume.","method":"Perfused heart ischemia model (mkk3-/- mice), co-immunoprecipitation, adenoviral overexpression, SB203580 pharmacology","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic (mkk3-/-) and pharmacological experiments in intact hearts, replicated by subsequent cardiac studies","pmids":["12829618"],"is_preprint":false},{"year":2004,"finding":"Phosphorylation of TAK1 at Thr-187 is essential for its activation; intermolecular autophosphorylation of Thr-187 is required; TAB1 and TAB2 both contribute to TAK1 phosphorylation but regulate it differentially; p38alpha/TAB1/TAB2-mediated feedback control suppresses TAK1 Thr-187 phosphorylation.","method":"Phospho-specific immunoblotting, alanine-substitution mutagenesis, RNAi, kinase assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — site-specific mutagenesis + phospho-antibody + RNAi in single rigorous study","pmids":["15590691"],"is_preprint":false},{"year":2004,"finding":"TAB1 expression in anergic CD4+ T cells activates p38alpha (MKK-independent) to suppress IL-2 production and promote IL-10 production, maintaining T cell anergy; inhibition of p38 or p38 dominant-negative rescued IL-2 and ERK activity in TAB1-expressing T hybridoma cells.","method":"Retroviral transduction, p38 inhibitor (SB203580), dominant-negative p38, cytokine ELISA, kinase assay","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function with multiple downstream readouts, single lab","pmids":["15282297"],"is_preprint":false},{"year":2005,"finding":"Crystal structure of a TAK1 chimeric protein revealed a novel binding pocket on the TAK1 kinase domain whose shape complements a unique alpha-helix in the TAK1-binding domain of TAB1, providing structural basis for the intimate hydrophobic interaction mediating TAK1 activation by TAB1.","method":"X-ray crystallography","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure providing mechanistic basis; single lab but Tier 1 method","pmids":["16289117"],"is_preprint":false},{"year":2005,"finding":"AMPK promotes p38 MAPK activation in the ischemic heart by increasing recruitment of p38 to TAB1; TAB1 is physically associated with the alpha2 catalytic subunit of AMPK; p38 recruitment to TAB1/AMPK complexes requires AMPK activation and is reduced in AMPK-deficient hearts.","method":"AICAR treatment, transgenic kinase-dead AMPK mice, co-immunoprecipitation, ischemia model, glucose transport assay","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP in transgenic model + genetic loss-of-function with defined molecular and functional readouts","pmids":["16179588"],"is_preprint":false},{"year":2005,"finding":"TAB1 binds p38 and sequesters it in the cytoplasm, preventing p38 nuclear localization; TAB1 disrupts p38 interaction with MKK3 and redirects p38 to the cytosol; consequently, TAB1 expression antagonizes MKK3-induced downstream p38 activity and attenuates IL-1beta-induced inflammatory gene induction in cardiomyocytes.","method":"Overexpression, subcellular fractionation, co-immunoprecipitation, inflammatory gene reporter assay, confocal imaging","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — localization by imaging/fractionation tied to functional consequence, single lab with multiple methods","pmids":["16407200"],"is_preprint":false},{"year":2005,"finding":"TAK1 is dispensable (in vivo, in TAK1-null MEFs) for NF-kappaB and AP-1 activation by TNFR1, IL-1R, TLR3, and TLR4, whereas TAB1- and TAB2-null MEFs show normal activation through those pathways; TAK1 mediates IKK activation downstream of RIP1-TRAF2 (TNF) and MyD88-IRAK1-TRAF6 (IL-1).","method":"Conditional gene knockout in mice and MEFs, NF-kappaB/AP-1 reporter assay, epistasis analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis in multiple knockout MEF lines with multiple pathway readouts; landmark paper replicated independently","pmids":["16260493"],"is_preprint":false},{"year":2006,"finding":"DUSP14 (MKP6) directly interacts with TAB1 and dephosphorylates TAB1 at Ser438, leading to TAB1-TAK1 complex inactivation; DUSP14-deficient T cells show enhanced phosphorylation of the TAB1-TAK1 complex and downstream JNK and IKK, and the enhanced activation was attenuated by TAB1 shRNA knockdown.","method":"Co-immunoprecipitation, phosphatase assay, DUSP14-deficient mice, TAB1 shRNA knockdown","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct biochemical interaction with phosphatase assay, genetic KO, and RNAi rescue experiment","pmids":["24403530"],"is_preprint":false},{"year":2006,"finding":"cGMP-dependent protein kinase I (PKG I) inhibits TAB1-p38 MAPK signaling: cGMP-activated PKG I interacts with p38 MAPK (requiring the N-terminal leucine-isoleucine zipper of PKG I) and prevents TAB1 binding to p38, thereby inhibiting p38 autophosphorylation and cardiac myocyte apoptosis during ischemia/reperfusion.","method":"Co-immunoprecipitation in HEK293 cells, cardiac myocyte-restricted PKG I knockout mice, simulated I/R, point mutant analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP with point mutants defining N-terminal LIZ requirement + in vivo cardiac KO model with molecular readouts","pmids":["16943189"],"is_preprint":false},{"year":2006,"finding":"Pro412 in the C-terminus of TAB1 is essential for its interaction with p38alpha; a cryptic D-domain-like docking site adjacent to Pro412 engages the hydrophobic docking groove of p38alpha; p38alpha residues Thr218 and Ile275 (not found in p38beta) are required for specific TAB1 binding and TAB1-induced autophosphorylation.","method":"Deletion and point mutagenesis, co-immunoprecipitation, chimeric p38alpha/p38beta analysis, kinase assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — structure-guided mutagenesis with kinase and binding assays, single rigorous study","pmids":["16648477"],"is_preprint":false},{"year":2006,"finding":"TGF-beta3/TbetaR1 complex associates with adaptor TAB1 to activate both p38 MAPK and ERK signaling pathways, disrupting both the blood-testis barrier and Sertoli-germ cell adhesion; when TbetaRI preferentially associates with CD2AP instead of TAB1, only Sertoli-germ cell adhesion is perturbed, demonstrating differential signal routing by adaptor association.","method":"Co-immunoprecipitation, in vitro Sertoli cell TJ assay, in vivo TGF-beta3 administration, dominant-negative constructs","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and functional barrier assay, single lab with in vitro and in vivo data","pmids":["16617054"],"is_preprint":false},{"year":2007,"finding":"The BIR1 domain of XIAP directly interacts with TAB1 to induce NF-kappaB activation via TAK1; crystal structures of BIR1, TAB1, and the BIR1/TAB1 complex revealed a butterfly-shaped BIR1 dimer; structure-based mutagenesis and TAB1 knockdown confirmed BIR1/TAB1 interaction is crucial for XIAP-induced TAK1 and NF-kappaB activation; Smac (caspase-inhibition antagonist) also inhibits the XIAP/TAB1 interaction.","method":"X-ray crystallography, surface plasmon resonance, structure-based mutagenesis, TAB1 knockdown, NF-kappaB reporter assay","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure of complex plus mutagenesis and RNAi validation, multiple orthogonal methods","pmids":["17560374"],"is_preprint":false},{"year":2008,"finding":"TAB1 is required for TAK1 catalytic activity: TAK1 activity is undetectable in Tab1-/- MEFs after IL-1 or TNF stimulation. TAB1 is also required for p38alpha-mediated phosphorylation of TAB3 (at Ser60 and Thr404) within the TAK1 complex, acting as a scaffold that recruits p38alpha to TAK1.","method":"Tab1-/- MEF kinase assay, mass spectrometry phosphosite mapping, genetic epistasis with p38alpha/beta MAPK inhibitors","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — kinase assay in null MEFs + MS phosphosite identification + multiple genetic backgrounds tested","pmids":["18021073"],"is_preprint":false},{"year":2008,"finding":"TAB1 interacts with IKKbeta to form TAB1:IKKbeta complexes in breast cancer cells undergoing EMT, leading to stimulation of a TAK1:IKKbeta:p65 pathway and NF-kappaB activation; a truncated TAB1(411) mutant reduced TGF-beta-mediated NF-kappaB activation and tumor growth.","method":"Co-immunoprecipitation, truncation mutant expression, NF-kappaB reporter, tumor xenograft","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP defining novel TAB1:IKKbeta complex + functional truncation mutant + in vivo tumor model, single lab","pmids":["18316610"],"is_preprint":false},{"year":2008,"finding":"TAB1 mediates osmotic stress-induced TAK1 activation (but is dispensable for TNF- or IL-1-induced TAK1 activation in MEFs); the C-terminal 68 amino acids of TAB1 are sufficient for osmotic stress-induced TAK1 activation; cell shrinkage increases TAB1-TAK1 concentration, promoting oligomerization-dependent TAK1 activation.","method":"Tab1-/- MEFs, osmotic stress assay, TAB1 truncation mutants, kinase assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic null MEFs with defined stimulus specificity and domain mapping, single lab with multiple methods","pmids":["18829460"],"is_preprint":false},{"year":2008,"finding":"TAB4 (TIP) binds TAK1 directly, enhances TAK1 autophosphorylation, and stimulates phosphorylation of two sites in TAB1 as identified by mass spectrometry; TAB4 selectively promotes IKK phosphorylation and NF-kappaB signaling.","method":"Co-immunoprecipitation, mass spectrometry phosphosite identification, in vitro kinase assay, NF-kappaB reporter","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS-defined phosphosites on TAB1 + kinase assay, single lab","pmids":["18456659"],"is_preprint":false},{"year":2009,"finding":"TAK1-TAB1-TAB2 complex phosphorylates RCAN1 at Ser94 and Ser136, converting RCAN1 from an inhibitor to a facilitator of calcineurin-NFAT signaling; calcineurin in turn dephosphorylates and inhibits TAK1 and TAB1, forming a bidirectional regulatory loop; TAB2 bridges the TAK1-TAB1 and calcineurin-NFAT modules.","method":"In vitro kinase assay, co-immunoprecipitation, NFAT transcriptional reporter, cardiomyocyte hypertrophy assay, Rcan1/2- and Tab2-deficient MEFs","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro phosphorylation assay with defined sites + genetic null MEFs + multiple functional readouts","pmids":["19136967"],"is_preprint":false},{"year":2009,"finding":"TGF-beta1-induced TAK1 activation in mesangial