{"gene":"TAB3","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2004,"finding":"TAB2 and TAB3 bind preferentially to lysine 63-linked polyubiquitin chains through a conserved zinc finger (ZnF) domain. Mutations of the ZnF domain abolish polyubiquitin binding and the ability to activate TAK1 and IKK. Replacement of the ZnF domain with a heterologous ubiquitin-binding domain restored TAK1 and IKK activation, demonstrating that polyubiquitin binding is essential for signaling.","method":"In vitro binding assays, ZnF domain mutagenesis, heterologous domain replacement, IKK activation assays","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution, active-site mutagenesis, and domain-swap rescue in a single rigorous study","pmids":["15327770"],"is_preprint":false},{"year":2003,"finding":"TAB3 physically associates with TAK1 and activates NF-κB. Endogenous TAB3 interacts with TRAF6 in an IL-1-dependent manner and with TRAF2 in a TNF-dependent manner. IL-1 signaling leads to TRAF6-mediated ubiquitination of TAB3. siRNA knockdown of both TAB2 and TAB3 inhibits IL-1- and TNF-induced TAK1 and NF-κB activation, indicating redundant roles.","method":"Co-immunoprecipitation, siRNA knockdown, NF-κB reporter assays, ubiquitination assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, siRNA functional rescue, multiple orthogonal methods, replicated across labs","pmids":["14633987"],"is_preprint":false},{"year":2004,"finding":"TAB3 forms two distinct TAK1 complexes in cells: one containing TAK1-TAB1-TAB2 and another containing TAK1-TAB1-TAB3. Both complexes are activated by TNF-α, IL-1, or LPS. TAB3 electrophoretic mobility decreases upon stimulation and is reversed by protein phosphatase-1, indicating phosphorylation. TAB3 phosphorylation is prevented by the p38 MAPK inhibitor SB203580, indicating TAB3 is phosphorylated via the SAPK2a/p38α pathway.","method":"Co-immunoprecipitation, kinase assays, phosphatase treatment, SB203580 inhibitor experiments, p38α-knockout MEFs","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, knockout MEFs, pharmacological inhibition, multiple orthogonal methods","pmids":["14670075"],"is_preprint":false},{"year":2006,"finding":"The TAB2/TAB3-binding domain on TAK1 maps to a non-contiguous region within the last C-terminal 100 residues (residues 479–553 necessary and sufficient). Residues 574–693 of TAB2 mediate interaction with TAK1. A GFP-TAK1-C100 fusion protein abolished endogenous TAB2/TAB3 interaction with TAK1, blocked TAK1 phosphorylation, and prevented IKK and MAPK activation by IL-1, TNF, and RANKL, as well as RANKL-induced NFATc1 nuclear accumulation and osteoclast differentiation.","method":"Deletion mapping, Co-immunoprecipitation, dominant-negative competition assay, kinase assays, osteoclast differentiation assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain mapping with deletion constructs, dominant-negative competition, multiple downstream readouts","pmids":["17158449"],"is_preprint":false},{"year":2009,"finding":"Crystal structures of TAB2 and TAB3 NZF domains in complex with Lys63-linked diubiquitin resolved at 1.18 Å and 1.40 Å, respectively. Both NZF domains bind the distal ubiquitin via a conserved Thr-Phe dipeptide. A surface specific to TAB2/TAB3 binds the proximal ubiquitin via the Ile44-centered hydrophobic patch. Mutagenesis confirmed both distal and proximal binding sites are required for Lys63-linked diubiquitin binding.","method":"X-ray crystallography, site-directed mutagenesis, ubiquitin binding assays","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures with functional mutagenesis validation, high-resolution data","pmids":["19927120"],"is_preprint":false},{"year":2007,"finding":"TGF-β-induced Smad7 binds directly to TAB2 and TAB3, blocking recruitment of TAK1 to TRAF2. Formation of Smad7-TAB2 and Smad7-TAB3 complexes suppresses TNF-induced TRAF2-TAB2/TAB3-TAK1 complex assembly. In mouse skin expressing a Smad7 transgene, endogenous TRAF2-TAK1-TAB3 complexes were disrupted and NF-κB nuclear translocation was suppressed.","method":"Co-immunoprecipitation, transgenic mouse model, NF-κB nuclear translocation assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, in vivo transgenic validation, mechanistic pathway placement","pmids":["17384642"],"is_preprint":false},{"year":2008,"finding":"TRIM30α, induced by TLR agonists, interacts with the TAB2-TAB3-TAK1 complex and promotes degradation of TAB2 and TAB3, thereby inhibiting NF-κB activation. This constitutes a negative feedback mechanism of TLR signaling.","method":"Co-immunoprecipitation, overexpression and transgenic mouse studies, siRNA knockdown, NF-κB activation assays","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, transgenic mouse, siRNA knockdown, in vivo endotoxic shock model","pmids":["18345001"],"is_preprint":false},{"year":2008,"finding":"Three IL-1-stimulated phosphorylation sites on TAB3 were identified: Ser60, Thr404, and Ser506. Ser60 and Thr404 are phosphorylated directly by p38α MAPK, while Ser506 is phosphorylated by MAPKAP-K2/K3 (downstream of p38α). TAB1 is required to recruit p38α to the TAK1 complex for TAB3 phosphorylation at Ser60 and Thr404, and to prevent dephosphorylation of TAB3 at Ser506.","method":"Mass spectrometry-based phosphosite mapping, TAB1-knockout MEFs, kinase assays with specific inhibitors","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — phosphosite mapping by MS, genetic knockout validation, kinase hierarchy established","pmids":["18021073"],"is_preprint":false},{"year":2011,"finding":"TAB2 and TAB3 constitutively interact with the autophagy mediator Beclin 1 via their coiled-coil domains (CCDs), inhibiting autophagy. Upon autophagy induction, TAB2 and TAB3 dissociate from Beclin 1 and bind TAK1. Overexpression of TAB2/TAB3 suppresses autophagy, while their depletion triggers autophagy. Expression of the C-terminal domain of TAB3 or the CCD of Beclin 1 disrupts this interaction and stimulates autophagy through a pathway requiring endogenous Beclin 1, TAK1, and IKK.","method":"Co-immunoprecipitation, domain mapping (CCD), overexpression and siRNA depletion, autophagy readouts (electron microscopy, GFP-LC3 puncta)","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, domain-specific constructs, genetic depletion with defined phenotype, multiple orthogonal methods","pmids":["22081109"],"is_preprint":false},{"year":2013,"finding":"TAB2 and TAB3 are essential for B cell activation and B-1/marginal zone B cell development. In B cells lacking both TAB2 and TAB3, MAPK (especially ERK) activation is abolished in response to TLR and CD40 stimulation, whereas NF-κB activation is unaffected. Surprisingly, TAB2/TAB3-mediated MAPK activation in B cells occurs via a pathway independent of TAK1.","method":"Conditional double knockout mouse model, B cell stimulation assays, MAPK and NF-κB activation assays, B cell development analysis","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic