{"gene":"TRAF2","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":1995,"finding":"TRAF2 overexpression is sufficient to activate NF-κB, and a truncated TRAF2 lacking the N-terminal RING finger domain acts as a dominant-negative inhibitor of NF-κB activation by TNF-R2 and CD40, establishing TRAF2 as a common mediator of TNF-R2 and CD40 signaling to NF-κB.","method":"Overexpression and dominant-negative mutant analysis in transfected cells; NF-κB reporter assays","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — dominant-negative mutagenesis with functional readout, replicated across multiple receptor systems, foundational paper widely confirmed","pmids":["7544915"],"is_preprint":false},{"year":1998,"finding":"ASK1 physically interacts with TRAF2 in a TNF-dependent manner and is activated by TRAF2 overexpression; a catalytically inactive ASK1 mutant blocks TRAF2-induced JNK activation, placing ASK1 downstream of TRAF2 in TNF-induced JNK signaling.","method":"Co-immunoprecipitation (endogenous, TNF-dependent), overexpression, dominant-negative kinase mutant, JNK activation assays","journal":"Molecular Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus dominant-negative kinase mutagenesis with clear pathway epistasis","pmids":["9774977"],"is_preprint":false},{"year":1999,"finding":"TRAF2 forms a ternary signaling complex with TANK and TBK1 (a novel IKK-related kinase) that functions upstream of NIK and the IKK complex to activate NF-κB; complex formation is required for TBK1 kinase activity.","method":"Co-immunoprecipitation, kinase-dead TBK1 dominant-negative, NF-κB reporter assays","journal":"EMBO Journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — ternary complex demonstrated by Co-IP, kinase-dead dominant-negative validates requirement, multiple orthogonal methods","pmids":["10581243"],"is_preprint":false},{"year":1999,"finding":"Crystal structure of the TRAF2 TRAF domain reveals a trimeric self-association; the TRAF-C domain forms an eight-stranded antiparallel β-sandwich; TNF-R2 peptide binds a conserved shallow surface depression on one TRAF-C protomer; an SXXE motif is identified as a TRAF2-binding consensus sequence; trimeric structure provides avidity-based mechanism for receptor-oligomerization-dependent TRAF recruitment.","method":"X-ray crystallography (TRAF domain alone and in complex with TNF-R2 peptide), solution studies confirming trimeric assembly","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional validation and solution studies; foundational structural paper","pmids":["10206649"],"is_preprint":false},{"year":1996,"finding":"A20 interacts with TRAF1 and TRAF2 through its N-terminal domain binding to the conserved TRAF-C domain, and its C-terminal zinc finger domain mediates inhibition of TRAF2-induced NF-κB activation, defining a negative feedback loop.","method":"Co-immunoprecipitation, mutational analysis, co-transfection NF-κB reporter assays","journal":"PNAS","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal domain-mapping mutagenesis plus functional NF-κB inhibition assays, replicated","pmids":["8692885"],"is_preprint":false},{"year":2002,"finding":"TNF-RII engagement induces ubiquitination and proteasomal degradation of TRAF2 by c-IAP1, which binds TRAF2 in vitro and acts as an E3 ubiquitin ligase; an E3-defective c-IAP1 mutant prevents TRAF2 degradation and inhibits TNF-induced apoptosis.","method":"In vitro ubiquitination assay, E3-defective mutant, co-immunoprecipitation, proteasome inhibitor experiments","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro ubiquitination assay with E3-defective mutant, physiological confirmation in cells","pmids":["11907583"],"is_preprint":false},{"year":2004,"finding":"TRAF2 ubiquitination via its RING and zinc finger domains, dependent on the E2 enzyme Ubc13, is required for TNFα-induced JNK activation but not for p38 or NF-κB activation; TRAF2 ubiquitination coincides with translocation to the insoluble cellular fraction.","method":"RNAi knockdown of Ubc13, RING domain mutagenesis, subcellular fractionation, JNK/IKK/p38 activation assays","journal":"EMBO Journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — RING mutagenesis plus RNAi with multiple pathway readouts and fractionation in single study","pmids":["14713952"],"is_preprint":false},{"year":2008,"finding":"TRAF2 mediates K63-linked ubiquitination of cIAP1 and cIAP2, activating their E3 ubiquitin ligase activity toward TRAF3; upon CD40 or BAFF-R activation, cIAP1/2 ubiquitinate TRAF3 for degradation, releasing NIK from the cIAP1-cIAP2-TRAF2 complex, leading to NIK stabilization and NF-κB2-p100 processing (alternative NF-κB pathway).","method":"Genetic deletion models, ubiquitination assays, biochemical reconstitution of complex, immunoprecipitation","journal":"Nature Immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models plus biochemical ubiquitination assays, replicated concept across labs","pmids":["18997792"],"is_preprint":false},{"year":2009,"finding":"PKC kinases phosphorylate TRAF2, facilitating recruitment of IKKα and IKKβ to the TNF receptor; phosphorylated TRAF2 undergoes K63-linked polyubiquitination at lysine 31, promoting TAB2/3 association and downstream IKK and JNK activation.","method":"In vitro phosphorylation assays, site-directed mutagenesis (K31), co-immunoprecipitation, ubiquitination assays","journal":"Molecular Cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus mutagenesis of phosphorylation and ubiquitination sites with functional pathway readouts","pmids":["19150425"],"is_preprint":false},{"year":2010,"finding":"Crystal structures of the TRAF2:cIAP2 and TRAF1:TRAF2:cIAP2 complexes show a TRAF2 trimer interacts with one cIAP2, with two chains of the TRAF2 trimer directly contacting cIAP2; TRAF1 preferentially forms a TRAF1:(TRAF2)₂ heterotrimer that binds cIAP2 more strongly, suggesting TRAF1 upregulation modulates TRAF2-cIAP1/2 interactions in TNF signaling.","method":"X-ray crystallography, mutagenesis of interface residues, solution binding studies","journal":"Molecular Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structures with interface mutagenesis and solution validation","pmids":["20385093"],"is_preprint":false},{"year":2017,"finding":"TRAF2 acts as an E3 ubiquitin ligase that promotes K63-linked polyubiquitination of GβL (MLST8), disrupting its interaction with the mTORC2-specific component SIN1 to favor mTORC1 formation over mTORC2; the deubiquitinase OTUD7B reverses this to promote mTORC2 assembly.","method":"In vitro ubiquitination assay, Co-immunoprecipitation, mutagenesis of GβL ubiquitination sites (K305R/K313R), genetic deletion in mice","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro ubiquitination, mutagenesis, and in vivo genetic validation in multiple experimental systems","pmids":["28489822"],"is_preprint":false},{"year":2004,"finding":"In B cells lacking TRAF2, canonical NF-κB activation by CD40 ligation is abolished while