cells requires TAB1-mediated autophosphorylation and does not require TbetaRI kinase activity; TAB1 does not interact with TGF-beta receptors but is indispensable for TGF-beta1-induced TAK1 activation.","method":"Kinase-dead TbetaRI mutant, co-immunoprecipitation, kinase assay, deletion mutant analysis","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase assay with receptor mutants + Co-IP, single lab","pmids":["19556242"],"is_preprint":false},{"year":2012,"finding":"TAB1 is O-GlcNAcylated on a single site, Ser395 (human), induced by IL-1 and osmotic stress; O-GlcNAcylation of TAB1 is required for full TAK1 activation upon IL-1/osmotic stress stimulation, and for downstream NF-kappaB activation and IL-6/TNFalpha production; the S395A O-GlcNAc-deficient TAB1 mutant fails to fully rescue signaling in Tab1-/- MEFs.","method":"O-GlcNAc-specific antibody, site-directed mutagenesis (S395A), Tab1-/- MEF reconstitution, kinase assay, ELISA","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — PTM site identified by MS + site-specific antibody + genetic reconstitution in null MEFs with multiple downstream readouts","pmids":["22307082"],"is_preprint":false},{"year":2013,"finding":"p38alpha autophosphorylation initiated by TAB1 occurs in cis by direct interaction with TAB1 residues 371-416; crystal structures of the p38alpha-TAB1 complex revealed a bipartite docking site on the p38alpha C-terminal lobe; TAB1 binding stabilizes active p38alpha and induces helical extension of the Thr-Gly-Tyr motif in the activation segment allowing autophosphorylation in cis; a cell-permeable TAT-TAB1(371-416) peptide rapidly activates p38 and perturbs cardiac function.","method":"X-ray crystallography, chemical-genetic approaches, coexpression in mammalian/bacterial/cell-free systems, FRET, isolated cardiac myocytes and perfused mouse hearts","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure + chemical-genetic in cis mechanism + multiple expression systems + in vitro and in vivo cardiac validation","pmids":["24037507"],"is_preprint":false},{"year":2013,"finding":"USP18 deubiquitinates the TAK1-TAB1 complex, thereby restricting TAK1 activity; USP18-deficient T cells exhibit hyperactivation of NF-kappaB and NFAT and elevated IL-2, and USP18 physically associates with the TAK1-TAB1 complex.","method":"Co-immunoprecipitation, USP18-deficient mouse T cells, NF-kappaB/NFAT reporter assay, ubiquitination assay","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP + genetic KO with functional readouts, single lab","pmids":["23825189"],"is_preprint":false},{"year":2013,"finding":"TAB1 associates with MDM2 and inhibits its E3 ligase activity toward p53 and MDMX; p38alpha activated by TAB1 phosphorylates p53 N-terminal sites leading to selective induction of NOXA; TAB1-dependent MDMX stabilization is required for cell death after cisplatin treatment; TAB1 depletion inhibits MDM2 siRNA-mediated p53 accumulation.","method":"Co-immunoprecipitation, E3 ligase assay, siRNA knockdown, p53 target gene analysis, cell viability assay","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP + E3 ligase assay + RNAi phenotype, single lab with multiple methods","pmids":["23934659"],"is_preprint":false},{"year":2014,"finding":"TAB1 is identified as the direct binding target of triptolide (TP) in macrophages; TP inhibits TAK1 kinase activity by interfering with TAK1-TAB1 complex formation; the amino acid sequence between positions 373 and 502 of TAB1 is required for TP interaction.","method":"Pull-down assay, in vitro kinase assay, deletion mutagenesis, MAPK pathway inhibition assay","journal":"Chemistry & biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pull-down + kinase assay with domain mapping, single lab","pmids":["24462677"],"is_preprint":false},{"year":2014,"finding":"EV71 3C protease cleaves TAB1 at Q414-G415 and Q451-S452 (as well as TAK1 and TAB2/TAB3), disrupting the TAK1/TAB complex and inhibiting NF-kappaB activation; 3C active-site mutants (H40D or C147S) abolish cleavage activity.","method":"In vitro cleavage assay, active-site mutagenesis, NF-kappaB luciferase reporter, overexpression in mammalian cells","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro cleavage with site mutagenesis + functional NF-κB readout, single lab","pmids":["24942571"],"is_preprint":false},{"year":2014,"finding":"In senescent human T cells, AMPK triggers recruitment of p38 to the scaffold protein TAB1, causing autophosphorylation of p38 via an intrasensory (non-canonical) pathway; this AMPK-TAB1-p38 pathway inhibits telomerase activity, T cell proliferation, and TCR signalosome components; blockade of AMPK-TAB1-dependent p38 activation reverses the proliferative defect.","method":"Co-immunoprecipitation, AMPK inhibition, p38 inhibition, T cell functional assays (telomerase, proliferation)","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP + pharmacological inhibition with multiple functional readouts in primary human T cells","pmids":["25151490"],"is_preprint":false},{"year":2014,"finding":"MEKK1 PHD motif mediates Lys63-linked polyubiquitination of TAB1 (using conjugating enzyme UBE2N), regulating TAK1 and MAPK activation by TGF-beta and EGF; protein microarray identified TAB1 as a PHD substrate; Map3k1(mPHD) ES cells exhibit defective non-canonical ubiquitination of TAB1.","method":"Protein microarray substrate identification, in vitro ubiquitination assay, Map3k1 PHD knock-in mouse ES cells, MAPK activation assay","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro ubiquitination assay + genetic knock-in model identifying TAB1 as substrate, single lab","pmids":["25260751"],"is_preprint":false},{"year":2015,"finding":"E3 ubiquitin ligase Itch binds TAB1 through a conserved PPXY motif and ubiquitylates it, inhibiting p38alpha activation; knockdown of TAB1 attenuated prolonged p38alpha phosphorylation in Itch-/- cells; reconstitution with wild-type but not ligase-dead Itch-C830A inhibited p38alpha phosphorylation; a cell-permeable peptide blocking TAB1-p38alpha interaction attenuated skin inflammation.","method":"Co-immunoprecipitation, ubiquitination assay, shRNA knockdown, Itch-/- mouse model, reconstitution assay","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct binding + ubiquitination assay + genetic rescue + in vivo mouse model with multiple orthogonal methods","pmids":["25714464"],"is_preprint":false},{"year":2017,"finding":"E3 ubiquitin ligase RNF114 mediates ubiquitination and proteasomal degradation of TAB1 during maternal-to-zygotic transition; TAB1 degradation activates the NF-kappaB pathway and is required for MZT; five substrates of RNF114 were identified by protein microarray and validated by in vitro ubiquitination.","method":"Protein microarray, in vitro ubiquitination assay, Rnf114 knockdown in mouse oocytes, NF-kappaB activity assay","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro ubiquitination assay + functional embryo knockdown + NF-kappaB readout, single lab","pmids":["28073917"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of active pp38alpha-TAB1(1-438) complex defined 4 residues on TAB1 required for docking onto p38alpha; global TAB1 knock-in (KI) mice with these substitutions are viable; KI mice show significantly reduced infarction volume after in vivo ischemia and disabled TAB1 transphosphorylation, with only mild attenuation of myocardial p38alpha activation.","method":"X-ray crystallography, global knock-in mouse model, in vivo regional ischemia, infarction measurement, fragment screening","journal":"JCI insight","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure + knock-in mouse with defined mechanistic phenotype + in vivo ischemia model","pmids":["30135318"],"is_preprint":false},{"year":2018,"finding":"p38alpha autoactivation by TAB1 is critically dependent on Thr185 of p38alpha: replacing Thr185 with Gly (T185G) prevents an intramolecular hydrogen bond with Asp150, disrupting TAB1-induced conformational change in the activation segment without affecting TAB1 binding, upstream MAP2K activation, or downstream substrate phosphorylation; T185G p38alpha-expressing cardiac cells are resistant to ischemia injury.","method":"Crystal structure-guided mutagenesis, in vitro kinase assay, cardiac myocyte ischemia model, in vivo mouse assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — structure-guided mutagenesis + in vitro and in vivo validation with multiple mechanistic controls","pmids":["29229647"],"is_preprint":false},{"year":2018,"finding":"Alpha-synuclein disrupts the anti-inflammatory effect of dopamine D2 receptor (Drd2) in astrocytes by inhibiting the association of beta-arrestin2 with TAB1, thereby promoting TAK1-TAB1 interaction and downstream neuroinflammation.","method":"Co-immunoprecipitation, Western blotting, beta-arrestin2 overexpression, primary astrocyte assay, A53T transgenic mice","journal":"Journal of neuroinflammation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP defining competitive interaction + genetic/pharmacological manipulation, single lab","pmids":["30200997"],"is_preprint":false},{"year":2019,"finding":"Multiple GPCR agonists (thrombin, histamine, prostaglandin E2, ADP) activate p38 MAPK via a non-canonical TAB1-TAB2 and/or TAB1-TAB3-dependent autophosphorylation pathway in endothelial cells, with MKK3/6 activation virtually undetectable; cell-type-specific dependence on TAB1-TAB2 versus TAB1-TAB3 was demonstrated by siRNA knockdown.","method":"siRNA knockdown (TAB1, TAB2, TAB3), p38 autophosphorylation assay, MKK3/6 phosphorylation assay, IL-6 ELISA, multiple endothelial cell types","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi knockdown in multiple cell types with defined molecular phenotype, single lab","pmids":["30760523"],"is_preprint":false},{"year":2021,"finding":"SARS-CoV-2 NSP5 (3CLpro) directly cleaves TAB1 in vitro; cleavage is specific and selective, providing a potential mechanism for enhanced cytokine production in COVID-19.","method":"In vitro cleavage assay with recombinant proteases","journal":"Emerging microbes & infections","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro protease cleavage assay, single study, abstract does not detail full mutagenesis","pmids":["33372854"],"is_preprint":false},{"year":2021,"finding":"TRIM26 catalyzes K11-linked polyubiquitination of TAB1 at Lys294, Lys319, and