double knockout, multiple signaling readouts, unexpected TAK1-independent pathway established","pmids":["23509369"],"is_preprint":false},{"year":2014,"finding":"Enterovirus 71 3C protease cleaves TAB3 at two sites (Q173-G174 and Q343-G344), requiring 3C protease activity. H40D or C147S substitutions in 3C active sites abolish cleavage. EV71 3C interacts with TAB2 and TAK1, and cleavage of the TAK1/TAB1/TAB2/TAB3 complex inhibits NF-κB activation and cytokine production.","method":"Protease activity assays, active-site mutagenesis, Co-immunoprecipitation, NF-κB reporter assays, cleavage site mapping","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — active-site mutagenesis, precise cleavage-site mapping, Co-IP, functional NF-κB assays","pmids":["24942571"],"is_preprint":false},{"year":2017,"finding":"IL-1β can activate the TAB1-TAK1 heterodimer in TAB2/TAB3 double knockout cells, but signaling is transient. TAB2/TAB3 are required for sustained TAK1 activation and for JNK1/2 and p38γ activation. Re-expression of TAB1 or TAB2 (but not an ubiquitin binding-defective mutant of TAB2) restores IL-1β signaling in TAB1/2/3 triple KO cells, establishing that K63-Ub chain binding by TAB2/TAB3 is required for one mode of TAK1 activation.","method":"TAB2/TAB3 double KO and TAB1/2/3 triple KO cell lines, re-expression rescue experiments, kinase assays, ubiquitin-binding mutant TAB2","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic KO lines, rescue with binding-defective mutant, multiple kinase pathway readouts","pmids":["28507161"],"is_preprint":false},{"year":2016,"finding":"TAB3 is O-GlcNAcylated at Ser408 by OGT in triple negative breast cancer cells. This O-GlcNAcylation at Ser408 is required for Thr404 phosphorylation of TAB3, TAK1 activation, and downstream NF-κB activation. O-GlcNAcylation of TAB3 is induced by p38 MAPK and in turn enhances TAK1-mediated p38 MAPK activation, forming a positive feedback loop.","method":"O-GlcNAc site mapping (Ser408), site-directed mutagenesis, OGT co-expression, kinase activation assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — PTM site identified with mutagenesis, functional kinase assays, single lab","pmids":["27009840"],"is_preprint":false},{"year":2019,"finding":"Multiple GPCR agonists (thrombin, histamine, PGE2, ADP) activate p38 MAPK via a non-canonical TAB1-TAB3-dependent pathway in primary human endothelial cells (HUVECs), bypassing canonical MKK3/MKK6 upstream kinases. TAB3 expression is confirmed in endothelial cells, and thrombin-induced p38 activation in HDMECs specifically depends on TAB1-TAB3 (not TAB1-TAB2). IL-6 production required both TAB1-TAB2 and TAB1-TAB3.","method":"siRNA knockdown, p38 and MKK3/6 phosphorylation assays, IL-6 ELISA, multiple endothelial cell types","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA knockdown with specific functional readouts, multiple cell types, single lab","pmids":["30760523"],"is_preprint":false},{"year":2020,"finding":"USP15 stabilizes TAB3 by inhibiting NBR1-mediated selective autophagic degradation of TAB3, independent of USP15's deubiquitinating activity. This TAB3 stabilization potentiates NF-κB activation downstream of TNFα and IL-1β.","method":"Co-immunoprecipitation, ubiquitination assays, lysosome inhibitor experiments, siRNA knockdown, NF-κB reporter assays","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, autophagic degradation assays, deubiquitinase-dead mutant, single lab","pmids":["31903660"],"is_preprint":false},{"year":2022,"finding":"METTL3 promotes m6A modification of TAB3 mRNA at its stop codon region. IGF2BP2 reads this m6A modification and stabilizes TAB3 mRNA. METTL3 knockdown reduces TAB3 protein levels and attenuates renal inflammation; METTL3 overexpression increases TAB3 stability and promotes inflammation. This mechanism was validated in vitro and in conditional METTL3 knockout mouse models.","method":"m6A-RIP sequencing, RNA-IP (IGF2BP2 pulldown), METTL3 conditional knockout mice, siRNA knockdown and overexpression","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — m6A-RIP-seq, RNA-IP, conditional KO mice, multiple orthogonal methods across in vitro and in vivo models","pmids":["35417191"],"is_preprint":false},{"year":2016,"finding":"TAB2 and TAB3 connect signaling molecules to activate IKK in B-cell receptor (BCR) signaling by linking TAK1 to CARMA1. Loss of TAB2 and TAB3 abolished BCR-induced IKK activation and TAK1 association with CARMA1. Deletion of TAB3 domains (ubiquitin-conjugation-to-ER degradation domain, coiled-coil domain, and zinc finger domain) each blocked IKK activation and CARMA1 association.","method":"TAB2/TAB3-deficient DT40 B cell lines, domain deletion mutants, Co-immunoprecipitation, IKK activation assays","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic deletion with domain mutants, Co-IP, single lab","pmids":["27497262"],"is_preprint":false},{"year":2020,"finding":"TAB3 promotes STAT3 phosphorylation through formation of a TAB3-TAK1-STAT3 complex, leading to upregulation of PIM1 expression and colorectal cancer proliferation. TAB3 knockdown decreased STAT3 phosphorylation and PIM1 expression; PIM1 overexpression rescued proliferation defects caused by TAB3 knockdown.","method":"Co-immunoprecipitation, siRNA knockdown, rescue overexpression experiments, xenograft tumor assays, immunoblotting","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for complex, rescue experiments, in vivo xenograft, single lab","pmids":["32229191"],"is_preprint":false},{"year":2024,"finding":"TAB2 and TAB3 are redundantly required in macrophages for TLR-induced NF-κB and MAPK activation and pro-inflammatory cytokine/chemokine production. Double deficiency of TAB2 and TAB3 severely impairs IκBζ expression at mRNA and protein levels, thereby impairing IL-6 production in response to LPS or Pam3CSK4.","method":"TAB2/TAB3 double-deficient bone marrow-derived macrophages, cytokine ELISA, NF-κB and MAPK phosphorylation assays, IκBζ expression analysis","journal":"International immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic double KO in primary macrophages, multiple signaling and functional readouts, improved mouse model","pmids":["38567483"],"is_preprint":false},{"year":2002,"finding":"TAB3 was identified in Xenopus laevis as a novel TAK1-binding protein with a role in regulating TAK1 activity during neural induction, with a proposed model of BMP inhibition partly through TAK1 regulation.","method":"Xenopus cDNA microarray, gain-of-function studies in ectodermal explants","journal":"Development (Cambridge, England)","confidence":"Low","confidence_rationale":"Tier 3 / Weak — initial identification via microarray with gain-of-function, limited mechanistic follow-up in this paper","pmids":["12403722"],"is_preprint":false},{"year":2017,"finding":"TAB3 regulates Survivin expression by activating the NF-κB pathway through formation of a