noncanonical NF-κB (p100-to-p52 processing, RelB) is constitutively hyperactive, establishing TRAF2 as a positive regulator of canonical and negative regulator of noncanonical NF-κB.","method":"Conditional knockout mouse (B cell-specific TRAF2 deletion), NF-κB DNA binding assays, functional B cell proliferation assays","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean conditional KO with multiple orthogonal NF-κB pathway readouts","pmids":["15539150"],"is_preprint":false},{"year":2002,"finding":"Sphingosine kinase (SphK) associates with TRAF2 via a TRAF2-binding motif, and this interaction activates SphK, which is required for TRAF2-mediated NF-κB activation and antiapoptotic signaling but not for JNK activation; dominant-negative SphK or SphK lacking the TRAF2-binding motif blocks NF-κB but not JNK.","method":"Co-immunoprecipitation, dominant-negative and binding-motif mutant SphK, NF-κB and JNK activation assays, apoptosis assays","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus domain mutagenesis and functional readouts, single lab","pmids":["11777919"],"is_preprint":false},{"year":2005,"finding":"Upon TNF-R2 signaling, TRAF2 and c-IAP1 translocate to a perinuclear, Triton X-100-insoluble compartment that co-localizes with the ER; the ER-resident E2 enzyme Ubc6 binds c-IAP1 and acts as a cognate E2 for c-IAP1-mediated TRAF2 ubiquitination in this compartment; catalytically inactive Ubc6 inhibits TNF-R2-dependent TRAF2 degradation.","method":"Confocal microscopy with ER markers, in vitro E2/E3 ubiquitination assay, dominant-negative Ubc6 mutant, subcellular fractionation","journal":"EMBO Journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro ubiquitination reconstitution, localization by confocal microscopy, and dominant-negative confirmation in a single study","pmids":["15861135"],"is_preprint":false},{"year":2006,"finding":"GSTP1-1 physically associates with TRAF2 in vivo and in vitro via the TRAF domain-binding motif; GSTP1-1 overexpression inhibits TRAF2-induced JNK and p38 (but not NF-κB) activation by suppressing TRAF2-ASK1 interaction; GSTP1-1 RNAi increases TRAF2-ASK1 association and hyper-activates ASK1 and JNK.","method":"Co-immunoprecipitation (in vivo and in vitro), GSTP1-1 mutant lacking TRAF domain-binding motif, RNAi, kinase activation assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus domain-mapping mutant and RNAi, single lab","pmids":["16636664"],"is_preprint":false},{"year":2012,"finding":"IKKε phosphorylates TRAF2 at Ser11 in vitro and in vivo; this phosphorylation promotes K63-linked TRAF2 ubiquitination and NF-κB activation, and is essential for IKKε-driven mammary epithelial cell transformation.","method":"In vitro kinase assay, site-directed mutagenesis (Ser11), K63 ubiquitination assay, transformation assays","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus mutagenesis with functional transformation readout","pmids":["23007157"],"is_preprint":false},{"year":2015,"finding":"TRAF2 constitutively associates with MLKL and suppresses necroptosis; TNFα reverses this via cylindromatosis (CYLD)-dependent TRAF2 deubiquitination; TRAF2 disruption augments RIPK3-MLKL necrosome formation; the C-terminal portion of TRAF2 (not the RING or CIM region) is required for MLKL interaction.","method":"Co-immunoprecipitation, TRAF2 domain deletion mutants, TRAF2 knockout cells and inducible KO mice, RIPK3/MLKL association assays, cell death assays","journal":"Cell Death and Differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, domain mapping, multiple genetic models in vitro and in vivo","pmids":["25882049"],"is_preprint":false},{"year":2015,"finding":"CYLD deubiquitinates TRAF2 (its substrate); disruption of CYLD-TRAF2 interaction in HSCs promotes exit from quiescence and loss of self-renewal via p38MAPK pathway activation (not increased NF-κB), identifying CYLD-TRAF2-p38MAPK as a regulator of HSC dormancy.","method":"Conditional deletion of CYLD catalytic domain, CYLD mutant unable to bind TRAF2, pharmacological p38MAPK inhibition, HSC repopulation assays","journal":"Journal of Experimental Medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis with CYLD binding mutant, pharmacological rescue, in vivo functional assay","pmids":["25824820"],"is_preprint":false},{"year":2004,"finding":"TRAF2 is required for ROS (H₂O₂)-induced cell death in mouse embryonic fibroblasts; TRAF2⁻/⁻ MEFs are resistant to H₂O₂-induced death and cannot be rescued by TNFR1; RIP and TRAF2 form a complex upon H₂O₂ exposure independent of TNFR1; JNK1 activation downstream of RIP-TRAF2 mediates ROS-induced cell death.","method":"TRAF2⁻/⁻ MEFs, RIP⁻/⁻ MEFs, reconstitution of TRAF2 expression, co-immunoprecipitation, JNK activation assays","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO MEFs with reconstitution, receptor-independent Co-IP, multiple KO backgrounds","pmids":["15199146"],"is_preprint":false},{"year":2005,"finding":"TRAF2 is critical for LIGHT-LTβR-mediated NF-κB and JNK activation; TRAF2⁻/⁻ MEFs lack both responses, which are restored by ectopic TRAF2; LIGHT induces recruitment of TRAF2, TRAF3, and IKK into the LTβR complex; unlike TNF signaling, LIGHT-LTβR activation is RIP- and TRAF5-independent.","method":"TRAF2⁻/⁻, RIP⁻/⁻, TRAF5⁻/⁻ MEFs, reconstitution, receptor complex immunoprecipitation, NF-κB and JNK assays","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple KO MEF lines with reconstitution, receptor complex pulldown, pathway epistasis","pmids":["15743811"],"is_preprint":false},{"year":2003,"finding":"Endogenous TRAF2, TRAF3, cIAP1, and Smac associate with the LTβR signaling complex upon LIGHT stimulation, as identified by mass spectrometry and confirmed by co-immunoprecipitation in U937 and HEK293 cells; the presence of cIAP1 and Smac in this complex reveals a mechanism for LIGHT-LTβR-induced apoptosis.","method":"Affinity purification of endogenous complex followed by mass spectrometry; confirmatory co-immunoprecipitation","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — endogenous complex purification by MS and Co-IP, single lab","pmids":["12571250"],"is_preprint":false},{"year":2009,"finding":"MLK3 interacts with TRAF2 (via TRAF domain of TRAF2 and C-terminal half of MLK3) in a TNFα-dependent manner; only TRAF2 (not TRAF5 or TRAF6) significantly induces MLK3 kinase activity; TRAF2 deletion mutant competing for MLK3 binding attenuates MLK3 activity; JNK activation by TNFα is TRAF2-dependent.","method":"Co-immunoprecipitation (endogenous, TNF-dependent), domain deletion mapping, dominant-negative competition, kinase activity assays","journal":"Cell Research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — endogenous Co-IP, domain mapping, competition mutant, single lab","pmids":["19918265"],"is_preprint":false},{"year":2009,"finding":"TNF and IL-1β stimulation induces an interaction between MLK3 and TRAF2 (and TRAF6 for IL-1β); RNAi of traf2 dramatically impairs MLK3 activation by TNF; TNF stimulates