Lys335, enhancing TAK1 activation and downstream NF-kappaB and MAPK signaling; Trim26-knockout mice show reduced TAK1 activation and proinflammatory cytokine induction after LPS/TNF/IL-1beta stimulation and are protected from LPS-induced septic shock.","method":"In vitro ubiquitination assay, site-directed mutagenesis, Trim26-KO and Trim26-transgenic mice, kinase assay, septic shock model, DSS colitis model","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro ubiquitination + site mutagenesis + genetic KO and transgenic mice with in vivo disease models","pmids":["34017102"],"is_preprint":false},{"year":2022,"finding":"GFAT1 interacts with TAB1 in a TAB1-Ser438 phosphorylation-dependent manner upon glucose deprivation; GFAT1 binding facilitates TTLL5-GFAT1-TAB1 complex formation; GFAT1 metabolic activity provides glutamate for TTLL5-mediated TAB1 glutamylation; glutamylated TAB1 recruits p38alpha MAPK to drive p38 activation and promote autophagy for tumor cell survival.","method":"Co-immunoprecipitation, mass spectrometry, site-directed mutagenesis (S438A), TTLL5 glutamylation assay, p38 activation assay, autophagy assay","journal":"Cell discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP + MS-defined glutamylation site + TTLL5 enzymatic assay + functional readout, single lab","pmids":["35945223"],"is_preprint":false},{"year":2023,"finding":"RNF207 promotes K63-linked ubiquitination of TAB1, triggering TAK1 autophosphorylation and activation of downstream p38 and JNK1/2, exacerbating pathological cardiac hypertrophy; TAB1 knockdown attenuated RNF207-overexpression-induced cardiomyocyte hypertrophy.","method":"Co-immunoprecipitation, in vitro ubiquitination assay, TAC mouse model, TAB1 knockdown in cardiomyocytes","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay + in vivo TAC model + TAB1 KD rescue, single lab","pmids":["35352799"],"is_preprint":false}],"current_model":"TAB1 (MAP3K7IP1) is a scaffold/adaptor protein that constitutively binds TAK1 through a C-terminal alpha-helical domain (containing the PYVDXA/TXF motif and critical Phe484), inducing TAK1 autophosphorylation on Thr187 and thereby activating TAK1 kinase activity toward IKK and MKK3/6 in cytokine (IL-1, TNF), TGF-beta, and osmotic stress signaling; TAB1 also directly binds p38alpha at its hydrophobic docking groove (requiring p38alpha Thr218 and Ile275), inducing p38alpha autophosphorylation in cis (dependent on p38alpha Thr185) to activate p38 independently of MKKs in contexts such as myocardial ischemia, T-cell senescence, and GPCR signaling; TAB1 activity is regulated by multiple post-translational modifications including O-GlcNAcylation (Ser395, required for full TAK1 activation), K11-linked ubiquitination by TRIM26 (activating), K63-linked ubiquitination by RNF207 (activating in cardiac hypertrophy), ubiquitination and degradation by RNF114 (during MZT), ubiquitination by the MEKK1 PHD, dephosphorylation by DUSP14 at Ser438 (inactivating), and direct interaction with XIAP BIR1 domain (linking BMP receptor signaling to TAK1-NF-kappaB activation); viral proteases (EV71 3C, SARS-CoV-2 NSP5) cleave TAB1 to disrupt inflammatory signaling."},"narrative":{"mechanistic_narrative":"TAB1 (MAP3K7IP1) is a scaffold/adaptor protein that activates stress- and cytokine-responsive MAP kinase signaling by directly engaging and allosterically activating two distinct kinases [PMID:8638164, PMID:11847341]. Through a C-terminal alpha-helical domain bearing a conserved PYVDXA/TXF motif and the critical Phe484, TAB1 binds the TAK1 kinase domain via a complementary hydrophobic pocket and induces TAK1 autophosphorylation on activation-loop threonines (Thr187), thereby driving TAK1 catalytic activity toward downstream IKK/NF-kappaB and MAPK modules [PMID:10838074, PMID:11323434, PMID:15590691, PMID:16289117]; TAB1 is essential in vivo, as Tab1-null embryos die with cardiovascular and lung defects and Tab1-null fibroblasts show abolished TAK1 activity after IL-1/TNF and reduced TGF-beta responsiveness [PMID:12464436, PMID:18021073], with TAB1 selectively required for osmotic stress- and TGF-beta-induced TAK1 activation rather than all cytokine inputs [PMID:18829460, PMID:19556242]. Independently of upstream MAP2Ks, TAB1 binds p38alpha at a bipartite docking site on its C-terminal lobe (engaging p38alpha residues Thr218/Ile275 via a cryptic D-domain-like site near Pro412) and induces p38alpha autophosphorylation in cis, a conformational mechanism that stabilizes the active kinase and depends on p38alpha Thr185 [PMID:11847341, PMID:16648477, PMID:24037507, PMID:29229647]. This non-canonical TAB1-p38alpha axis operates in myocardial ischemia, where AMPK promotes p38 recruitment to TAB1 to drive ischemic injury [PMID:12829618, PMID:16179588, PMID:30135318], in CD4+ T-cell anergy and senescence [PMID:15282297, PMID:25151490], and in GPCR signaling in endothelium [PMID:30760523]. TAB1 activity is tuned by an extensive PTM network: activating O-GlcNAcylation at Ser395 [PMID:22307082], activating TRIM26-mediated K11-linked and RNF207-mediated K63-linked ubiquitination [PMID:34017102, PMID:35352799], inactivating DUSP14-mediated dephosphorylation at Ser438 [PMID:24403530], MEKK1-PHD- and Itch-mediated ubiquitination [PMID:25260751, PMID:25714464], and RNF114-driven degradation during the maternal-to-zygotic transition [PMID:28073917]. TAB1 further links to NF-kappaB activation through direct interaction with the XIAP BIR1 domain and with IKKbeta [PMID:17560374, PMID:18316610], and viral proteases (EV71 3C, SARS-CoV-2 NSP5) cleave TAB1 to disrupt inflammatory signaling [PMID:24942571, PMID:33372854].","teleology":[{"year":1996,"claim":"Established TAB1 as a physical and functional activator of the TAK1 MAP3K, answering how TAK1 is engaged in TGF-beta-regulated transcription.","evidence":"Yeast two-hybrid, reciprocal co-IP, kinase assay and promoter reporter in mammalian cells","pmids":["8638164"],"confidence":"High","gaps":["Did not define the binding interface or the molecular mechanism of activation","Did not establish in vivo requirement"]},{"year":2001,"claim":"Defined the structural basis of TAK1 engagement, mapping activation to a conserved C-terminal PYVDXA/TXF motif forming a unique alpha-helix with Phe484 as the critical contact.","evidence":"Deletion/alanine mutagenesis, NMR, co-IP and kinase assay; conservation validated in C. elegans","pmids":["10838074","11323434"],"confidence":"High","gaps":["Atomic-resolution view of the TAK1 pocket not yet available","Did not address how stimulus specificity is achieved"]},{"year":2002,"claim":"Revealed a second, MAP2K-independent function: TAB1 directly binds p38alpha and induces its autophosphorylation, defining a non-canonical p38 activation route.","evidence":"Co-IP, in vitro kinase assay, dominant-negative/overexpression, TRAF6-TAB1-p38alpha ternary complex detection; splice-variant TAB1beta analysis","pmids":["11847341","12429732","12372426"],"confidence":"High","gaps":["Mechanism of cis-autophosphorylation not yet resolved","p38alpha docking residues not yet mapped"]},{"year":2002,"claim":"Demonstrated the essential in vivo role of TAB1 for TAK1 activation and embryonic development.","evidence":"Tab1 knockout mice, embryo histology, kinase assay in null MEFs, TGF-beta signaling assay","pmids":["12464436"],"confidence":"High","gaps":["Did not separate TAK1-dependent from p38-dependent developmental functions","Cell-type-specific requirements not addressed"]},{"year":2004,"claim":"Resolved the activating phosphorylation event (TAK1 Thr187 intermolecular autophosphorylation) and revealed feedback control by a p38alpha/TAB1/TAB2 loop.","evidence":"Phospho-specific immunoblotting, alanine mutagenesis, RNAi, kinase assay","pmids":["15590691"],"confidence":"High","gaps":["Differential contributions of TAB1 vs TAB2 to TAK1 phosphorylation not fully separated","Feedback kinetics in physiological settings unclear"]},{"year":2005,"claim":"Provided the atomic structural basis for TAK1 activation, showing a TAK1-domain pocket complementary to the TAB1 alpha-helix.","evidence":"X-ray crystallography of a TAK1 chimeric protein","pmids":["16289117"],"confidence":"High","gaps":["Used a chimeric construct rather than the native complex","Did not capture full-length regulatory regions"]},{"year":2005,"claim":"Linked the non-canonical TAB1-p38 axis to disease physiology, showing it drives ischemic p38 activation in myocardium and is potentiated by AMPK recruitment.","evidence":"mkk3-/- perfused hearts, AICAR/kinase-dead AMPK transgenic mice, co-IP, SB203580 pharmacology","pmids":["12829618","16179588"],"confidence":"High","gaps":["How AMPK physically promotes p38-TAB1 assembly not structurally defined","Whether AMPK directly modifies TAB1 unresolved"]},{"year":2006,"claim":"Mapped the p38alpha docking determinants (TAB1 Pro412 cryptic D-site; p38alpha Thr218/Ile275) explaining isoform-specific TAB1-p38alpha engagement and revealed negative regulators (PKG I, cytoplasmic sequestration).","evidence":"Point/chimeric mutagenesis, co-IP, kinase assay, subcellular fractionation, cardiac PKG I knockout","pmids":["16648477","16943189","16407200"],"confidence":"High","gaps":["Conformational mechanism of induced autophosphorylation still unresolved at this stage","Physiological balance between sequestration and activation unclear"]},{"year":2007,"claim":"Defined a structural NF-kappaB-activating input, showing the XIAP BIR1 domain dimer directly binds TAB1 to drive TAK1-dependent NF-kappaB activation.","evidence":"Crystallography of BIR1/TAB1 complex, SPR, structure-based mutagenesis, TAB1 knockdown, NF-kappaB reporter","pmids":["17560374"],"confidence":"High","gaps":["In vivo significance of XIAP-TAB1 axis not established","How Smac antagonism is regulated physiologically unclear"]},{"year":2008,"claim":"Established TAB1 as an obligate scaffold for TAK1 catalysis and for recruiting p38alpha into the TAK1 complex, and defined stimulus-specific requirement (osmotic stress vs cytokines).","evidence":"Tab1-/- MEF kinase assays, MS phosphosite mapping of TAB3, osmotic stress and truncation analyses; IKKbeta complex and TAB4 phosphosite studies","pmids":["18021073","18829460","18316610","18456659"],"confidence":"High","gaps":["Reconciliation with reports that TAK1/TAB1 are dispensable for some cytokine pathways incomplete","Quantitative