TAK1-TAB3-TRAF6 complex. TAB3 knockdown decreased Survivin expression and suppressed colorectal cancer cell migration and invasion in vitro and liver metastasis in vivo.","method":"Co-immunoprecipitation (TAK1-TAB3-TRAF6 complex), siRNA knockdown, invasion/migration assays, in vivo liver metastasis model","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP for complex, siRNA with functional readouts, in vivo metastasis model, single lab","pmids":["29290971"],"is_preprint":false}],"current_model":"TAB3 (MAP3K7IP3) is an adaptor protein that binds Lys63-linked polyubiquitin chains via its NZF/zinc finger domain, recruits and activates the kinase TAK1 (in complex with TAB1) downstream of IL-1, TNF, TLR, and BCR signaling, and thereby promotes NF-κB, JNK, and p38 MAPK activation; its activity is regulated by p38α-mediated phosphorylation (at Ser60, Thr404, Ser506), O-GlcNAcylation (Ser408), TRAF6-mediated ubiquitination, TRIM30α/USP15-controlled protein stability, and m6A methylation (via METTL3/IGF2BP2) of its mRNA, while it also constitutively inhibits autophagy by sequestering Beclin 1 through coiled-coil domain interactions until autophagy induction triggers its dissociation and engagement with TAK1."},"narrative":{"mechanistic_narrative":"TAB3 is an ubiquitin-binding adaptor that couples innate immune and inflammatory receptors to the kinase TAK1, driving activation of NF-κB and MAPK pathways [PMID:14633987, PMID:14670075]. It associates constitutively with TAK1 (in complex with TAB1) and, upon stimulation, bridges receptor-proximal ubiquitin signals to the kinase: endogenous TAB3 interacts with TRAF6 in an IL-1-dependent manner and with TRAF2 in a TNF-dependent manner and is itself ubiquitinated by TRAF6 [PMID:14633987], while two parallel TAK1-TAB1-TAB2 and TAK1-TAB1-TAB3 complexes are engaged by TNFα, IL-1, and LPS [PMID:14670075]. The defining biochemical activity is preferential recognition of Lys63-linked polyubiquitin chains through its NZF/zinc-finger domain, which engages distal and proximal ubiquitins via a conserved Thr-Phe dipeptide and the Ile44 hydrophobic patch respectively; this binding is essential for TAK1 and IKK activation [PMID:15327770, PMID:19927120], and is specifically required for sustained TAK1 signaling and downstream JNK and p38 activation [PMID:28507161]. TAB3 binds TAK1 through a non-contiguous C-terminal region (residues 479–553), and competition with this region blocks TAK1 phosphorylation and downstream IKK/MAPK activation, RANKL-induced osteoclast differentiation, and related outputs [PMID:17158449]. TAB3 function extends across TLR, CD40, and B-cell receptor signaling—where it links TAK1 to CARMA1 to drive IKK activation [PMID:27497262] and, redundantly with TAB2, supports B-cell development and macrophage pro-inflammatory cytokine production via IκBζ [PMID:23509369, PMID:38567483]—and in some contexts drives MAPK activation independently of TAK1 [PMID:23509369, PMID:30760523]. TAB3 is heavily regulated: p38α phosphorylates it at Ser60, Thr404, and Ser506 in a TAB1-dependent manner [PMID:14670075, PMID:18021073]; its protein and mRNA stability are controlled by TRIM30α-mediated degradation [PMID:18345001], USP15-dependent protection from NBR1 autophagic degradation [PMID:31903660], and METTL3/IGF2BP2 m6A modification of its transcript [PMID:35417191]; and Smad7 antagonizes its assembly into TAK1 complexes [PMID:17384642]. Beyond its kinase-scaffolding role, TAB3 constitutively inhibits autophagy by sequestering Beclin 1 through coiled-coil-domain interactions, releasing it upon autophagy induction to instead engage TAK1 [PMID:22081109].","teleology":[{"year":2003,"claim":"Established TAB3 as a TAK1-binding adaptor that links inflammatory receptors to NF-κB, answering whether a TAB2-like protein bridges IL-1/TNF signals to the kinase.","evidence":"Co-IP, siRNA double-knockdown, and NF-κB reporter assays in mammalian cells","pmids":["14633987"],"confidence":"High","gaps":["Did not define the ubiquitin-binding basis of recruitment","Redundancy with TAB2 left individual contributions unresolved"]},{"year":2004,"claim":"Identified Lys63-polyubiquitin binding by the zinc-finger domain as the essential molecular activity for signaling, explaining how TAB3 senses receptor-proximal ubiquitination.","evidence":"In vitro binding, ZnF mutagenesis, and heterologous ubiquitin-binding-domain swap rescue with IKK activation readouts","pmids":["15327770"],"confidence":"High","gaps":["Structural basis of chain-linkage selectivity not yet resolved","Did not address chain-length requirements in cells"]},{"year":2004,"claim":"Resolved that TAB3 forms a distinct TAK1-TAB1-TAB3 complex parallel to the TAB2 complex and is phosphorylated via p38α upon stimulation, framing TAB3 as both effector and substrate.","evidence":"Co-IP, phosphatase treatment, SB203580 inhibition, and p38α-knockout MEFs","pmids":["14670075"],"confidence":"High","gaps":["Functional consequence of phosphorylation undefined at this stage","Specific phosphosites not mapped"]},{"year":2006,"claim":"Mapped the TAB3-binding interface on TAK1 to a non-contiguous C-terminal region, providing a dominant-negative tool that confirmed TAB3-TAK1 binding is required for receptor-driven IKK/MAPK output and osteoclast differentiation.","evidence":"Deletion mapping, dominant-negative competition, kinase assays, osteoclast differentiation assays","pmids":["17158449"],"confidence":"High","gaps":["Did not establish stoichiometry or whether binding is direct in vitro"]},{"year":2007,"claim":"Revealed Smad7 as a TGF-β-induced antagonist that blocks TAB3 incorporation into TRAF2-TAK1 complexes, connecting TAB3 to crosstalk between TGF-β and NF-κB signaling.","evidence":"Co-IP and Smad7-transgenic mouse skin with NF-κB translocation assays","pmids":["17384642"],"confidence":"High","gaps":["Binding interface on TAB3 for Smad7 not mapped"]},{"year":2008,"claim":"Defined TRIM30α as a TLR-induced negative-feedback regulator that degrades TAB3, and mapped p38α/MAPKAP-K2 phosphosites (Ser60, Thr404, Ser506), establishing layered post-translational control of TAB3.","evidence":"Co-IP, siRNA, transgenic/endotoxic-shock mice (TRIM30α); MS phosphosite mapping and TAB1-knockout MEFs (phosphorylation)","pmids":["18345001","18021073"],"confidence":"High","gaps":["Functional output of each phosphosite on TAK1 activity not fully dissected","Whether TRIM30α ubiquitinates TAB3 directly unresolved"]},{"year":2009,"claim":"Provided atomic-resolution structures of the TAB3 NZF domain bound to Lys63-diubiquitin, defining the distal Thr-Phe and proximal Ile44 contacts that confer chain-linkage specificity.","evidence":"X-ray crystallography at 1.4 Å with site-directed mutagenesis and ubiquitin-binding assays","pmids":["19927120"],"confidence":"High","gaps":["Structure of the full TAB3-TAK1 assembly on polyubiquitin not determined"]},{"year":2011,"claim":"Uncovered a TAK1-independent