K63-linked ubiquitination of MLK3 important for its kinase activity.","method":"RNAi knockdown of TRAF2, Co-immunoprecipitation, ubiquitination assays, MLK3 kinase activity assays","journal":"Cellular Signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi with multiple orthogonal readouts, single lab","pmids":["19586614"],"is_preprint":false},{"year":2014,"finding":"HGK (MAP4K4) directly phosphorylates TRAF2 leading to its lysosomal degradation; HGK deficiency in T cells stabilizes TRAF2 and elevates IL-6 production, promoting Th17 differentiation and insulin resistance.","method":"In vitro phosphorylation assay, conditional T-cell-specific HGK knockout, co-immunoprecipitation, lysosomal degradation assays","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinase assay plus conditional KO mouse model with mechanistic follow-up","pmids":["25098764"],"is_preprint":false},{"year":2004,"finding":"TRAF2 retains cIAP1 and cIAP2 in the cytoplasm by preventing their nuclear translocation; TNFα treatment reduces TRAF2-mediated cytoplasmic retention of cIAP1; co-expression of TRAF2 prevents nuclear accumulation of cIAP1 and cIAP2.","method":"Confocal microscopy, co-expression experiments, leptomycin B treatment, subcellular localization assays","journal":"Experimental Cell Research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — localization by confocal imaging with functional co-expression evidence, single lab","pmids":["15265700"],"is_preprint":false},{"year":2002,"finding":"Cytoplasmic aggregation of TRAF2 and TRAF5 in Hodgkin-Reed-Sternberg cells co-localizes with IKKα, NIK, and IκBα, correlating with constitutive NF-κB activation; dominant-negative TRAF2 and TRAF5 suppress both aggregation and constitutive NF-κB.","method":"Confocal immunofluorescence microscopy, dominant-negative TRAF2 transfection, NF-κB activation assays","journal":"American Journal of Pathology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-localization imaging plus dominant-negative functional data, single lab","pmids":["12000717"],"is_preprint":false},{"year":2015,"finding":"TRAF2-mediated K63-linked ubiquitination of DUSP14 at K103 is required for DUSP14 phosphatase activity during TCR signaling; TRAF2 shRNA reduces DUSP14 ubiquitination.","method":"Mass spectrometry identification of ubiquitination site, K103 mutational analysis, TRAF2 shRNA, phosphatase activity assays","journal":"Cellular Signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS site identification plus mutagenesis and RNAi, single lab","pmids":["26521044"],"is_preprint":false},{"year":2015,"finding":"TRAF2 RING-dependent E3 ubiquitin ligase function is required for TNF-mediated NF-κB and MAP kinase signaling in keratinocytes; keratinocyte-specific TRAF2 deletion (but not SphK1 deficiency) disrupts TNF signaling and causes psoriatic skin inflammation, demonstrating that TRAF2's E3 activity does not require sphingosine-1-phosphate from SphK1.","method":"Keratinocyte-specific Traf2 conditional knockout mouse, comparison with Sphk1-deficient mice, NF-κB and MAP kinase signaling assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO in vivo with direct comparison to SphK1 KO, multiple signaling readouts","pmids":["26701909"],"is_preprint":false},{"year":2017,"finding":"USP48 is a deubiquitinase that removes K48-linked polyubiquitin from TRAF2, stabilizing it specifically in the JNK pathway context; GSK3β phosphorylates USP48, increasing its DUB activity; USP48 knockdown reduces TRAF2 and attenuates TNFα/JNK signaling, increasing E-cadherin expression and epithelial barrier integrity.","method":"Co-immunoprecipitation, K48-ubiquitination assays, GSK3β phosphorylation assay, USP48 knockdown, E-cadherin/barrier assays","journal":"FASEB Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assays and functional pathway data, single lab","pmids":["28874458"],"is_preprint":false},{"year":2019,"finding":"OTUD7b deubiquitinase counteracts K48-linked ubiquitination and proteasomal degradation of TRAF2 in dendritic cells; stabilized TRAF2 facilitates K63-linked polyubiquitination of RIPK1, activating NF-κB and MAP kinases and inducing anti-apoptotic cFLIP/Bcl-xL expression; OTUD7b-deficient mice show DC apoptosis in infection.","method":"Co-immunoprecipitation, ubiquitination assays (K48/K63), DC-specific conditional OTUD7b knockout, murine infection model","journal":"Cell Death & Disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, K48/K63-specific ubiquitination assays, conditional KO with in vivo phenotype","pmids":["37516734"],"is_preprint":false},{"year":2022,"finding":"Doxorubicin causes cIAP1-mediated K48-ubiquitination and proteasomal degradation of TRAF2 in cardiac myocytes; loss of TRAF2 impairs K63-linked polyubiquitination of RIPK1 and NF-κB activation; TRAF2 RING-finger mutant (defective for K63-ubiquitination of RIPK1) fails to restore NF-κB signaling; cardiomyocyte-restricted TRAF2 overexpression in vivo protects against DOX-induced mitochondrial dysfunction and cardiac injury.","method":"In vivo DOX mouse model, iPSC-derived cardiomyocytes, ubiquitination assays, TRAF2 RING-finger mutant, AAV9-mediated cardiac-specific TRAF2 overexpression","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 / Strong — RING-finger mutagenesis plus in vivo AAV rescue model and multiple cellular systems","pmids":["35983756"],"is_preprint":false},{"year":2016,"finding":"Loss of RIPK1 in liver parenchymal cells causes TNF-dependent proteasomal degradation of TRAF2 in a RIPK1 kinase-independent manner, activating caspase-8; combined loss of RIPK1 and TRAF2 in liver causes caspase-8 hyperactivation, impaired NF-κB activation, and spontaneous hepatocellular carcinoma development.","method":"Liver-specific conditional RIPK1 and TRAF2 knockout mice, caspase-8 activity assays, NF-κB assays, tumor development analysis","journal":"Cancer Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — dual conditional KO with clear epistasis, multiple in vivo phenotypes","pmids":["28017612"],"is_preprint":false},{"year":2008,"finding":"Smurf2 is a TRAF2-binding protein identified by yeast two-hybrid; TRAF2 overexpression triggers Smurf2 ubiquitination; Smurf2 promotes TNF-R2 ubiquitination and TNF-R2/TRAF2 relocalization to a detergent-insoluble fraction, enhancing TNF-R2-induced JNK activation without affecting NF-κB.","method":"Yeast two-hybrid screening, co-immunoprecipitation, ubiquitination assays, subcellular fractionation, JNK and NF-κB assays","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid confirmed by Co-IP, ubiquitination and fractionation assays, single lab","pmids":["18671942"],"is_preprint":false},{"year":2015,"finding":"TRAF2 functions as an activator switch for MST1 under oxidative stress: H₂O₂ induces physical interaction between TRAF2 and MST1, promoting MST1 homodimerization and activation; TRAF2 is required for H₂O₂-induced JNK, p38 activation, and apoptosis downstream of MST1.","method":"Co-immunoprecipitation (H₂O₂-dependent), MST1 homodimerization assays, TRAF2 knockdown, kinase activation assays","journal":"Free Radical Biology & Medicine","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus functional knockdown data, single lab","pmids":["26698664"],"is_preprint":false},{"year":1998,"finding":"CDK9 interacts with the conserved TRAF-C domain of TRAF2; endogenous interaction is specific to differentiated tissue; TRAF2-mediated signaling may incorporate CDK9 for cell survival in myotubes.","method":"Yeast two-hybrid screen, domain mapping, endogenous co-immunoprecipitation","journal":"Journal of Cellular Biochemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — yeast two-hybrid confirmed by Co-IP in tissue context, functional consequence speculative","pmids":["9827693"],"is_preprint":false},{"year":2002,"finding":"T2BP (TRAF2 binding protein) interacts with the TRAF domain of TRAF2 (confirmed by co-immunoprecipitation); overexpression of T2BP activates NF-κB and AP-1 in a dose-dependent manner without TNF stimulation.","method":"Mammalian two-hybrid screening, co-immunoprecipitation, NF-κB and AP-1 reporter assays","journal":"Biochemical and Biophysical Research Communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, Co-IP confirmation of two-hybrid, no mechanistic epistasis established","pmids":["11798190"],"is_preprint":false},{"year":2006,"finding":"The KSHV oncoprotein vFLIP contains a TRAF-interacting motif (PYQLT) and directly binds TRAF2 in vitro and in PEL cells; TRAF2 and TRAF3 are required for vFLIP-induced NF-κB activation and cell survival; TRAF2 (not TRAF3) mediates vFLIP association with the IKK complex; P93A/Q95A mutations in vFLIP abolish TRAF2 binding and NF-κB signaling.","method":"In vitro pulldown, co-immunoprecipitation in cells, dominant-negative TRAF2/3, vFLIP point mutants, NF-κB reporter assays","journal":"EMBO Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro pulldown plus Co-IP, mutagenesis of binding motif, TRAF2 dominant-negative, single lab","pmids":["16311516"],"is_preprint":false},{"year":2004,"finding":"PKN1 directly binds the TRAF domain of TRAF2 via a PXQX(S/T) motif (PIQES at residues 580-584); P580A/Q582A mutation abolishes co-immunoprecipitation; PKN1 RNAi downregulates TRAF2-induced NF-κB activation.","method":"Yeast two-hybrid, in vitro binding with TRAF2 deletion mutants, co-immunoprecipitation, PKN1 mutagenesis, RNAi, NF-κB reporter assays","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro domain mapping plus mutagenesis, RNAi with functional readout, single lab","pmids":["14741690"],"is_preprint":false},{"year":2014,"finding":"TRAF2 interacts with the intracellular domain of LILRB3; activated LILRB3 recruits cFLIP via TRAF2, upregulating NF-κB to promote leukemic cell survival; hyperactivation of NF-κB induces A20-mediated negative feedback that disrupts LILRB3-TRAF2 interaction, switching to SHP-1/2-dominant inhibitory signaling.","method":"Co-immunoprecipitation, LILRB3 intracellular domain binding assays, NF-κB activation assays, antagonizing antibodies, functional leukemia models","journal":"Nature Cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional signaling and antibody blockade assays, single lab","pmids":["35122056"],"is_preprint":false},{"year":2021,"finding":"SMYD2 methyltransferase methylates TRAF2 (cytoplasmic protein), stabilizing it by restraining its own proteolysis and enhancing NF-κB signaling activity; the demethylase LSD1 reverses SMYD2-mediated TRAF2 methylation.","method":"Mass spectrometry identification of methylation site, pull-down, immunoprecipitation, methyltransferase assay, ubiquitination assay, luciferase reporter, SMYD2 loss/gain-of-function, in vivo inflammation models","journal":"Clinical and Translational Medicine","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro methyltransferase assay plus multiple orthogonal methods, single lab","pmids":["34841684"],"is_preprint":false},{"year":2023,"finding":"TRAF2 acts as a K63-linked E3 ubiquitin ligase for p62, ubiquitinating it at K420; TRAF2-mediated p62 K63-ubiquitination activates mTORC1 by promoting the p62-mTORC1-Rag complex and lysosomal localization of mTORC1; TRAF2 depletion causes p62 accumulation and suppresses mTORC1 activity and liver cancer cell growth.","method":"Proteomics/Co-immunoprecipitation, K63-ubiquitination assay with K420 mutagenesis, mTORC1 lysosomal localization assays, in vivo tumor models","journal":"Cell Death and Differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus site-directed ubiquitination mutagenesis, in vivo validation, single lab","pmids":["37081115"],"is_preprint":false},{"year":2019,"finding":"UCHL3 deubiquitinase stabilizes TRAF2 by removing K48-linked ubiquitin chains, preventing proteasomal degradation; UCHL3-mediated TRAF2 stabilization activates NF-κB signaling in ovarian cancer.","method":"Co-immunoprecipitation, ubiquitination assays, UCHL3 knockdown, NF-κB luciferase assays, in vivo tumor models","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus ubiquitination assay and functional rescue, single lab","pmids":["31477831"],"is_preprint":false},{"year":2021,"finding":"TRAF2 E3 ubiquitin ligase activity mediates K63-linked ubiquitination of DYRK1A at a PVQE motif-binding site, causing DYRK1A translocation to vesicle membranes; vesicle-localized DYRK1A phosphorylates Sprouty 2, inhibiting EGFR degradation; TRAF2 depletion accelerates EGFR degradation.","method":"Co-immunoprecipitation, K63-ubiquitination assay, subcellular localization by imaging, TRAF2 knockdown, EGFR degradation assays","journal":"Cell Death & Disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, ubiquitination assay with functional localization consequence, single lab","pmids":["34117217"],"is_preprint":false},{"year":2024,"finding":"CD27 recruits TRAF2 and the phosphatase SHP-1 after ligand-induced internalization; the CD27-TRAF2-SHP-1 axis modulates TCR and CD28 signals during naive CD8+ T cell activation to promote memory-associated gene programs over effector differentiation.","method":"Co-immunoprecipitation of CD27-TRAF2-SHP-1 complex post-internalization, CD27 internalization imaging, gene expression profiling, CAR-T cell functional assays","journal":"Immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional gene program and T cell differentiation assays, single lab","pmids":["38354704"],"is_preprint":false},{"year":2017,"finding":"TNFα stimulation induces TRAF2 to recruit GRK2 from the cytoplasm to the cell membrane; the TRAF2-GRK2 complex dissociates at the membrane, allowing GRK2 to desensitize and internalize EP4, reducing intracellular cAMP; TRAF2 siRNA abolishes TRAF2-GRK2 interaction and GRK2 membrane translocation.","method":"Co-immunoprecipitation (TRAF2-GRK2 complex), confocal microscopy for GRK2 translocation, cAMP FRET biosensor, TRAF2 siRNA knockdown","journal":"Acta Pharmacologica Sinica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus live-cell