stoichiometry of the scaffold complex unknown"]},{"year":2009,"claim":"Embedded the TAK1-TAB1 complex in a calcineurin-NFAT regulatory loop via RCAN1 phosphorylation, and showed TGF-beta activation of TAK1 occurs without receptor kinase activity.","evidence":"In vitro kinase assay with defined RCAN1 sites, co-IP, NFAT reporter, Tab2/Rcan-null MEFs; kinase-dead TbetaRI analysis","pmids":["19136967","19556242"],"confidence":"High","gaps":["How TGF-beta signal reaches TAB1 without receptor binding unresolved","Tissue specificity of the calcineurin crosstalk unclear"]},{"year":2012,"claim":"Identified O-GlcNAcylation of TAB1 at Ser395 as a metabolic PTM required for full TAK1 activation and downstream cytokine output.","evidence":"O-GlcNAc antibody, S395A mutagenesis, Tab1-/- MEF reconstitution, kinase assay, ELISA","pmids":["22307082"],"confidence":"High","gaps":["The O-GlcNAc transferase responsible not identified here","Structural effect of Ser395 modification on TAK1 binding unknown"]},{"year":2013,"claim":"Solved the cis-autophosphorylation mechanism: TAB1(371-416) docks a bipartite site on p38alpha, stabilizing active conformation and enabling intramolecular activation-loop phosphorylation.","evidence":"Crystallography of p38alpha-TAB1 complex, chemical-genetics, FRET, cardiac myocyte/perfused heart with TAT-TAB1 peptide; USP18 and MDM2/p53 regulatory studies","pmids":["24037507","23825189","23934659"],"confidence":"High","gaps":["How docking is dynamically regulated by upstream stimuli unclear","Generality of the MDM2/p53 link across tissues unestablished"]},{"year":2014,"claim":"Extended the AMPK-TAB1-p38 axis to T-cell senescence and expanded the PTM regulatory layer (MEKK1-PHD K63 ubiquitination); identified pharmacological/viral disruption of TAB1.","evidence":"Co-IP and inhibitor studies in primary human T cells, protein microarray/in vitro ubiquitination, triptolide pull-down, EV71 3C cleavage assays","pmids":["25151490","25260751","24462677","24942571"],"confidence":"High","gaps":["Direct physical AMPK-TAB1-p38 architecture not solved","In vivo relevance of MEKK1-PHD ubiquitination of TAB1 limited"]},{"year":2015,"claim":"Identified Itch as a ubiquitin ligase binding TAB1 via a PPXY motif to restrain p38alpha activation, with therapeutic peptide disruption of TAB1-p38 reducing inflammation.","evidence":"Co-IP, ubiquitination assay, shRNA, Itch-/- mice, reconstitution with ligase-dead Itch, cell-permeable peptide","pmids":["25714464"],"confidence":"High","gaps":["Ubiquitination linkage type and target lysines on TAB1 not fully defined","Crosstalk with activating ubiquitin ligases unresolved"]},{"year":2018,"claim":"Provided definitive structural and genetic proof that TAB1-driven p38alpha cis-autophosphorylation mediates ischemic injury, via docking-site and Thr185-dependent conformational mechanisms.","evidence":"Crystallography of pp38alpha-TAB1(1-438), TAB1 and p38alpha T185G knock-in mice, in vivo regional ischemia","pmids":["30135318","29229647"],"confidence":"High","gaps":["Residual MKK-dependent p38 activation complicates clean separation in vivo","Therapeutic targeting feasibility not yet established"]},{"year":2021,"claim":"Established activating K11-linked ubiquitination of TAB1 by TRIM26 as a driver of inflammatory TAK1 signaling with in vivo disease relevance.","evidence":"In vitro ubiquitination, site mutagenesis (K294/319/335), Trim26-KO and transgenic mice, septic shock and DSS colitis models","pmids":["34017102"],"confidence":"High","gaps":["How K11 chains structurally promote TAK1 activation unclear","Interplay with other TAB1 ubiquitin ligases not mapped"]},{"year":2023,"claim":"Linked metabolic and ubiquitin signals to cardiac and tumor pathology through TAB1 (RNF207 K63 ubiquitination; GFAT1/TTLL5 glutamylation recruiting p38alpha for autophagy).","evidence":"Co-IP, in vitro ubiquitination, TAC mouse model, S438-dependent GFAT1 binding, TTLL5 glutamylation and autophagy assays","pmids":["35352799","35945223"],"confidence":"Medium","gaps":["Single-lab findings without independent replication","Structural basis of glutamylation-driven p38alpha recruitment unknown"]},{"year":null,"claim":"How the diverse activating and inhibitory PTMs on TAB1 are integrated to set context-specific TAK1 versus p38alpha output remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model reconciling competing ubiquitin, O-GlcNAc, glutamylation and phosphorylation marks","Quantitative determinants of TAB1 partitioning between TAK1 and p38alpha complexes unknown","Stoichiometry and dynamics of native TAB1 complexes in vivo undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,5,9,20,27]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,5,20,19]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,9,11,27,26]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[13]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[13]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,14,15,32,41]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,5,8,39]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[22,8,26]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[6,18,35]}],"complexes":["TAK1-TAB1-TAB2 complex","p38alpha-TAB1 complex"],"partners":["MAP3K7","MAPK14","XIAP","IKBKB","DUSP14","TRIM26","PRKAA2","ITCH"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15750","full_name":"TGF-beta-activated kinase 1 and MAP3K7-binding protein 1","aliases":["Mitogen-activated protein kinase kinase kinase 7-interacting protein 1","TGF-beta-activated kinase 1-binding protein 1","TAK1-binding protein 1"],"length_aa":504,"mass_kda":54.6,"function":"Key adapter protein that plays an essential role in JNK and NF-kappa-B activation and proinflammatory cytokines production in response to stimulation with TLRs and cytokines (PubMed:22307082, PubMed:24403530). Mechanistically, associates with the catalytic domain of MAP3K7/TAK1 to trigger MAP3K7/TAK1 autophosphorylation leading to its full activation (PubMed:10838074, PubMed:25260751, PubMed:37832545). Similarly, associates with MAPK14 and triggers its autophosphorylation and subsequent activation (PubMed:11847341, PubMed:29229647). In turn, MAPK14 phosphorylates TAB1 and inhibits MAP3K7/TAK1 activation in a feedback control mechanism (PubMed:14592977). Also plays a role in recruiting MAPK14 to the TAK1 complex for the phosphorylation of the TAB2 and TAB3 regulatory subunits (PubMed:18021073)","subcellular_location":"Cytoplasm, cytosol; Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q15750/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TAB1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"MAP3K7","stoichiometry":10.0},{"gene":"CAPZB","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TAB1","total_profiled":1310},"omim":[{"mim_id":"613363","title":"DYNEIN, CYTOPLASMIC 2, INTERMEDIATE CHAIN 2; DYNC2I2","url":"https://www.omim.org/entry/613363"},{"mim_id":"608668","title":"ZINC FINGER MYND DOMAIN-CONTAINING PROTEIN 11; ZMYND11","url":"https://www.omim.org/entry/608668"},{"mim_id":"605101","title":"TAK1-BINDING PROTEIN 2; TAB2","url":"https://www.omim.org/entry/605101"},{"mim_id":"602615","title":"TAK1-BINDING PROTEIN 1; TAB1","url":"https://www.omim.org/entry/602615"},{"mim_id":"602614","title":"MITOGEN-ACTIVATED PROTEIN KINASE KINASE KINASE 7; MAP3K7","url":"https://www.omim.org/entry/602614"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TAB1"},"hgnc":{"alias_symbol":[],"prev_symbol":["MAP3K7IP1"]},"alphafold":{"accession":"Q15750","domains":[{"cath_id":"3.60.40.10","chopping":"18-34_46-364","consensus_level":"medium","plddt":94.6377,"start":18,"end":364}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15750","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15750-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15750-F1-predicted_aligned_error_v6.png","plddt_mean":78.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TAB1","jax_strain_url":"https://www.jax.org/strain/search?query=TAB1"},"sequence":{"accession":"Q15750","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15750.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15750/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15750"}},"corpus_meta":[{"pmid":"16260493","id":"PMC_16260493","title":"TAK1, but not TAB1 or TAB2, 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TAB1 and TAK1 co-immunoprecipitate from mammalian cells, and overproduction of TAB1 increases TAK1 kinase activity and enhances TGF-β-regulated promoter activity, establishing TAB1 as an activator of TAK1 MAPKKK.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, kinase activity assay, promoter reporter assay\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP and kinase assay in mammalian cells, foundational paper replicated by many subsequent studies\",\n      \"pmids\": [\"8638164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"TAB1 activates TAK1 through a phosphorylation-dependent mechanism: association between the TAK1 kinase domain and the C-terminal region of TAB1 (C-terminal 24 amino acids required for association; additional Ser/Thr-rich sequences required for full activation) induces TAK1 autophosphorylation on two threonine residues in its activation loop.\",\n      \"method\": \"In vitro kinase assay, deletion mutagenesis, co-immunoprecipitation\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay with mutagenesis defining minimal TAB1 activation domain, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"10838074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"An evolutionarily conserved PYVDXA/TXF motif in the C-terminal 30 amino acids of TAB1 is necessary for TAK1 interaction and activation; NMR revealed this region forms a unique alpha-helical structure; Phe-484 within the conserved motif is critical for TAK1 binding.\",\n      \"method\": \"Deletion and alanine-substitution mutagenesis, NMR, co-immunoprecipitation, kinase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structural data combined with mutagenesis and kinase assay; conserved across species (C. elegans TAP-1/MOM-4 validated)\",\n      \"pmids\": [\"11323434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TAB1 and TAK1 form a constitutively active complex when their minimal interacting domains are fused; the TAK1-TAB1 fusion protein shows intramolecular interaction (by co-IP), significant MAP3K activity in vitro, and activates JNK/p38 MAPKs and IKK in vivo, leading to IL-6 production.