moonlighting function: TAB3 constitutively sequesters Beclin 1 to suppress autophagy, dissociating upon induction, linking inflammatory signaling components to autophagy control.","evidence":"Co-IP, coiled-coil-domain mapping, overexpression/siRNA with EM and GFP-LC3 autophagy readouts","pmids":["22081109"],"confidence":"High","gaps":["Signal triggering TAB3-Beclin 1 dissociation not identified","Physiological relevance in vivo not established here"]},{"year":2013,"claim":"Showed TAB3 (with TAB2) drives B-cell MAPK activation and B-1/marginal-zone development through a surprising TAK1-independent route, distinguishing its MAPK and NF-κB functions.","evidence":"Conditional double-knockout mice, B-cell stimulation, MAPK/NF-κB activation assays","pmids":["23509369"],"confidence":"High","gaps":["Identity of the TAK1-independent effector kinase unknown","Individual TAB3 vs TAB2 contributions not separated"]},{"year":2014,"claim":"Demonstrated that enterovirus 71 3C protease cleaves TAB3 at defined sites to dismantle the TAK1 complex and suppress NF-κB, identifying TAB3 as a viral immune-evasion target.","evidence":"Protease assays, active-site mutagenesis, cleavage-site mapping, Co-IP, NF-κB reporters","pmids":["24942571"],"confidence":"High","gaps":["Contribution of TAB3 cleavage relative to other complex members not quantified"]},{"year":2017,"claim":"Genetically separated two modes of TAK1 activation, establishing that TAB3-mediated K63-ubiquitin binding is specifically required for sustained TAK1 signaling and JNK/p38γ activation.","evidence":"TAB2/3 double-KO and TAB1/2/3 triple-KO cells with ubiquitin-binding-defective rescue and kinase assays","pmids":["28507161"],"confidence":"High","gaps":["Mechanism of the transient TAB-independent TAK1 activation mode unresolved"]},{"year":2016,"claim":"Extended TAB3 function to antigen-receptor signaling, showing it links TAK1 to CARMA1 for BCR-induced IKK activation, and identified O-GlcNAcylation at Ser408 as a PTM gating Thr404 phosphorylation and TAK1 activation in cancer cells.","evidence":"TAB2/3-deficient DT40 cells with domain-deletion mutants (BCR/CARMA1); O-GlcNAc site mapping with OGT co-expression and kinase assays (Ser408)","pmids":["27497262","27009840"],"confidence":"Medium","gaps":["Each from single labs without independent replication","Direct CARMA1-TAB3 contact vs bridging not distinguished"]},{"year":2019,"claim":"Described a non-canonical TAB1-TAB3-dependent p38 activation pathway downstream of GPCR agonists in endothelial cells, bypassing MKK3/MKK6.","evidence":"siRNA knockdown with p38/MKK phosphorylation and IL-6 readouts across endothelial cell types","pmids":["30760523"],"confidence":"Medium","gaps":["Single lab","Direct biochemical mechanism of MKK bypass not shown"]},{"year":2020,"claim":"Defined two post-transcriptional/post-translational stability controls and oncogenic signaling roles: USP15 protects TAB3 from NBR1 autophagic degradation (deubiquitinase-independent), and TAB3 drives STAT3/PIM1 signaling in colorectal cancer.","evidence":"Co-IP, autophagy-degradation assays, deubiquitinase-dead mutant (USP15); Co-IP, siRNA rescue, xenograft (STAT3/PIM1)","pmids":["31903660","32229191"],"confidence":"Medium","gaps":["Single labs","Direct vs indirect TAB3-STAT3 association not fully resolved"]},{"year":2022,"claim":"Established m6A control of TAB3 expression: METTL3 deposits m6A on TAB3 mRNA and IGF2BP2 reads it to stabilize the transcript, linking the methylation machinery to TAB3-driven renal inflammation.","evidence":"m6A-RIP-seq, RNA-IP, METTL3 conditional-KO mice with knockdown/overexpression","pmids":["35417191"],"confidence":"High","gaps":["Whether m6A-dependent TAB3 induction operates outside renal inflammation untested"]},{"year":2024,"claim":"Confirmed in primary macrophages that TAB3 is redundantly required with TAB2 for TLR-induced NF-κB/MAPK activation and IκBζ-dependent IL-6 production, consolidating its role in innate immune cytokine output.","evidence":"TAB2/3 double-deficient bone-marrow-derived macrophages, cytokine ELISA, phosphorylation and IκBζ expression assays","pmids":["38567483"],"confidence":"High","gaps":["TAB3-specific (non-redundant) functions in macrophages not isolated"]},{"year":null,"claim":"The signal and machinery that trigger TAB3 dissociation from Beclin 1, and the identity of the TAK1-independent effector that mediates TAB3-driven MAPK activation, remain undefined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No effector kinase identified for TAK1-independent TAB3 MAPK signaling","Dissociation trigger for TAB3-Beclin 1 complex unknown","No integrated structure of TAB3-TAK1 on polyubiquitin"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,2,3,16]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[8]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[1,2]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1,2,18]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,3,13]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[8,14]}],"complexes":["TAK1-TAB1-TAB3 complex"],"partners":["MAP3K7","TAB1","TRAF6","TRAF2","BECN1","SMAD7","CARD11","USP15"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8N5C8","full_name":"TGF-beta-activated kinase 1 and MAP3K7-binding protein 3","aliases":["Mitogen-activated protein kinase kinase kinase 7-interacting protein 3","NF-kappa-B-activating protein 1","TAK1-binding protein 3","TAB-3","TGF-beta-activated kinase 1-binding protein 3"],"length_aa":712,"mass_kda":78.7,"function":"Adapter required to activate the JNK and NF-kappa-B signaling pathways through the specific recognition of 'Lys-63'-linked polyubiquitin chains by its RanBP2-type zinc finger (NZF) (PubMed:14633987, PubMed:14766965, PubMed:15327770, PubMed:22158122). Acts as an adapter linking MAP3K7/TAK1 and TRAF6 to 'Lys-63'-linked polyubiquitin chains (PubMed:14633987, PubMed:14766965, PubMed:15327770, PubMed:22158122, PubMed:36593296). The RanBP2-type zinc finger (NZF) specifically recognizes Lys-63'-linked polyubiquitin chains unanchored or anchored to the substrate proteins such as RIPK1/RIP1 and RIPK2: this acts as a scaffold to organize a large signaling complex to promote autophosphorylation of MAP3K7/TAK1, and subsequent activation of I-kappa-B-kinase (IKK) core complex by MAP3K7/TAK1 (PubMed:15327770, PubMed:18079694, PubMed:22158122) May be an oncogenic factor","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q8N5C8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TAB3","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}],"url":"https://opencell.sf.czbiohub.org/search/TAB3","total_profiled":1310},"omim":[{"mim_id":"621011","title":"SEC14 AND SPECTRIN DOMAINS-CONTAINING PROTEIN 1; SESTD1","url":"https://www.omim.org/entry/621011"},{"mim_id":"613363","title":"DYNEIN, CYTOPLASMIC 2, INTERMEDIATE CHAIN 2; DYNC2I2","url":"https://www.omim.org/entry/613363"},{"mim_id":"605101","title":"TAK1-BINDING PROTEIN 2; TAB2","url":"https://www.omim.org/entry/605101"},{"mim_id":"301023","title":"MICRO RNA 532; MIR532","url":"https://www.omim.org/entry/301023"},{"mim_id":"300874","title":"MICRO RNA 508; MIR508","url":"https://www.omim.org/entry/300874"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nuclear speckles","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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Mutations of the ZnF domain abolish polyubiquitin binding and the ability to activate TAK1 and IKK. Replacement of the ZnF domain with a heterologous ubiquitin-binding domain restored TAK1 and IKK activation, demonstrating that polyubiquitin binding is essential for signaling.