FRET and siRNA with functional receptor signaling readout, single lab","pmids":["33859345"],"is_preprint":false},{"year":2017,"finding":"PKCζ phosphorylates TRAF2 at Ser55 (not Ser11) under intestinal ischemia-reperfusion or hypoxia/reoxygenation conditions; Ser55 phosphorylation promotes NF-κB activation and suppresses c-Jun activation, protecting against intestinal I/R-induced apoptosis.","method":"Co-immunoprecipitation (PKCζ-TRAF2), site-directed mutagenesis (Ser55, Ser11), NF-κB and AP-1 reporter assays, apoptosis assays, in vivo I/R model","journal":"Cell Death & Disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific mutagenesis with in vivo confirmation, multiple signaling readouts, single lab","pmids":["28726782"],"is_preprint":false},{"year":2014,"finding":"PP4R1 (regulatory subunit of protein phosphatase PP4) interacts with TRAF2 in a RING domain-dependent manner; PP4R1 dephosphorylates TRAF2 at Ser11; PP4R1 overexpression inhibits NF-κB activation by TRAF2, TRAF6, TNF, and LMP1; PP4R1 knockdown enhances LMP1 and TNF-induced IL-8 induction.","method":"Yeast two-hybrid, co-immunoprecipitation, RING domain mutagenesis, phosphatase activity assays (Ser11 dephosphorylation), NF-κB reporter assays, RNAi","journal":"Cellular Signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific interaction, phosphatase activity validation, RNAi, single lab","pmids":["25134449"],"is_preprint":false},{"year":2011,"finding":"EBV BRRF1 protein (Na) interacts with TRAF2 in cells (consistent with yeast two-hybrid); TRAF2 is required for Na-induced JNK activation and lytic gene expression in epithelial cells; a JNK inhibitor abolishes Na's ability to disrupt viral latency.","method":"Co-immunoprecipitation in cells, TRAF2 requirement assay (dominant-negative/knockdown), JNK inhibitor, lytic gene expression assays","journal":"Journal of Virology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP plus functional inhibitor and requirement data, single lab","pmids":["21325409"],"is_preprint":false},{"year":2021,"finding":"TRAF2 has an essential role in facilitating physiological mitophagy in cardiac myocytes via its E3 ubiquitin ligase activity; loss of cardiac TRAF2 leads to impaired mitophagy, triggering inflammation and cell death that impairs myocardial homeostasis.","method":"Conditional cardiac TRAF2 knockout, mitophagy assays, inflammatory marker measurements, cardiac phenotype analysis","journal":"JACC Basic to Translational Science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with mitophagy and inflammation functional readouts, single lab","pmids":["35411325"],"is_preprint":false}],"current_model":"TRAF2 is a RING-domain E3 ubiquitin ligase and scaffolding adaptor that is recruited to TNF receptor superfamily members (TNFR1, TNFR2, CD40, LTβR, and others) upon ligand-induced receptor oligomerization, where it activates canonical NF-κB signaling (via IKK recruitment facilitated by PKC-mediated Ser11 phosphorylation and Ubc13-dependent K63-ubiquitination), suppresses alternative NF-κB signaling (by scaffolding cIAP1/2 to ubiquitinate and degrade TRAF3, thereby targeting NIK for degradation), and activates JNK through a sequential TRAF2–ASK1/MLK3–MKK–JNK cascade requiring TRAF2 K63-ubiquitination and translocation to an insoluble cellular fraction; TRAF2 also suppresses necroptosis by associating with MLKL and promoting K63-ubiquitination of RIPK1, regulates mTORC2/mTORC1 balance by K63-ubiquitinating GβL, and its own stability is dynamically controlled by K48-ubiquitination (via cIAP1/Ubc6/cellular context) and deubiquitination (by UCHL3, USP48, and OTUD7b), as well as by phosphorylation from PKC, IKKε, and PKCζ and methylation by SMYD2."},"narrative":{"mechanistic_narrative":"TRAF2 is a trimeric RING-domain E3 ubiquitin ligase and scaffolding adaptor that couples TNF receptor superfamily members to NF-κB and stress-kinase signaling [PMID:7544915, PMID:10206649]. Its TRAF-C domain self-associates into a trimer that recognizes an SXXE-type receptor motif, providing an avidity-based mechanism for recruitment to ligand-oligomerized receptors such as TNF-R2 and CD40 [PMID:10206649], and TRAF2 is required for canonical NF-κB activation downstream of these receptors and of the LIGHT-LTβR axis [PMID:7544915, PMID:15539150, PMID:15743811]. Genetically, TRAF2 is a positive regulator of canonical NF-κB but a negative regulator of the noncanonical pathway: it scaffolds K63-ubiquitination of cIAP1/cIAP2 to drive TRAF3 degradation and thereby keeps NIK destabilized, so its loss abolishes CD40-induced canonical signaling while constitutively activating p100-to-p52 processing [PMID:18997792, PMID:15539150]. TRAF2 separately drives JNK activation through a TRAF2–ASK1/MLK3 kinase cascade that requires Ubc13-dependent K63-ubiquitination of TRAF2 and its translocation to a detergent-insoluble compartment [PMID:9774977, PMID:14713952, PMID:19918265]. Beyond receptor signaling, TRAF2's catalytic activity targets diverse substrates: it K63-ubiquitinates GβL (MLST8) to bias mTORC1 over mTORC2 formation [PMID:28489822] and ubiquitinates RIPK1 to suppress necroptotic and apoptotic cell death while restraining the MLKL necrosome [PMID:25882049, PMID:35983756]. TRAF2 abundance is itself a tightly regulated signaling node, set by K48-linked ubiquitination and proteasomal degradation by cIAP1 (with the ER E2 Ubc6) and opposed by the deubiquitinases CYLD, USP48, UCHL3, and OTUD7b, as well as by phosphorylation (PKC, IKKε at Ser11) and SMYD2 methylation [PMID:11907583, PMID:19150425, PMID:15861135, PMID:23007157, PMID:37516734, PMID:31477831]. In vivo, conditional deletion links TRAF2 to epithelial inflammation, hepatocellular carcinoma, and cardiac homeostasis [PMID:26701909, PMID:28017612, PMID:35983756].","teleology":[{"year":1995,"claim":"Established TRAF2 as a shared signaling mediator by showing it is necessary and sufficient for receptor-driven NF-κB activation.","evidence":"Overexpression and RING-deleted dominant-negative analysis with NF-κB reporters across TNF-R2 and CD40","pmids":["7544915"],"confidence":"High","gaps":["Endogenous requirement not yet shown genetically","RING-domain enzymatic activity not yet defined"]},{"year":1998,"claim":"Defined the TRAF2–ASK1 link that routes TNF signaling into the JNK arm distinct from NF-κB.","evidence":"TNF-dependent reciprocal Co-IP plus catalytically inactive ASK1 dominant-negative and JNK assays","pmids":["9774977"],"confidence":"High","gaps":["How TRAF2 activates ASK1 mechanistically not resolved","Role of TRAF2 ubiquitination not yet implicated"]},{"year":1999,"claim":"Provided the structural basis for receptor-oligomerization-dependent recruitment by showing TRAF2 trimerizes and binds an SXXE consensus motif.","evidence":"X-ray crystallography of the TRAF domain alone and bound to TNF-R2 peptide with solution validation","pmids":["10206649"],"confidence":"High","gaps":["Structure of full-length protein with RING domain not