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, reporter assay, ELISA\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase assay with co-IP, single lab, two orthogonal methods\",\n      \"pmids\": [\"12372426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TAB1beta, a C-terminal splice variant of TAB1 lacking the TAK1-binding domain, interacts with p38alpha but not TAK1, and stimulates p38alpha autoactivation; knockdown of TAB1beta in MDA231 cells reduced basal p38alpha activity and cell invasiveness.\",\n      \"method\": \"Co-immunoprecipitation, kinase assay, RNA interference, invasion assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and kinase assay with RNAi phenotype, single lab\",\n      \"pmids\": [\"12429732\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"MAPKK-independent activation of p38alpha occurs via direct interaction with TAB1, leading to autophosphorylation and activation of p38alpha; a TRAF6-TAB1-p38alpha ternary complex was detected, and stimulus-specific TAB1-dependent and -independent p38alpha activation was demonstrated.\",\n      \"method\": \"Co-immunoprecipitation, in vitro kinase assay, dominant-negative and overexpression experiments\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay demonstrating autophosphorylation, ternary complex detection, replicated by multiple subsequent studies\",\n      \"pmids\": [\"11847341\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Targeted disruption of Tab1 in mice causes embryonic lethality with cardiovascular and lung dysmorphogenesis; Tab1-null embryonic fibroblasts display drastically reduced TAK1 kinase activity and decreased sensitivity to TGF-beta stimulation, demonstrating an essential in vivo role for TAB1 in TAK1 activation.\",\n      \"method\": \"Gene knockout (homologous recombination), embryo histology, in vitro kinase assay, TGF-beta signaling assay\",\n      \"journal\": \"Mechanisms of development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular and developmental phenotypes, kinase activity assay in null MEFs\",\n      \"pmids\": [\"12464436\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TAK1/TAB1/NIK cascade mediates cytokine suppression of PPAR-gamma: IL-1 and TNF-alpha activate NF-kappaB through TAK1/TAB1/NIK, and activated NF-kappaB blocks PPAR-gamma DNA binding by forming a complex with PPAR-gamma and its co-activator PGC-2, thereby suppressing adipogenesis.\",\n      \"method\": \"Reporter assay, co-immunoprecipitation, dominant-negative overexpression, chromatin binding assay\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and reporter assays defining pathway, single lab with multiple methods\",\n      \"pmids\": [\"12598905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TAB1-associated p38alpha autophosphorylation mediates ischemic p38 activation in the myocardium independent of MKK3; in ischemic (but not TNF-exposed) hearts, p38-MAPK associates with TAB1, and p38 inhibitor SB203580 reduces both TAB1-dependent p38 phosphorylation and infarction volume.\",\n      \"method\": \"Perfused heart ischemia model (mkk3-/- mice), co-immunoprecipitation, adenoviral overexpression, SB203580 pharmacology\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic (mkk3-/-) and pharmacological experiments in intact hearts, replicated by subsequent cardiac studies\",\n      \"pmids\": [\"12829618\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Phosphorylation of TAK1 at Thr-187 is essential for its activation; intermolecular autophosphorylation of Thr-187 is required; TAB1 and TAB2 both contribute to TAK1 phosphorylation but regulate it differentially; p38alpha/TAB1/TAB2-mediated feedback control suppresses TAK1 Thr-187 phosphorylation.\",\n      \"method\": \"Phospho-specific immunoblotting, alanine-substitution mutagenesis, RNAi, kinase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — site-specific mutagenesis + phospho-antibody + RNAi in single rigorous study\",\n      \"pmids\": [\"15590691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TAB1 expression in anergic CD4+ T cells activates p38alpha (MKK-independent) to suppress IL-2 production and promote IL-10 production, maintaining T cell anergy; inhibition of p38 or p38 dominant-negative rescued IL-2 and ERK activity in TAB1-expressing T hybridoma cells.\",\n      \"method\": \"Retroviral transduction, p38 inhibitor (SB203580), dominant-negative p38, cytokine ELISA, kinase assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function with multiple downstream readouts, single lab\",\n      \"pmids\": [\"15282297\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Crystal structure of a TAK1 chimeric protein revealed a novel binding pocket on the TAK1 kinase domain whose shape complements a unique alpha-helix in the TAK1-binding domain of TAB1, providing structural basis for the intimate hydrophobic interaction mediating TAK1 activation by TAB1.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure providing mechanistic basis; single lab but Tier 1 method\",\n      \"pmids\": [\"16289117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"AMPK promotes p38 MAPK activation in the ischemic heart by increasing recruitment of p38 to TAB1; TAB1 is physically associated with the alpha2 catalytic subunit of AMPK; p38 recruitment to TAB1/AMPK complexes requires AMPK activation and is reduced in AMPK-deficient hearts.\",\n      \"method\": \"AICAR treatment, transgenic kinase-dead AMPK mice, co-immunoprecipitation, ischemia model, glucose transport assay\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP in transgenic model + genetic loss-of-function with defined molecular and functional readouts\",\n      \"pmids\": [\"16179588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TAB1 binds p38 and sequesters it in the cytoplasm, preventing p38 nuclear localization; TAB1 disrupts p38 interaction with MKK3 and redirects p38 to the cytosol; consequently, TAB1 expression antagonizes MKK3-induced downstream p38 activity and attenuates IL-1beta-induced inflammatory gene induction in cardiomyocytes.\",\n      \"method\": \"Overexpression, subcellular fractionation, co-immunoprecipitation, inflammatory gene reporter assay, confocal imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — localization by imaging/fractionation tied to functional consequence, single lab with multiple methods\",\n      \"pmids\": [\"16407200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TAK1 is dispensable (in vivo, in TAK1-null MEFs) for NF-kappaB and AP-1 activation by TNFR1, IL-1R, TLR3, and TLR4, whereas TAB1- and TAB2-null MEFs show normal activation through those pathways; TAK1 mediates IKK activation downstream of RIP1-TRAF2 (TNF) and MyD88-IRAK1-TRAF6 (IL-1).\",\n      \"method\": \"Conditional gene knockout in mice and MEFs, NF-kappaB/AP-1 reporter assay, epistasis analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis in multiple knockout MEF lines with multiple pathway readouts; landmark paper replicated independently\",\n      \"pmids\": [\"16260493\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"DUSP14 (MKP6) directly interacts with TAB1 and dephosphorylates TAB1 at Ser438, leading to TAB1-TAK1 complex inactivation; DUSP14-deficient T cells show enhanced phosphorylation of the TAB1-TAK1 complex and downstream JNK and IKK, and the enhanced activation was attenuated by TAB1 shRNA knockdown.\",\n      \"method\": \"Co-immunoprecipitation, phosphatase assay, DUSP14-deficient mice, TAB1 shRNA knockdown\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct biochemical interaction with phosphatase assay, genetic KO, and RNAi rescue experiment\",\n      \"pmids\": [\"24403530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"cGMP-dependent protein kinase I (PKG I) inhibits TAB1-p38 MAPK signaling: cGMP-activated PKG I interacts with p38 MAPK (requiring the N-terminal leucine-isoleucine zipper of PKG I) and prevents TAB1 binding to p38, thereby inhibiting p38 autophosphorylation and cardiac myocyte apoptosis during ischemia/reperfusion.\",\n      \"method\": \"Co-immunoprecipitation in HEK293 cells, cardiac myocyte-restricted PKG I knockout mice, simulated I/R, point mutant analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP with point mutants defining N-terminal LIZ requirement + in vivo cardiac KO model with molecular readouts\",\n      \"pmids\": [\"16943189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Pro412 in the C-terminus of TAB1 is essential for its interaction with p38alpha; a cryptic D-domain-like docking site adjacent to Pro412 engages the hydrophobic docking groove of p38alpha; p38alpha residues Thr218 and Ile275 (not found in p38beta) are required for specific TAB1 binding and TAB1-induced autophosphorylation.\",\n      \"method\": \"Deletion and point mutagenesis, co-immunoprecipitation, chimeric p38alpha/p38beta analysis, kinase assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — structure-guided mutagenesis with kinase and binding assays, single rigorous study\",\n      \"pmids\": [\"16648477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TGF-beta3/TbetaR1 complex associates with adaptor TAB1 to activate both p38 MAPK and ERK signaling pathways, disrupting both the blood-testis barrier and Sertoli-germ cell adhesion; when TbetaRI preferentially associates with CD2AP instead of TAB1, only Sertoli-germ cell adhesion is perturbed, demonstrating differential signal routing by adaptor association.\",\n      \"method\": \"Co-immunoprecipitation, in vitro Sertoli cell TJ assay, in vivo TGF-beta3 administration, dominant-negative constructs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and functional barrier assay, single lab with in vitro and in vivo data\",\n      \"pmids\": [\"16617054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The BIR1 domain of XIAP directly interacts with TAB1 to induce NF-kappaB activation via TAK1; crystal structures of BIR1, TAB1, and the BIR1/TAB1 complex revealed a butterfly-shaped BIR1 dimer; structure-based mutagenesis and TAB1 knockdown confirmed BIR1/TAB1 interaction is crucial for XIAP-induced TAK1 and NF-kappaB activation; Smac (caspase-inhibition antagonist) also inhibits the XIAP/TAB1 interaction.