\",\n      \"method\": \"In vitro binding assays, ZnF domain mutagenesis, heterologous domain replacement, IKK activation assays\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution, active-site mutagenesis, and domain-swap rescue in a single rigorous study\",\n      \"pmids\": [\"15327770\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"TAB3 physically associates with TAK1 and activates NF-κB. Endogenous TAB3 interacts with TRAF6 in an IL-1-dependent manner and with TRAF2 in a TNF-dependent manner. IL-1 signaling leads to TRAF6-mediated ubiquitination of TAB3. siRNA knockdown of both TAB2 and TAB3 inhibits IL-1- and TNF-induced TAK1 and NF-κB activation, indicating redundant roles.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, NF-κB reporter assays, ubiquitination assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, siRNA functional rescue, multiple orthogonal methods, replicated across labs\",\n      \"pmids\": [\"14633987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TAB3 forms two distinct TAK1 complexes in cells: one containing TAK1-TAB1-TAB2 and another containing TAK1-TAB1-TAB3. Both complexes are activated by TNF-α, IL-1, or LPS. TAB3 electrophoretic mobility decreases upon stimulation and is reversed by protein phosphatase-1, indicating phosphorylation. TAB3 phosphorylation is prevented by the p38 MAPK inhibitor SB203580, indicating TAB3 is phosphorylated via the SAPK2a/p38α pathway.\",\n      \"method\": \"Co-immunoprecipitation, kinase assays, phosphatase treatment, SB203580 inhibitor experiments, p38α-knockout MEFs\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, knockout MEFs, pharmacological inhibition, multiple orthogonal methods\",\n      \"pmids\": [\"14670075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The TAB2/TAB3-binding domain on TAK1 maps to a non-contiguous region within the last C-terminal 100 residues (residues 479–553 necessary and sufficient). Residues 574–693 of TAB2 mediate interaction with TAK1. A GFP-TAK1-C100 fusion protein abolished endogenous TAB2/TAB3 interaction with TAK1, blocked TAK1 phosphorylation, and prevented IKK and MAPK activation by IL-1, TNF, and RANKL, as well as RANKL-induced NFATc1 nuclear accumulation and osteoclast differentiation.\",\n      \"method\": \"Deletion mapping, Co-immunoprecipitation, dominant-negative competition assay, kinase assays, osteoclast differentiation assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain mapping with deletion constructs, dominant-negative competition, multiple downstream readouts\",\n      \"pmids\": [\"17158449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Crystal structures of TAB2 and TAB3 NZF domains in complex with Lys63-linked diubiquitin resolved at 1.18 Å and 1.40 Å, respectively. Both NZF domains bind the distal ubiquitin via a conserved Thr-Phe dipeptide. A surface specific to TAB2/TAB3 binds the proximal ubiquitin via the Ile44-centered hydrophobic patch. Mutagenesis confirmed both distal and proximal binding sites are required for Lys63-linked diubiquitin binding.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, ubiquitin binding assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures with functional mutagenesis validation, high-resolution data\",\n      \"pmids\": [\"19927120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TGF-β-induced Smad7 binds directly to TAB2 and TAB3, blocking recruitment of TAK1 to TRAF2. Formation of Smad7-TAB2 and Smad7-TAB3 complexes suppresses TNF-induced TRAF2-TAB2/TAB3-TAK1 complex assembly. In mouse skin expressing a Smad7 transgene, endogenous TRAF2-TAK1-TAB3 complexes were disrupted and NF-κB nuclear translocation was suppressed.\",\n      \"method\": \"Co-immunoprecipitation, transgenic mouse model, NF-κB nuclear translocation assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, in vivo transgenic validation, mechanistic pathway placement\",\n      \"pmids\": [\"17384642\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TRIM30α, induced by TLR agonists, interacts with the TAB2-TAB3-TAK1 complex and promotes degradation of TAB2 and TAB3, thereby inhibiting NF-κB activation. This constitutes a negative feedback mechanism of TLR signaling.\",\n      \"method\": \"Co-immunoprecipitation, overexpression and transgenic mouse studies, siRNA knockdown, NF-κB activation assays\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, transgenic mouse, siRNA knockdown, in vivo endotoxic shock model\",\n      \"pmids\": [\"18345001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Three IL-1-stimulated phosphorylation sites on TAB3 were identified: Ser60, Thr404, and Ser506. Ser60 and Thr404 are phosphorylated directly by p38α MAPK, while Ser506 is phosphorylated by MAPKAP-K2/K3 (downstream of p38α). TAB1 is required to recruit p38α to the TAK1 complex for TAB3 phosphorylation at Ser60 and Thr404, and to prevent dephosphorylation of TAB3 at Ser506.\",\n      \"method\": \"Mass spectrometry-based phosphosite mapping, TAB1-knockout MEFs, kinase assays with specific inhibitors\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — phosphosite mapping by MS, genetic knockout validation, kinase hierarchy established\",\n      \"pmids\": [\"18021073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TAB2 and TAB3 constitutively interact with the autophagy mediator Beclin 1 via their coiled-coil domains (CCDs), inhibiting autophagy. Upon autophagy induction, TAB2 and TAB3 dissociate from Beclin 1 and bind TAK1. Overexpression of TAB2/TAB3 suppresses autophagy, while their depletion triggers autophagy. Expression of the C-terminal domain of TAB3 or the CCD of Beclin 1 disrupts this interaction and stimulates autophagy through a pathway requiring endogenous Beclin 1, TAK1, and IKK.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping (CCD), overexpression and siRNA depletion, autophagy readouts (electron microscopy, GFP-LC3 puncta)\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, domain-specific constructs, genetic depletion with defined phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"22081109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"TAB2 and TAB3 are essential for B cell activation and B-1/marginal zone B cell development. In B cells lacking both TAB2 and TAB3, MAPK (especially ERK) activation is abolished in response to TLR and CD40 stimulation, whereas NF-κB activation is unaffected. Surprisingly, TAB2/TAB3-mediated MAPK activation in B cells occurs via a pathway independent of TAK1.