solved","Conformational changes on activation not captured"]},{"year":1999,"claim":"Identified TRAF2-associated kinase complexes (TANK/TBK1) acting upstream of the IKK complex in NF-κB activation.","evidence":"Co-IP of ternary complex with kinase-dead TBK1 dominant-negative and NF-κB reporters","pmids":["10581243"],"confidence":"High","gaps":["Physiological stimulus engaging this complex not defined","Endogenous requirement not tested genetically"]},{"year":2002,"claim":"Revealed that TRAF2 stability is actively controlled by cIAP1-mediated K48-ubiquitination, linking its turnover to apoptotic outcome.","evidence":"In vitro ubiquitination with E3-defective cIAP1 mutant, proteasome inhibitor and Co-IP in cells","pmids":["11907583"],"confidence":"High","gaps":["Cognate E2 not identified at this stage","Subcellular site of degradation not localized"]},{"year":2004,"claim":"Separated TRAF2's roles using clean genetics, defining it as a positive regulator of canonical and a negative regulator of noncanonical NF-κB.","evidence":"B-cell-specific conditional knockout with NF-κB DNA-binding and proliferation assays","pmids":["15539150"],"confidence":"High","gaps":["Molecular mechanism of noncanonical suppression not yet defined (resolved later)"]},{"year":2004,"claim":"Extended TRAF2 function to receptor-independent oxidative stress death via a RIP–TRAF2–JNK1 axis.","evidence":"TRAF2−/− and RIP−/− MEFs with reconstitution and H2O2-induced Co-IP and JNK assays","pmids":["15199146"],"confidence":"High","gaps":["Sensor of ROS upstream of TRAF2-RIP complex unknown"]},{"year":2004,"claim":"Identified TRAF2-bound regulators (PKN1) and a cytoplasmic-retention role for cIAP1/2, expanding the adaptor interactome.","evidence":"Yeast two-hybrid, domain-mapped binding, RNAi/NF-κB assays and confocal localization","pmids":["14741690","15265700"],"confidence":"Medium","gaps":["Single-lab interactions without independent confirmation","Physiological relevance of cIAP retention untested in vivo"]},{"year":2004,"claim":"Demonstrated that TRAF2 ubiquitination via its RING/zinc-finger and Ubc13 selectively drives JNK, not NF-κB or p38, coupled to insoluble-fraction translocation.","evidence":"Ubc13 RNAi, RING mutagenesis, subcellular fractionation with parallel pathway readouts","pmids":["14713952"],"confidence":"High","gaps":["Identity of K63 chain attachment site not pinpointed here","Nature of insoluble compartment not defined"]},{"year":2005,"claim":"Localized cIAP1-mediated TRAF2 degradation to an ER-associated perinuclear compartment using the E2 Ubc6.","evidence":"Confocal ER co-localization, in vitro E2/E3 reconstitution and dominant-negative Ubc6","pmids":["15861135"],"confidence":"High","gaps":["Trigger for ER translocation not defined","Single-study reconstitution"]},{"year":2005,"claim":"Distinguished LIGHT-LTβR signaling from TNFR1 by showing TRAF2 dependence but RIP- and TRAF5-independence.","evidence":"Multiple KO MEF lines with reconstitution and receptor complex immunoprecipitation","pmids":["15743811","12571250"],"confidence":"High","gaps":["Apoptotic versus survival output balance not fully resolved"]},{"year":2008,"claim":"Resolved the mechanism of noncanonical suppression: TRAF2 K63-ubiquitinates cIAP1/2 to license TRAF3 degradation and NIK stabilization.","evidence":"Genetic deletion models with biochemical reconstitution and ubiquitination assays","pmids":["18997792"],"confidence":"High","gaps":["Stoichiometry of the cIAP-TRAF2-TRAF3 complex addressed structurally only later"]},{"year":2009,"claim":"Defined the phosphorylation-to-ubiquitination relay: PKC-phosphorylated TRAF2 undergoes K63-ubiquitination at Lys31 to recruit IKK and TAB2/3.","evidence":"In vitro kinase assay, K31 mutagenesis, Co-IP and ubiquitination assays","pmids":["19150425"],"confidence":"High","gaps":["Specific PKC isoform and kinase regulation not exhaustively mapped"]},{"year":2009,"claim":"Placed MLK3 as a TRAF2-specific JNK-pathway effector activated by K63-ubiquitination.","evidence":"TNF-dependent Co-IP, domain mapping, RNAi and MLK3 kinase activity assays","pmids":["19918265","19586614"],"confidence":"Medium","gaps":["Single-lab findings","Whether MLK3 and ASK1 act redundantly or sequentially not resolved"]},{"year":2010,"claim":"Provided the structural stoichiometry of the TRAF2/cIAP2 and TRAF1:TRAF2:cIAP2 complexes, explaining how TRAF1 modulates cIAP recruitment.","evidence":"X-ray crystallography with interface mutagenesis and solution binding","pmids":["20385093"],"confidence":"High","gaps":["Functional consequence of TRAF1 heterotrimer in vivo not fully tested"]},{"year":2012,"claim":"Identified IKKε phosphorylation of TRAF2 at Ser11 as an oncogenic driver promoting K63-ubiquitination and NF-κB.","evidence":"In vitro kinase assay, Ser11 mutagenesis, K63 ubiquitination and transformation assays","pmids":["23007157"],"confidence":"High","gaps":["Crosstalk between Ser11 and Lys31 modifications not dissected"]},{"year":2014,"claim":"Showed TRAF2 abundance is set by kinase-directed lysosomal degradation (HGK/MAP4K4) with consequences for T-cell cytokine programs.","evidence":"In vitro kinase assay and T-cell-specific conditional HGK knockout","pmids":["25098764"],"confidence":"High","gaps":["Lysosomal versus proteasomal routing determinants unclear"]},{"year":2015,"claim":"Established TRAF2 as a constitutive necroptosis brake via MLKL binding and CYLD-controlled deubiquitination, and linked CYLD-TRAF2 to HSC quiescence through p38MAPK.","evidence":"Domain-mapped Co-IP, KO cells/mice, necrosome assays; CYLD-binding mutant and p38 inhibition in HSCs","pmids":["25882049","25824820"],"confidence":"High","gaps":["How MLKL binding gates necrosome assembly mechanistically not fully defined"]},{"year":2015,"claim":"Demonstrated in vivo that TRAF2 RING-dependent E3 activity, not SphK1-derived S1P, drives TNF signaling in epithelium.","evidence":"Keratinocyte-specific Traf2 KO compared with Sphk1-deficient mice and signaling readouts","pmids":["26701909"],"confidence":"High","gaps":["Reconciliation with earlier SphK-dependence claims not fully addressed"]},{"year":2017,"claim":"Expanded TRAF2 catalysis beyond immunity to metabolic control by K63-ubiquitinating GβL to bias mTORC1 over mTORC2, reversed by OTUD7b.","evidence":"In vitro ubiquitination, GβL site mutagenesis, Co-IP and genetic deletion in mice","pmids":["28489822"],"confidence":"High","gaps":["How signaling stimuli toggle this ubiquitination not defined"]},{"year":2017,"claim":"Identified additional deubiquitinases and phosphatases (USP48, PKCζ/Ser55, PP4R1) that fine-tune TRAF2 stability and output.","evidence":"Co-IP, K48-ubiquitination and phosphatase assays, site mutagenesis with pathway readouts","pmids":["28874458","28726782","25134449"],"confidence":"Medium","gaps":["Single-lab studies","Context specificity of each regulator not cross-validated"]},{"year":2019,"claim":"Showed UCHL3 and OTUD7b stabilize TRAF2 by removing K48 chains, enabling RIPK1 