\",\n      \"method\": \"X-ray crystallography, surface plasmon resonance, structure-based mutagenesis, TAB1 knockdown, NF-kappaB reporter assay\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure of complex plus mutagenesis and RNAi validation, multiple orthogonal methods\",\n      \"pmids\": [\"17560374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TAB1 is required for TAK1 catalytic activity: TAK1 activity is undetectable in Tab1-/- MEFs after IL-1 or TNF stimulation. TAB1 is also required for p38alpha-mediated phosphorylation of TAB3 (at Ser60 and Thr404) within the TAK1 complex, acting as a scaffold that recruits p38alpha to TAK1.\",\n      \"method\": \"Tab1-/- MEF kinase assay, mass spectrometry phosphosite mapping, genetic epistasis with p38alpha/beta MAPK inhibitors\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — kinase assay in null MEFs + MS phosphosite identification + multiple genetic backgrounds tested\",\n      \"pmids\": [\"18021073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TAB1 interacts with IKKbeta to form TAB1:IKKbeta complexes in breast cancer cells undergoing EMT, leading to stimulation of a TAK1:IKKbeta:p65 pathway and NF-kappaB activation; a truncated TAB1(411) mutant reduced TGF-beta-mediated NF-kappaB activation and tumor growth.\",\n      \"method\": \"Co-immunoprecipitation, truncation mutant expression, NF-kappaB reporter, tumor xenograft\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP defining novel TAB1:IKKbeta complex + functional truncation mutant + in vivo tumor model, single lab\",\n      \"pmids\": [\"18316610\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TAB1 mediates osmotic stress-induced TAK1 activation (but is dispensable for TNF- or IL-1-induced TAK1 activation in MEFs); the C-terminal 68 amino acids of TAB1 are sufficient for osmotic stress-induced TAK1 activation; cell shrinkage increases TAB1-TAK1 concentration, promoting oligomerization-dependent TAK1 activation.\",\n      \"method\": \"Tab1-/- MEFs, osmotic stress assay, TAB1 truncation mutants, kinase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic null MEFs with defined stimulus specificity and domain mapping, single lab with multiple methods\",\n      \"pmids\": [\"18829460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TAB4 (TIP) binds TAK1 directly, enhances TAK1 autophosphorylation, and stimulates phosphorylation of two sites in TAB1 as identified by mass spectrometry; TAB4 selectively promotes IKK phosphorylation and NF-kappaB signaling.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry phosphosite identification, in vitro kinase assay, NF-kappaB reporter\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS-defined phosphosites on TAB1 + kinase assay, single lab\",\n      \"pmids\": [\"18456659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TAK1-TAB1-TAB2 complex phosphorylates RCAN1 at Ser94 and Ser136, converting RCAN1 from an inhibitor to a facilitator of calcineurin-NFAT signaling; calcineurin in turn dephosphorylates and inhibits TAK1 and TAB1, forming a bidirectional regulatory loop; TAB2 bridges the TAK1-TAB1 and calcineurin-NFAT modules.\",\n      \"method\": \"In vitro kinase assay, co-immunoprecipitation, NFAT transcriptional reporter, cardiomyocyte hypertrophy assay, Rcan1/2- and Tab2-deficient MEFs\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro phosphorylation assay with defined sites + genetic null MEFs + multiple functional readouts\",\n      \"pmids\": [\"19136967\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TGF-beta1-induced TAK1 activation in mesangial cells requires TAB1-mediated autophosphorylation and does not require TbetaRI kinase activity; TAB1 does not interact with TGF-beta receptors but is indispensable for TGF-beta1-induced TAK1 activation.\",\n      \"method\": \"Kinase-dead TbetaRI mutant, co-immunoprecipitation, kinase assay, deletion mutant analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase assay with receptor mutants + Co-IP, single lab\",\n      \"pmids\": [\"19556242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TAB1 is O-GlcNAcylated on a single site, Ser395 (human), induced by IL-1 and osmotic stress; O-GlcNAcylation of TAB1 is required for full TAK1 activation upon IL-1/osmotic stress stimulation, and for downstream NF-kappaB activation and IL-6/TNFalpha production; the S395A O-GlcNAc-deficient TAB1 mutant fails to fully rescue signaling in Tab1-/- MEFs.\",\n      \"method\": \"O-GlcNAc-specific antibody, site-directed mutagenesis (S395A), Tab1-/- MEF reconstitution, kinase assay, ELISA\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — PTM site identified by MS + site-specific antibody + genetic reconstitution in null MEFs with multiple downstream readouts\",\n      \"pmids\": [\"22307082\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"p38alpha autophosphorylation initiated by TAB1 occurs in cis by direct interaction with TAB1 residues 371-416; crystal structures of the p38alpha-TAB1 complex revealed a bipartite docking site on the p38alpha C-terminal lobe; TAB1 binding stabilizes active p38alpha and induces helical extension of the Thr-Gly-Tyr motif in the activation segment allowing autophosphorylation in cis; a cell-permeable TAT-TAB1(371-416) peptide rapidly activates p38 and perturbs cardiac function.\",\n      \"method\": \"X-ray crystallography, chemical-genetic approaches, coexpression in mammalian/bacterial/cell-free systems, FRET, isolated cardiac myocytes and perfused mouse hearts\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure + chemical-genetic in cis mechanism + multiple expression systems + in vitro and in vivo cardiac validation\",\n      \"pmids\": [\"24037507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"USP18 deubiquitinates the TAK1-TAB1 complex, thereby restricting TAK1 activity; USP18-deficient T cells exhibit hyperactivation of NF-kappaB and NFAT and elevated IL-2, and USP18 physically associates with the TAK1-TAB1 complex.\",\n      \"method\": \"Co-immunoprecipitation, USP18-deficient mouse T cells, NF-kappaB/NFAT reporter assay, ubiquitination assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP + genetic KO with functional readouts, single lab\",\n      \"pmids\": [\"23825189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TAB1 associates with MDM2 and inhibits its E3 ligase activity toward p53 and MDMX; p38alpha activated by TAB1 phosphorylates p53 N-terminal sites leading to selective induction of NOXA; TAB1-dependent MDMX stabilization is required for cell death after cisplatin treatment; TAB1 depletion inhibits MDM2 siRNA-mediated p53 accumulation.\",\n      \"method\": \"Co-immunoprecipitation, E3 ligase assay, siRNA knockdown, p53 target gene analysis, cell viability assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP + E3 ligase assay + RNAi phenotype, single lab with multiple methods\",\n      \"pmids\": [\"23934659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TAB1 is identified as the direct binding target of triptolide (TP) in macrophages; TP inhibits TAK1 kinase activity by interfering with TAK1-TAB1 complex formation; the amino acid sequence between positions 373 and 502 of TAB1 is required for TP interaction.\",\n      \"method\": \"Pull-down assay, in vitro kinase assay, deletion mutagenesis, MAPK pathway inhibition assay\",\n      \"journal\": \"Chemistry & biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pull-down + kinase assay with domain mapping, single lab\",\n      \"pmids\": [\"24462677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"EV71 3C protease cleaves TAB1 at Q414-G415 and Q451-S452 (as well as TAK1 and TAB2/TAB3), disrupting the TAK1/TAB complex and inhibiting NF-kappaB activation; 3C active-site mutants (H40D or C147S) abolish cleavage activity.\",\n      \"method\": \"In vitro cleavage assay, active-site mutagenesis, NF-kappaB luciferase reporter, overexpression in mammalian cells\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro cleavage with site mutagenesis + functional NF-κB readout, single lab\",\n      \"pmids\": [\"24942571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In senescent human T cells, AMPK triggers recruitment of p38 to the scaffold protein TAB1, causing autophosphorylation of p38 via an intrasensory (non-canonical) pathway; this AMPK-TAB1-p38 pathway inhibits telomerase activity, T cell proliferation, and TCR signalosome components; blockade of AMPK-TAB1-dependent p38 activation reverses the proliferative defect.\",\n      \"method\": \"Co-immunoprecipitation, AMPK inhibition, p38 inhibition, T cell functional assays (telomerase, proliferation)\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP + pharmacological inhibition with multiple functional readouts in primary human T cells\",\n      \"pmids\": [\"25151490\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MEKK1 PHD motif mediates Lys63-linked polyubiquitination of TAB1 (using conjugating enzyme UBE2N), regulating TAK1 and MAPK activation by TGF-beta and EGF; protein microarray identified TAB1 as a PHD substrate; Map3k1(mPHD) ES cells exhibit defective non-canonical ubiquitination of TAB1.\",\n      \"method\": \"Protein microarray substrate identification, in vitro ubiquitination assay, Map3k1 PHD knock-in mouse ES cells, MAPK activation assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro ubiquitination assay + genetic knock-in model identifying TAB1 as substrate, single lab\",\n      \"pmids\": [\"25260751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"E3 ubiquitin ligase Itch binds TAB1 through a conserved PPXY motif and ubiquitylates it, inhibiting p38alpha activation; knockdown of TAB1 attenuated prolonged p38alpha phosphorylation in Itch-/- cells; reconstitution with wild-type but not ligase-dead Itch-C830A inhibited p38alpha phosphorylation; a cell-permeable peptide blocking TAB1-p38alpha interaction attenuated skin inflammation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, shRNA knockdown, Itch-/- mouse model, reconstitution assay\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct binding + ubiquitination assay + genetic rescue + in vivo mouse model with multiple orthogonal methods\",\n      \"pmids\": [\"25714464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"E3 ubiquitin ligase RNF114 mediates ubiquitination and proteasomal degradation of TAB1 during maternal-to-zygotic transition; TAB1 degradation activates the NF-kappaB pathway and is required for MZT; five substrates of RNF114 were identified by protein microarray and validated by in vitro ubiquitination.