\",\n      \"method\": \"Conditional double knockout mouse model, B cell stimulation assays, MAPK and NF-κB activation assays, B cell development analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic double knockout, multiple signaling readouts, unexpected TAK1-independent pathway established\",\n      \"pmids\": [\"23509369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Enterovirus 71 3C protease cleaves TAB3 at two sites (Q173-G174 and Q343-G344), requiring 3C protease activity. H40D or C147S substitutions in 3C active sites abolish cleavage. EV71 3C interacts with TAB2 and TAK1, and cleavage of the TAK1/TAB1/TAB2/TAB3 complex inhibits NF-κB activation and cytokine production.\",\n      \"method\": \"Protease activity assays, active-site mutagenesis, Co-immunoprecipitation, NF-κB reporter assays, cleavage site mapping\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — active-site mutagenesis, precise cleavage-site mapping, Co-IP, functional NF-κB assays\",\n      \"pmids\": [\"24942571\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"IL-1β can activate the TAB1-TAK1 heterodimer in TAB2/TAB3 double knockout cells, but signaling is transient. TAB2/TAB3 are required for sustained TAK1 activation and for JNK1/2 and p38γ activation. Re-expression of TAB1 or TAB2 (but not an ubiquitin binding-defective mutant of TAB2) restores IL-1β signaling in TAB1/2/3 triple KO cells, establishing that K63-Ub chain binding by TAB2/TAB3 is required for one mode of TAK1 activation.\",\n      \"method\": \"TAB2/TAB3 double KO and TAB1/2/3 triple KO cell lines, re-expression rescue experiments, kinase assays, ubiquitin-binding mutant TAB2\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic KO lines, rescue with binding-defective mutant, multiple kinase pathway readouts\",\n      \"pmids\": [\"28507161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TAB3 is O-GlcNAcylated at Ser408 by OGT in triple negative breast cancer cells. This O-GlcNAcylation at Ser408 is required for Thr404 phosphorylation of TAB3, TAK1 activation, and downstream NF-κB activation. O-GlcNAcylation of TAB3 is induced by p38 MAPK and in turn enhances TAK1-mediated p38 MAPK activation, forming a positive feedback loop.\",\n      \"method\": \"O-GlcNAc site mapping (Ser408), site-directed mutagenesis, OGT co-expression, kinase activation assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — PTM site identified with mutagenesis, functional kinase assays, single lab\",\n      \"pmids\": [\"27009840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Multiple GPCR agonists (thrombin, histamine, PGE2, ADP) activate p38 MAPK via a non-canonical TAB1-TAB3-dependent pathway in primary human endothelial cells (HUVECs), bypassing canonical MKK3/MKK6 upstream kinases. TAB3 expression is confirmed in endothelial cells, and thrombin-induced p38 activation in HDMECs specifically depends on TAB1-TAB3 (not TAB1-TAB2). IL-6 production required both TAB1-TAB2 and TAB1-TAB3.\",\n      \"method\": \"siRNA knockdown, p38 and MKK3/6 phosphorylation assays, IL-6 ELISA, multiple endothelial cell types\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA knockdown with specific functional readouts, multiple cell types, single lab\",\n      \"pmids\": [\"30760523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"USP15 stabilizes TAB3 by inhibiting NBR1-mediated selective autophagic degradation of TAB3, independent of USP15's deubiquitinating activity. This TAB3 stabilization potentiates NF-κB activation downstream of TNFα and IL-1β.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, lysosome inhibitor experiments, siRNA knockdown, NF-κB reporter assays\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, autophagic degradation assays, deubiquitinase-dead mutant, single lab\",\n      \"pmids\": [\"31903660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL3 promotes m6A modification of TAB3 mRNA at its stop codon region. IGF2BP2 reads this m6A modification and stabilizes TAB3 mRNA. METTL3 knockdown reduces TAB3 protein levels and attenuates renal inflammation; METTL3 overexpression increases TAB3 stability and promotes inflammation. This mechanism was validated in vitro and in conditional METTL3 knockout mouse models.\",\n      \"method\": \"m6A-RIP sequencing, RNA-IP (IGF2BP2 pulldown), METTL3 conditional knockout mice, siRNA knockdown and overexpression\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — m6A-RIP-seq, RNA-IP, conditional KO mice, multiple orthogonal methods across in vitro and in vivo models\",\n      \"pmids\": [\"35417191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TAB2 and TAB3 connect signaling molecules to activate IKK in B-cell receptor (BCR) signaling by linking TAK1 to CARMA1. Loss of TAB2 and TAB3 abolished BCR-induced IKK activation and TAK1 association with CARMA1. Deletion of TAB3 domains (ubiquitin-conjugation-to-ER degradation domain, coiled-coil domain, and zinc finger domain) each blocked IKK activation and CARMA1 association.\",\n      \"method\": \"TAB2/TAB3-deficient DT40 B cell lines, domain deletion mutants, Co-immunoprecipitation, IKK activation assays\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic deletion with domain mutants, Co-IP, single lab\",\n      \"pmids\": [\"27497262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TAB3 promotes STAT3 phosphorylation through formation of a TAB3-TAK1-STAT3 complex, leading to upregulation of PIM1 expression and colorectal cancer proliferation. TAB3 knockdown decreased STAT3 phosphorylation and PIM1 expression; PIM1 overexpression rescued proliferation defects caused by TAB3 knockdown.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, rescue overexpression experiments, xenograft tumor assays, immunoblotting\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for complex, rescue experiments, in vivo xenograft, single lab\",\n      \"pmids\": [\"32229191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TAB2 and TAB3 are redundantly required in macrophages for TLR-induced NF-κB and MAPK activation and pro-inflammatory cytokine/chemokine production. Double deficiency of TAB2 and TAB3 severely impairs IκBζ expression at mRNA and protein levels, thereby impairing IL-6 production in response to LPS or Pam3CSK4.\",\n      \"method\": \"TAB2/TAB3 double-deficient bone marrow-derived macrophages, cytokine ELISA, NF-κB and MAPK phosphorylation assays, IκBζ expression analysis\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic double KO in primary macrophages, multiple signaling and functional readouts, improved mouse model\",\n      \"pmids\": [\"38567483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TAB3 was identified in Xenopus laevis as a novel TAK1-binding protein with a role in regulating TAK1 activity during neural induction, with a proposed model of BMP inhibition partly through TAK1 regulation.