K63-ubiquitination and survival signaling in cancer and DCs.","evidence":"Co-IP, K48/K63-specific ubiquitination assays, conditional KO and tumor/infection models","pmids":["31477831","37516734"],"confidence":"High","gaps":["Which DUB dominates in a given cell type unresolved"]},{"year":2022,"claim":"Connected TRAF2 degradation to cardiac injury: doxorubicin-driven cIAP1-mediated TRAF2 loss impairs RIPK1 ubiquitination and NF-κB, with RING-dependent rescue in vivo.","evidence":"DOX mouse model, iPSC-cardiomyocytes, RING mutant and AAV9 cardiac overexpression","pmids":["35983756"],"confidence":"High","gaps":["Mitochondrial protective mechanism downstream of NF-κB not fully delineated"]},{"year":2023,"claim":"Identified new K63 substrates (p62, DYRK1A) linking TRAF2 to mTORC1 activation and EGFR trafficking in cancer.","evidence":"Proteomics/Co-IP with site-directed ubiquitination mutagenesis and in vivo tumor models","pmids":["37081115","34117217"],"confidence":"Medium","gaps":["Single-lab substrate assignments","Selectivity among TRAF2 substrates not explained"]},{"year":null,"claim":"How TRAF2 selects among its many K63 substrates and how the competing K48-degradative versus K63-signaling fates are coordinated in a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model integrating phosphorylation, methylation and DUB inputs onto substrate choice","Quantitative dynamics of TRAF2 pools across compartments unmeasured"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[6,7,8,10,30,40]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[7,10,30,40,42]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2,3,19]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[16,33,44]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[24,39,44]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[13]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[8,44]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,8,11,19]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[7,11,29,43]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[5,16,18,31]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[5,7,10,29,41]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[10,40]}],"complexes":["TRAF2:cIAP1/cIAP2","TRAF1:TRAF2:cIAP2","TRAF2:TANK:TBK1","LTβR signaling complex"],"partners":["CIAP1","CIAP2","TRAF3","ASK1","MLK3","MLKL","RIPK1","CYLD"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q92844","full_name":"TRAF family member-associated NF-kappa-B activator","aliases":["TRAF-interacting protein","I-TRAF"],"length_aa":425,"mass_kda":47.8,"function":"Adapter protein involved in I-kappa-B-kinase (IKK) regulation which constitutively binds TBK1 and IKBKE playing a role in antiviral innate immunity. Acts as a regulator of TRAF function by maintaining them in a latent state. Blocks TRAF2 binding to LMP1 and inhibits LMP1-mediated NF-kappa-B activation. Negatively regulates NF-kappaB signaling and cell survival upon DNA damage (PubMed:25861989). Plays a role as an adapter to assemble ZC3H12A, USP10 in a deubiquitination complex which plays a negative feedback response to attenuate NF-kappaB activation through the deubiquitination of IKBKG or TRAF6 in response to interleukin-1-beta (IL1B) stimulation or upon DNA damage (PubMed:25861989). Promotes UBP10-induced deubiquitination of TRAF6 in response to DNA damage (PubMed:25861989). May control negatively TRAF2-mediated NF-kappa-B activation signaled by CD40, TNFR1 and TNFR2","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q92844/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRAF2","classification":"Not Classified","n_dependent_lines":329,"n_total_lines":1208,"dependency_fraction":0.2723509933774834},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HNRNPH1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TRAF2","total_profiled":1310},"omim":[{"mim_id":"621115","title":"RIB43A DOMAIN WITH COILED-COILS PROTEIN 2; RIBC2","url":"https://www.omim.org/entry/621115"},{"mim_id":"621096","title":"IMMUNODEFICIENCY 132B; IMD132B","url":"https://www.omim.org/entry/621096"},{"mim_id":"620336","title":"ZINC FINGER SWIM DOMAIN-CONTAINING PROTEIN 3; ZSWIM3","url":"https://www.omim.org/entry/620336"},{"mim_id":"619704","title":"ZINC FINGER CCCH DOMAIN-CONTAINING PROTEIN 15; ZC3H15","url":"https://www.omim.org/entry/619704"},{"mim_id":"618740","title":"COILED-COIL DOMAIN-CONTAINING PROTEIN 154; CCDC154","url":"https://www.omim.org/entry/618740"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Cytosol","reliability":"Enhanced"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TRAF2"},"hgnc":{"alias_symbol":["TRAP3","RNF117"],"prev_symbol":[]},"alphafold":{"accession":"Q92844","domains":[{"cath_id":"-","chopping":"393-425","consensus_level":"medium","plddt":80.5939,"start":393,"end":425},{"cath_id":"1.20.5","chopping":"2-67","consensus_level":"medium","plddt":95.7268,"start":2,"end":67}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92844","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q92844-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q92844-F1-predicted_aligned_error_v6.png","plddt_mean":59.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TRAF2","jax_strain_url":"https://www.jax.org/strain/search?query=TRAF2"},"sequence":{"accession":"Q92844","fasta_url":"https://rest.uniprot.org/uniprotkb/Q92844.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q92844/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92844"}},"corpus_meta":[{"pmid":"7544915","id":"PMC_7544915","title":"TRAF2-mediated activation of NF-kappa B by TNF receptor 2 and CD40.","date":"1995","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/7544915","citation_count":939,"is_preprint":false},{"pmid":"9774977","id":"PMC_9774977","title":"ASK1 is essential for JNK/SAPK activation by TRAF2.","date":"1998","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/9774977","citation_count":557,"is_preprint":false},{"pmid":"18997792","id":"PMC_18997792","title":"Nonredundant and complementary functions of TRAF2 and TRAF3 in a ubiquitination cascade that activates NIK-dependent alternative NF-kappaB signaling.","date":"2008","source":"Nature immunology","url":"https://pubmed.ncbi.nlm.nih.gov/18997792","citation_count":524,"is_preprint":false},{"pmid":"10581243","id":"PMC_10581243","title":"NF-kappaB activation by a signaling complex containing TRAF2, TANK and TBK1, a novel IKK-related kinase.","date":"1999","source":"The EMBO 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S-transferase P1-1 interacts with TRAF2 and regulates TRAF2-ASK1 signals.","date":"2006","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/16636664","citation_count":186,"is_preprint":false},{"pmid":"14713952","id":"PMC_14713952","title":"Ubiquitination and translocation of TRAF2 is required for activation of JNK but not of p38 or NF-kappaB.","date":"2004","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/14713952","citation_count":179,"is_preprint":false},{"pmid":"15539150","id":"PMC_15539150","title":"TRAF2 differentially regulates the canonical and noncanonical pathways of NF-kappaB activation in mature B cells.","date":"2004","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/15539150","citation_count":179,"is_preprint":false},{"pmid":"20385093","id":"PMC_20385093","title":"Crystal structures of the TRAF2: cIAP2 and the TRAF1: TRAF2: cIAP2 complexes: affinity, specificity, and regulation.","date":"2010","source":"Molecular 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a common mediator of TNF-R2 and CD40 signaling to NF-κB.