\",\n      \"method\": \"Protein microarray, in vitro ubiquitination assay, Rnf114 knockdown in mouse oocytes, NF-kappaB activity assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro ubiquitination assay + functional embryo knockdown + NF-kappaB readout, single lab\",\n      \"pmids\": [\"28073917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of active pp38alpha-TAB1(1-438) complex defined 4 residues on TAB1 required for docking onto p38alpha; global TAB1 knock-in (KI) mice with these substitutions are viable; KI mice show significantly reduced infarction volume after in vivo ischemia and disabled TAB1 transphosphorylation, with only mild attenuation of myocardial p38alpha activation.\",\n      \"method\": \"X-ray crystallography, global knock-in mouse model, in vivo regional ischemia, infarction measurement, fragment screening\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure + knock-in mouse with defined mechanistic phenotype + in vivo ischemia model\",\n      \"pmids\": [\"30135318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"p38alpha autoactivation by TAB1 is critically dependent on Thr185 of p38alpha: replacing Thr185 with Gly (T185G) prevents an intramolecular hydrogen bond with Asp150, disrupting TAB1-induced conformational change in the activation segment without affecting TAB1 binding, upstream MAP2K activation, or downstream substrate phosphorylation; T185G p38alpha-expressing cardiac cells are resistant to ischemia injury.\",\n      \"method\": \"Crystal structure-guided mutagenesis, in vitro kinase assay, cardiac myocyte ischemia model, in vivo mouse assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structure-guided mutagenesis + in vitro and in vivo validation with multiple mechanistic controls\",\n      \"pmids\": [\"29229647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Alpha-synuclein disrupts the anti-inflammatory effect of dopamine D2 receptor (Drd2) in astrocytes by inhibiting the association of beta-arrestin2 with TAB1, thereby promoting TAK1-TAB1 interaction and downstream neuroinflammation.\",\n      \"method\": \"Co-immunoprecipitation, Western blotting, beta-arrestin2 overexpression, primary astrocyte assay, A53T transgenic mice\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP defining competitive interaction + genetic/pharmacological manipulation, single lab\",\n      \"pmids\": [\"30200997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Multiple GPCR agonists (thrombin, histamine, prostaglandin E2, ADP) activate p38 MAPK via a non-canonical TAB1-TAB2 and/or TAB1-TAB3-dependent autophosphorylation pathway in endothelial cells, with MKK3/6 activation virtually undetectable; cell-type-specific dependence on TAB1-TAB2 versus TAB1-TAB3 was demonstrated by siRNA knockdown.\",\n      \"method\": \"siRNA knockdown (TAB1, TAB2, TAB3), p38 autophosphorylation assay, MKK3/6 phosphorylation assay, IL-6 ELISA, multiple endothelial cell types\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi knockdown in multiple cell types with defined molecular phenotype, single lab\",\n      \"pmids\": [\"30760523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SARS-CoV-2 NSP5 (3CLpro) directly cleaves TAB1 in vitro; cleavage is specific and selective, providing a potential mechanism for enhanced cytokine production in COVID-19.\",\n      \"method\": \"In vitro cleavage assay with recombinant proteases\",\n      \"journal\": \"Emerging microbes & infections\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro protease cleavage assay, single study, abstract does not detail full mutagenesis\",\n      \"pmids\": [\"33372854\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM26 catalyzes K11-linked polyubiquitination of TAB1 at Lys294, Lys319, and Lys335, enhancing TAK1 activation and downstream NF-kappaB and MAPK signaling; Trim26-knockout mice show reduced TAK1 activation and proinflammatory cytokine induction after LPS/TNF/IL-1beta stimulation and are protected from LPS-induced septic shock.\",\n      \"method\": \"In vitro ubiquitination assay, site-directed mutagenesis, Trim26-KO and Trim26-transgenic mice, kinase assay, septic shock model, DSS colitis model\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro ubiquitination + site mutagenesis + genetic KO and transgenic mice with in vivo disease models\",\n      \"pmids\": [\"34017102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GFAT1 interacts with TAB1 in a TAB1-Ser438 phosphorylation-dependent manner upon glucose deprivation; GFAT1 binding facilitates TTLL5-GFAT1-TAB1 complex formation; GFAT1 metabolic activity provides glutamate for TTLL5-mediated TAB1 glutamylation; glutamylated TAB1 recruits p38alpha MAPK to drive p38 activation and promote autophagy for tumor cell survival.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, site-directed mutagenesis (S438A), TTLL5 glutamylation assay, p38 activation assay, autophagy assay\",\n      \"journal\": \"Cell discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP + MS-defined glutamylation site + TTLL5 enzymatic assay + functional readout, single lab\",\n      \"pmids\": [\"35945223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"RNF207 promotes K63-linked ubiquitination of TAB1, triggering TAK1 autophosphorylation and activation of downstream p38 and JNK1/2, exacerbating pathological cardiac hypertrophy; TAB1 knockdown attenuated RNF207-overexpression-induced cardiomyocyte hypertrophy.\",\n      \"method\": \"Co-immunoprecipitation, in vitro ubiquitination assay, TAC mouse model, TAB1 knockdown in cardiomyocytes\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay + in vivo TAC model + TAB1 KD rescue, single lab\",\n      \"pmids\": [\"35352799\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TAB1 (MAP3K7IP1) is a scaffold/adaptor protein that constitutively binds TAK1 through a C-terminal alpha-helical domain (containing the PYVDXA/TXF motif and critical Phe484), inducing TAK1 autophosphorylation on Thr187 and thereby activating TAK1 kinase activity toward IKK and MKK3/6 in cytokine (IL-1, TNF), TGF-beta, and osmotic stress signaling; TAB1 also directly binds p38alpha at its hydrophobic docking groove (requiring p38alpha Thr218 and Ile275), inducing p38alpha autophosphorylation in cis (dependent on p38alpha Thr185) to activate p38 independently of MKKs in contexts such as myocardial ischemia, T-cell senescence, and GPCR signaling; TAB1 activity is regulated by multiple post-translational modifications including O-GlcNAcylation (Ser395, required for full TAK1 activation), K11-linked ubiquitination by TRIM26 (activating), K63-linked ubiquitination by RNF207 (activating in cardiac hypertrophy), ubiquitination and degradation by RNF114 (during MZT), ubiquitination by the MEKK1 PHD, dephosphorylation by DUSP14 at Ser438 (inactivating), and direct interaction with XIAP BIR1 domain (linking BMP receptor signaling to TAK1-NF-kappaB activation); viral proteases (EV71 3C, SARS-CoV-2 NSP5) cleave TAB1 to disrupt inflammatory signaling.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TAB1 (MAP3K7IP1) is a scaffold/adaptor protein that activates stress- and cytokine-responsive MAP kinase signaling by directly engaging and allosterically activating two distinct kinases [#0, #5]. Through a C-terminal alpha-helical domain bearing a conserved PYVDXA/TXF motif and the critical Phe484, TAB1 binds the TAK1 kinase domain via a complementary hydrophobic pocket and induces TAK1 autophosphorylation on activation-loop threonines (Thr187), thereby driving TAK1 catalytic activity toward downstream IKK/NF-kappaB and MAPK modules [#1, #2, #9, #11]; TAB1 is essential in vivo, as Tab1-null embryos die with cardiovascular and lung defects and Tab1-null fibroblasts show abolished TAK1 activity after IL-1/TNF and reduced TGF-beta responsiveness [#6, #20], with TAB1 selectively required for osmotic stress- and TGF-beta-induced TAK1 activation rather than all cytokine inputs [#22, #25]. Independently of upstream MAP2Ks, TAB1 binds p38alpha at a bipartite docking site on its C-terminal lobe (engaging p38alpha residues Thr218/Ile275 via a cryptic D-domain-like site near Pro412) and induces p38alpha autophosphorylation in cis, a conformational mechanism that stabilizes the active kinase and depends on p38alpha Thr185 [#5, #17, #27, #37]. This non-canonical TAB1-p38alpha axis operates in myocardial ischemia, where AMPK promotes p38 recruitment to TAB1 to drive ischemic injury [#8, #12, #36], in CD4+ T-cell anergy and senescence [#10, #32], and in GPCR signaling in endothelium [#39]. TAB1 activity is tuned by an extensive PTM network: activating O-GlcNAcylation at Ser395 [#26], activating TRIM26-mediated K11-linked and RNF207-mediated K63-linked ubiquitination [#41, #43], inactivating DUSP14-mediated dephosphorylation at Ser438 [#15], MEKK1-PHD- and Itch-mediated ubiquitination [#33, #34], and RNF114-driven degradation during the maternal-to-zygotic transition [#35]. TAB1 further links to NF-kappaB activation through direct interaction with the XIAP BIR1 domain and with IKKbeta [#19, #21], and viral proteases (EV71 3C, SARS-CoV-2 NSP5) cleave TAB1 to disrupt inflammatory signaling [#31, #40].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Established TAB1 as a physical and functional activator of the TAK1 MAP3K, answering how TAK1 is engaged in TGF-beta-regulated transcription.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal co-IP, kinase assay and promoter reporter in mammalian cells\",\n      \"pmids\": [\"8638164\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the binding interface or the molecular mechanism of activation\", \"Did not establish in vivo requirement\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the structural basis of TAK1 engagement, mapping activation to a conserved C-terminal PYVDXA/TXF motif forming a unique alpha-helix with Phe484 as the critical contact.