\",\n      \"method\": \"Xenopus cDNA microarray, gain-of-function studies in ectodermal explants\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — initial identification via microarray with gain-of-function, limited mechanistic follow-up in this paper\",\n      \"pmids\": [\"12403722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TAB3 regulates Survivin expression by activating the NF-κB pathway through formation of a TAK1-TAB3-TRAF6 complex. TAB3 knockdown decreased Survivin expression and suppressed colorectal cancer cell migration and invasion in vitro and liver metastasis in vivo.\",\n      \"method\": \"Co-immunoprecipitation (TAK1-TAB3-TRAF6 complex), siRNA knockdown, invasion/migration assays, in vivo liver metastasis model\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP for complex, siRNA with functional readouts, in vivo metastasis model, single lab\",\n      \"pmids\": [\"29290971\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TAB3 (MAP3K7IP3) is an adaptor protein that binds Lys63-linked polyubiquitin chains via its NZF/zinc finger domain, recruits and activates the kinase TAK1 (in complex with TAB1) downstream of IL-1, TNF, TLR, and BCR signaling, and thereby promotes NF-κB, JNK, and p38 MAPK activation; its activity is regulated by p38α-mediated phosphorylation (at Ser60, Thr404, Ser506), O-GlcNAcylation (Ser408), TRAF6-mediated ubiquitination, TRIM30α/USP15-controlled protein stability, and m6A methylation (via METTL3/IGF2BP2) of its mRNA, while it also constitutively inhibits autophagy by sequestering Beclin 1 through coiled-coil domain interactions until autophagy induction triggers its dissociation and engagement with TAK1.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TAB3 is an ubiquitin-binding adaptor that couples innate immune and inflammatory receptors to the kinase TAK1, driving activation of NF-\\u03baB and MAPK pathways [#1, #2]. It associates constitutively with TAK1 (in complex with TAB1) and, upon stimulation, bridges receptor-proximal ubiquitin signals to the kinase: endogenous TAB3 interacts with TRAF6 in an IL-1-dependent manner and with TRAF2 in a TNF-dependent manner and is itself ubiquitinated by TRAF6 [#1], while two parallel TAK1-TAB1-TAB2 and TAK1-TAB1-TAB3 complexes are engaged by TNF\\u03b1, IL-1, and LPS [#2]. The defining biochemical activity is preferential recognition of Lys63-linked polyubiquitin chains through its NZF/zinc-finger domain, which engages distal and proximal ubiquitins via a conserved Thr-Phe dipeptide and the Ile44 hydrophobic patch respectively; this binding is essential for TAK1 and IKK activation [#0, #4], and is specifically required for sustained TAK1 signaling and downstream JNK and p38 activation [#11]. TAB3 binds TAK1 through a non-contiguous C-terminal region (residues 479\\u2013553), and competition with this region blocks TAK1 phosphorylation and downstream IKK/MAPK activation, RANKL-induced osteoclast differentiation, and related outputs [#3]. TAB3 function extends across TLR, CD40, and B-cell receptor signaling\\u2014where it links TAK1 to CARMA1 to drive IKK activation [#16] and, redundantly with TAB2, supports B-cell development and macrophage pro-inflammatory cytokine production via I\\u03baB\\u03b6 [#9, #18]\\u2014and in some contexts drives MAPK activation independently of TAK1 [#9, #13]. TAB3 is heavily regulated: p38\\u03b1 phosphorylates it at Ser60, Thr404, and Ser506 in a TAB1-dependent manner [#2, #7]; its protein and mRNA stability are controlled by TRIM30\\u03b1-mediated degradation [#6], USP15-dependent protection from NBR1 autophagic degradation [#14], and METTL3/IGF2BP2 m6A modification of its transcript [#15]; and Smad7 antagonizes its assembly into TAK1 complexes [#5]. Beyond its kinase-scaffolding role, TAB3 constitutively inhibits autophagy by sequestering Beclin 1 through coiled-coil-domain interactions, releasing it upon autophagy induction to instead engage TAK1 [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established TAB3 as a TAK1-binding adaptor that links inflammatory receptors to NF-\\u03baB, answering whether a TAB2-like protein bridges IL-1/TNF signals to the kinase.\",\n      \"evidence\": \"Co-IP, siRNA double-knockdown, and NF-\\u03baB reporter assays in mammalian cells\",\n      \"pmids\": [\"14633987\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the ubiquitin-binding basis of recruitment\", \"Redundancy with TAB2 left individual contributions unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified Lys63-polyubiquitin binding by the zinc-finger domain as the essential molecular activity for signaling, explaining how TAB3 senses receptor-proximal ubiquitination.\",\n      \"evidence\": \"In vitro binding, ZnF mutagenesis, and heterologous ubiquitin-binding-domain swap rescue with IKK activation readouts\",\n      \"pmids\": [\"15327770\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of chain-linkage selectivity not yet resolved\", \"Did not address chain-length requirements in cells\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved that TAB3 forms a distinct TAK1-TAB1-TAB3 complex parallel to the TAB2 complex and is phosphorylated via p38\\u03b1 upon stimulation, framing TAB3 as both effector and substrate.\",\n      \"evidence\": \"Co-IP, phosphatase treatment, SB203580 inhibition, and p38\\u03b1-knockout MEFs\",\n      \"pmids\": [\"14670075\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of phosphorylation undefined at this stage\", \"Specific phosphosites not mapped\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mapped the TAB3-binding interface on TAK1 to a non-contiguous C-terminal region, providing a dominant-negative tool that confirmed TAB3-TAK1 binding is required for receptor-driven IKK/MAPK output and osteoclast differentiation.\",\n      \"evidence\": \"Deletion mapping, dominant-negative competition, kinase assays, osteoclast differentiation assays\",\n      \"pmids\": [\"17158449\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish stoichiometry or whether binding is direct in vitro\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Revealed Smad7 as a TGF-\\u03b2-induced antagonist that blocks TAB3 incorporation into TRAF2-TAK1 complexes, connecting TAB3 to crosstalk between TGF-\\u03b2 and NF-\\u03baB signaling.\",\n      \"evidence\": \"Co-IP and Smad7-transgenic mouse skin with NF-\\u03baB translocation assays\",\n      \"pmids\": [\"17384642\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding interface on TAB3 for Smad7 not mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined TRIM30\\u03b1 as a TLR-induced negative-feedback regulator that degrades TAB3, and mapped p38\\u03b1/MAPKAP-K2 phosphosites (Ser60, Thr404, Ser506), establishing layered post-translational control of TAB3.