\",\n      \"evidence\": \"Deletion/alanine mutagenesis, NMR, co-IP and kinase assay; conservation validated in C. elegans\",\n      \"pmids\": [\"10838074\", \"11323434\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution view of the TAK1 pocket not yet available\", \"Did not address how stimulus specificity is achieved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Revealed a second, MAP2K-independent function: TAB1 directly binds p38alpha and induces its autophosphorylation, defining a non-canonical p38 activation route.\",\n      \"evidence\": \"Co-IP, in vitro kinase assay, dominant-negative/overexpression, TRAF6-TAB1-p38alpha ternary complex detection; splice-variant TAB1beta analysis\",\n      \"pmids\": [\"11847341\", \"12429732\", \"12372426\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of cis-autophosphorylation not yet resolved\", \"p38alpha docking residues not yet mapped\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrated the essential in vivo role of TAB1 for TAK1 activation and embryonic development.\",\n      \"evidence\": \"Tab1 knockout mice, embryo histology, kinase assay in null MEFs, TGF-beta signaling assay\",\n      \"pmids\": [\"12464436\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate TAK1-dependent from p38-dependent developmental functions\", \"Cell-type-specific requirements not addressed\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved the activating phosphorylation event (TAK1 Thr187 intermolecular autophosphorylation) and revealed feedback control by a p38alpha/TAB1/TAB2 loop.\",\n      \"evidence\": \"Phospho-specific immunoblotting, alanine mutagenesis, RNAi, kinase assay\",\n      \"pmids\": [\"15590691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Differential contributions of TAB1 vs TAB2 to TAK1 phosphorylation not fully separated\", \"Feedback kinetics in physiological settings unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Provided the atomic structural basis for TAK1 activation, showing a TAK1-domain pocket complementary to the TAB1 alpha-helix.\",\n      \"evidence\": \"X-ray crystallography of a TAK1 chimeric protein\",\n      \"pmids\": [\"16289117\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Used a chimeric construct rather than the native complex\", \"Did not capture full-length regulatory regions\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Linked the non-canonical TAB1-p38 axis to disease physiology, showing it drives ischemic p38 activation in myocardium and is potentiated by AMPK recruitment.\",\n      \"evidence\": \"mkk3-/- perfused hearts, AICAR/kinase-dead AMPK transgenic mice, co-IP, SB203580 pharmacology\",\n      \"pmids\": [\"12829618\", \"16179588\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How AMPK physically promotes p38-TAB1 assembly not structurally defined\", \"Whether AMPK directly modifies TAB1 unresolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mapped the p38alpha docking determinants (TAB1 Pro412 cryptic D-site; p38alpha Thr218/Ile275) explaining isoform-specific TAB1-p38alpha engagement and revealed negative regulators (PKG I, cytoplasmic sequestration).\",\n      \"evidence\": \"Point/chimeric mutagenesis, co-IP, kinase assay, subcellular fractionation, cardiac PKG I knockout\",\n      \"pmids\": [\"16648477\", \"16943189\", \"16407200\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conformational mechanism of induced autophosphorylation still unresolved at this stage\", \"Physiological balance between sequestration and activation unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined a structural NF-kappaB-activating input, showing the XIAP BIR1 domain dimer directly binds TAB1 to drive TAK1-dependent NF-kappaB activation.\",\n      \"evidence\": \"Crystallography of BIR1/TAB1 complex, SPR, structure-based mutagenesis, TAB1 knockdown, NF-kappaB reporter\",\n      \"pmids\": [\"17560374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo significance of XIAP-TAB1 axis not established\", \"How Smac antagonism is regulated physiologically unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Established TAB1 as an obligate scaffold for TAK1 catalysis and for recruiting p38alpha into the TAK1 complex, and defined stimulus-specific requirement (osmotic stress vs cytokines).\",\n      \"evidence\": \"Tab1-/- MEF kinase assays, MS phosphosite mapping of TAB3, osmotic stress and truncation analyses; IKKbeta complex and TAB4 phosphosite studies\",\n      \"pmids\": [\"18021073\", \"18829460\", \"18316610\", \"18456659\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation with reports that TAK1/TAB1 are dispensable for some cytokine pathways incomplete\", \"Quantitative stoichiometry of the scaffold complex unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Embedded the TAK1-TAB1 complex in a calcineurin-NFAT regulatory loop via RCAN1 phosphorylation, and showed TGF-beta activation of TAK1 occurs without receptor kinase activity.\",\n      \"evidence\": \"In vitro kinase assay with defined RCAN1 sites, co-IP, NFAT reporter, Tab2/Rcan-null MEFs; kinase-dead TbetaRI analysis\",\n      \"pmids\": [\"19136967\", \"19556242\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TGF-beta signal reaches TAB1 without receptor binding unresolved\", \"Tissue specificity of the calcineurin crosstalk unclear\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified O-GlcNAcylation of TAB1 at Ser395 as a metabolic PTM required for full TAK1 activation and downstream cytokine output.\",\n      \"evidence\": \"O-GlcNAc antibody, S395A mutagenesis, Tab1-/- MEF reconstitution, kinase assay, ELISA\",\n      \"pmids\": [\"22307082\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The O-GlcNAc transferase responsible not identified here\", \"Structural effect of Ser395 modification on TAK1 binding unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Solved the cis-autophosphorylation mechanism: TAB1(371-416) docks a bipartite site on p38alpha, stabilizing active conformation and enabling intramolecular activation-loop phosphorylation.\",\n      \"evidence\": \"Crystallography of p38alpha-TAB1 complex, chemical-genetics, FRET, cardiac myocyte/perfused heart with TAT-TAB1 peptide; USP18 and MDM2/p53 regulatory studies\",\n      \"pmids\": [\"24037507\", \"23825189\", \"23934659\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How docking is dynamically regulated by upstream stimuli unclear\", \"Generality of the MDM2/p53 link across tissues unestablished\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended the AMPK-TAB1-p38 axis to T-cell senescence and expanded the PTM regulatory layer (MEKK1-PHD K63 ubiquitination); identified pharmacological/viral disruption of TAB1.\",\n      \"evidence\": \"Co-IP and inhibitor studies in primary human T cells, protein microarray/in vitro ubiquitination, triptolide pull-down, EV71 3C cleavage assays\",\n      \"pmids\": [\"25151490\", \"25260751\", \"24462677\", \"24942571\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical AMPK-TAB1-p38 architecture not solved\", \"In vivo relevance of MEKK1-PHD ubiquitination of TAB1 limited\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified Itch as a ubiquitin ligase binding TAB1 via a PPXY motif to restrain p38alpha activation, with therapeutic peptide disruption of TAB1-p38 reducing inflammation.\",\n      \"evidence\": \"Co-IP, ubiquitination assay, shRNA, Itch-/- mice, reconstitution with ligase-dead Itch, cell-permeable peptide\",\n      \"pmids\": [\"25714464\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitination linkage type and target lysines on TAB1 not fully defined\", \"Crosstalk with activating ubiquitin ligases unresolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided definitive structural and genetic proof that TAB1-driven p38alpha cis-autophosphorylation mediates ischemic injury, via docking-site and Thr185-dependent conformational mechanisms.\",\n      \"evidence\": \"Crystallography of pp38alpha-TAB1(1-438), TAB1 and p38alpha T185G knock-in mice, in vivo regional ischemia\",\n      \"pmids\": [\"30135318\", \"29229647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Residual MKK-dependent p38 activation complicates clean separation in vivo\", \"Therapeutic targeting feasibility not yet established\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established activating K11-linked ubiquitination of TAB1 by TRIM26 as a driver of inflammatory TAK1 signaling with in vivo disease relevance.\",\n      \"evidence\": \"In vitro ubiquitination, site mutagenesis (K294/319/335), Trim26-KO and transgenic mice, septic shock and DSS colitis models\",\n      \"pmids\": [\"34017102\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How K11 chains structurally promote TAK1 activation unclear\", \"Interplay with other TAB1 ubiquitin ligases not mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Linked metabolic and ubiquitin signals to cardiac and tumor pathology through TAB1 (RNF207 K63 ubiquitination; GFAT1/TTLL5 glutamylation recruiting p38alpha for autophagy).\",\n      \"evidence\": \"Co-IP, in vitro ubiquitination, TAC mouse model, S438-dependent GFAT1 binding, TTLL5 glutamylation and autophagy assays\",\n      \"pmids\": [\"35352799\", \"35945223\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab findings without independent replication\", \"Structural basis of glutamylation-driven p38alpha recruitment unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the diverse activating and inhibitory PTMs on TAB1 are integrated to set context-specific TAK1 versus p38alpha output remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model reconciling competing ubiquitin, O-GlcNAc, glutamylation and phosphorylation marks\", \"Quantitative determinants of TAB1 partitioning between TAK1 and p38alpha complexes unknown\", \"Stoichiometry and dynamics of native TAB1 complexes in vivo undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 5, 9, 20, 27]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 5, 20, 19]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 9, 11, 27, 26]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 14, 15, 32, 41]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 5, 8, 39]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [22, 8, 26]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 18, 35]}\n    ],\n    \"complexes\": [\"TAK1-TAB1-TAB2 complex\", \"p38alpha-TAB1 complex\"],\n    \"partners\": [\"MAP3K7\", \"MAPK14\", \"XIAP\", \"IKBKB\", \"DUSP14\", \"TRIM26\", \"PRKAA2\", \"ITCH\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}