\",\n      \"evidence\": \"Co-IP, siRNA, transgenic/endotoxic-shock mice (TRIM30\\u03b1); MS phosphosite mapping and TAB1-knockout MEFs (phosphorylation)\",\n      \"pmids\": [\"18345001\", \"18021073\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional output of each phosphosite on TAK1 activity not fully dissected\", \"Whether TRIM30\\u03b1 ubiquitinates TAB3 directly unresolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Provided atomic-resolution structures of the TAB3 NZF domain bound to Lys63-diubiquitin, defining the distal Thr-Phe and proximal Ile44 contacts that confer chain-linkage specificity.\",\n      \"evidence\": \"X-ray crystallography at 1.4 \\u00c5 with site-directed mutagenesis and ubiquitin-binding assays\",\n      \"pmids\": [\"19927120\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the full TAB3-TAK1 assembly on polyubiquitin not determined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Uncovered a TAK1-independent moonlighting function: TAB3 constitutively sequesters Beclin 1 to suppress autophagy, dissociating upon induction, linking inflammatory signaling components to autophagy control.\",\n      \"evidence\": \"Co-IP, coiled-coil-domain mapping, overexpression/siRNA with EM and GFP-LC3 autophagy readouts\",\n      \"pmids\": [\"22081109\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signal triggering TAB3-Beclin 1 dissociation not identified\", \"Physiological relevance in vivo not established here\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed TAB3 (with TAB2) drives B-cell MAPK activation and B-1/marginal-zone development through a surprising TAK1-independent route, distinguishing its MAPK and NF-\\u03baB functions.\",\n      \"evidence\": \"Conditional double-knockout mice, B-cell stimulation, MAPK/NF-\\u03baB activation assays\",\n      \"pmids\": [\"23509369\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the TAK1-independent effector kinase unknown\", \"Individual TAB3 vs TAB2 contributions not separated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated that enterovirus 71 3C protease cleaves TAB3 at defined sites to dismantle the TAK1 complex and suppress NF-\\u03baB, identifying TAB3 as a viral immune-evasion target.\",\n      \"evidence\": \"Protease assays, active-site mutagenesis, cleavage-site mapping, Co-IP, NF-\\u03baB reporters\",\n      \"pmids\": [\"24942571\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution of TAB3 cleavage relative to other complex members not quantified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Genetically separated two modes of TAK1 activation, establishing that TAB3-mediated K63-ubiquitin binding is specifically required for sustained TAK1 signaling and JNK/p38\\u03b3 activation.\",\n      \"evidence\": \"TAB2/3 double-KO and TAB1/2/3 triple-KO cells with ubiquitin-binding-defective rescue and kinase assays\",\n      \"pmids\": [\"28507161\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of the transient TAB-independent TAK1 activation mode unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended TAB3 function to antigen-receptor signaling, showing it links TAK1 to CARMA1 for BCR-induced IKK activation, and identified O-GlcNAcylation at Ser408 as a PTM gating Thr404 phosphorylation and TAK1 activation in cancer cells.\",\n      \"evidence\": \"TAB2/3-deficient DT40 cells with domain-deletion mutants (BCR/CARMA1); O-GlcNAc site mapping with OGT co-expression and kinase assays (Ser408)\",\n      \"pmids\": [\"27497262\", \"27009840\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Each from single labs without independent replication\", \"Direct CARMA1-TAB3 contact vs bridging not distinguished\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Described a non-canonical TAB1-TAB3-dependent p38 activation pathway downstream of GPCR agonists in endothelial cells, bypassing MKK3/MKK6.\",\n      \"evidence\": \"siRNA knockdown with p38/MKK phosphorylation and IL-6 readouts across endothelial cell types\",\n      \"pmids\": [\"30760523\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct biochemical mechanism of MKK bypass not shown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined two post-transcriptional/post-translational stability controls and oncogenic signaling roles: USP15 protects TAB3 from NBR1 autophagic degradation (deubiquitinase-independent), and TAB3 drives STAT3/PIM1 signaling in colorectal cancer.\",\n      \"evidence\": \"Co-IP, autophagy-degradation assays, deubiquitinase-dead mutant (USP15); Co-IP, siRNA rescue, xenograft (STAT3/PIM1)\",\n      \"pmids\": [\"31903660\", \"32229191\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single labs\", \"Direct vs indirect TAB3-STAT3 association not fully resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established m6A control of TAB3 expression: METTL3 deposits m6A on TAB3 mRNA and IGF2BP2 reads it to stabilize the transcript, linking the methylation machinery to TAB3-driven renal inflammation.\",\n      \"evidence\": \"m6A-RIP-seq, RNA-IP, METTL3 conditional-KO mice with knockdown/overexpression\",\n      \"pmids\": [\"35417191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether m6A-dependent TAB3 induction operates outside renal inflammation untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Confirmed in primary macrophages that TAB3 is redundantly required with TAB2 for TLR-induced NF-\\u03baB/MAPK activation and I\\u03baB\\u03b6-dependent IL-6 production, consolidating its role in innate immune cytokine output.\",\n      \"evidence\": \"TAB2/3 double-deficient bone-marrow-derived macrophages, cytokine ELISA, phosphorylation and I\\u03baB\\u03b6 expression assays\",\n      \"pmids\": [\"38567483\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"TAB3-specific (non-redundant) functions in macrophages not isolated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The signal and machinery that trigger TAB3 dissociation from Beclin 1, and the identity of the TAK1-independent effector that mediates TAB3-driven MAPK activation, remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No effector kinase identified for TAK1-independent TAB3 MAPK signaling\", \"Dissociation trigger for TAB3-Beclin 1 complex unknown\", \"No integrated structure of TAB3-TAK1 on polyubiquitin\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 2, 3, 16]},\n      {\"term_id\": \"GO:0043130\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1, 2, 18]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 3, 13]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [8, 14]}\n    ],\n    \"complexes\": [\n      \"TAK1-TAB1-TAB3 complex\"\n    ],\n    \"partners\": [\n      \"MAP3K7\",\n      \"TAB1\",\n      \"TRAF6\",\n      \"TRAF2\",\n      \"BECN1\",\n      \"SMAD7\",\n      \"CARD11\",\n      \"USP15\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}