\",\n      \"method\": \"Overexpression and dominant-negative mutant analysis in transfected cells; NF-κB reporter assays\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — dominant-negative mutagenesis with functional readout, replicated across multiple receptor systems, foundational paper widely confirmed\",\n      \"pmids\": [\"7544915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"ASK1 physically interacts with TRAF2 in a TNF-dependent manner and is activated by TRAF2 overexpression; a catalytically inactive ASK1 mutant blocks TRAF2-induced JNK activation, placing ASK1 downstream of TRAF2 in TNF-induced JNK signaling.\",\n      \"method\": \"Co-immunoprecipitation (endogenous, TNF-dependent), overexpression, dominant-negative kinase mutant, JNK activation assays\",\n      \"journal\": \"Molecular Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus dominant-negative kinase mutagenesis with clear pathway epistasis\",\n      \"pmids\": [\"9774977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"TRAF2 forms a ternary signaling complex with TANK and TBK1 (a novel IKK-related kinase) that functions upstream of NIK and the IKK complex to activate NF-κB; complex formation is required for TBK1 kinase activity.\",\n      \"method\": \"Co-immunoprecipitation, kinase-dead TBK1 dominant-negative, NF-κB reporter assays\",\n      \"journal\": \"EMBO Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ternary complex demonstrated by Co-IP, kinase-dead dominant-negative validates requirement, multiple orthogonal methods\",\n      \"pmids\": [\"10581243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Crystal structure of the TRAF2 TRAF domain reveals a trimeric self-association; the TRAF-C domain forms an eight-stranded antiparallel β-sandwich; TNF-R2 peptide binds a conserved shallow surface depression on one TRAF-C protomer; an SXXE motif is identified as a TRAF2-binding consensus sequence; trimeric structure provides avidity-based mechanism for receptor-oligomerization-dependent TRAF recruitment.\",\n      \"method\": \"X-ray crystallography (TRAF domain alone and in complex with TNF-R2 peptide), solution studies confirming trimeric assembly\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional validation and solution studies; foundational structural paper\",\n      \"pmids\": [\"10206649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"A20 interacts with TRAF1 and TRAF2 through its N-terminal domain binding to the conserved TRAF-C domain, and its C-terminal zinc finger domain mediates inhibition of TRAF2-induced NF-κB activation, defining a negative feedback loop.\",\n      \"method\": \"Co-immunoprecipitation, mutational analysis, co-transfection NF-κB reporter assays\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal domain-mapping mutagenesis plus functional NF-κB inhibition assays, replicated\",\n      \"pmids\": [\"8692885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TNF-RII engagement induces ubiquitination and proteasomal degradation of TRAF2 by c-IAP1, which binds TRAF2 in vitro and acts as an E3 ubiquitin ligase; an E3-defective c-IAP1 mutant prevents TRAF2 degradation and inhibits TNF-induced apoptosis.\",\n      \"method\": \"In vitro ubiquitination assay, E3-defective mutant, co-immunoprecipitation, proteasome inhibitor experiments\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro ubiquitination assay with E3-defective mutant, physiological confirmation in cells\",\n      \"pmids\": [\"11907583\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TRAF2 ubiquitination via its RING and zinc finger domains, dependent on the E2 enzyme Ubc13, is required for TNFα-induced JNK activation but not for p38 or NF-κB activation; TRAF2 ubiquitination coincides with translocation to the insoluble cellular fraction.\",\n      \"method\": \"RNAi knockdown of Ubc13, RING domain mutagenesis, subcellular fractionation, JNK/IKK/p38 activation assays\",\n      \"journal\": \"EMBO Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RING mutagenesis plus RNAi with multiple pathway readouts and fractionation in single study\",\n      \"pmids\": [\"14713952\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TRAF2 mediates K63-linked ubiquitination of cIAP1 and cIAP2, activating their E3 ubiquitin ligase activity toward TRAF3; upon CD40 or BAFF-R activation, cIAP1/2 ubiquitinate TRAF3 for degradation, releasing NIK from the cIAP1-cIAP2-TRAF2 complex, leading to NIK stabilization and NF-κB2-p100 processing (alternative NF-κB pathway).\",\n      \"method\": \"Genetic deletion models, ubiquitination assays, biochemical reconstitution of complex, immunoprecipitation\",\n      \"journal\": \"Nature Immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models plus biochemical ubiquitination assays, replicated concept across labs\",\n      \"pmids\": [\"18997792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PKC kinases phosphorylate TRAF2, facilitating recruitment of IKKα and IKKβ to the TNF receptor; phosphorylated TRAF2 undergoes K63-linked polyubiquitination at lysine 31, promoting TAB2/3 association and downstream IKK and JNK activation.\",\n      \"method\": \"In vitro phosphorylation assays, site-directed mutagenesis (K31), co-immunoprecipitation, ubiquitination assays\",\n      \"journal\": \"Molecular Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus mutagenesis of phosphorylation and ubiquitination sites with functional pathway readouts\",\n      \"pmids\": [\"19150425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Crystal structures of the TRAF2:cIAP2 and TRAF1:TRAF2:cIAP2 complexes show a TRAF2 trimer interacts with one cIAP2, with two chains of the TRAF2 trimer directly contacting cIAP2; TRAF1 preferentially forms a TRAF1:(TRAF2)₂ heterotrimer that binds cIAP2 more strongly, suggesting TRAF1 upregulation modulates TRAF2-cIAP1/2 interactions in TNF signaling.\",\n      \"method\": \"X-ray crystallography, mutagenesis of interface residues, solution binding studies\",\n      \"journal\": \"Molecular Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structures with interface mutagenesis and solution validation\",\n      \"pmids\": [\"20385093\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TRAF2 acts as an E3 ubiquitin ligase that promotes K63-linked polyubiquitination of GβL (MLST8), disrupting its interaction with the mTORC2-specific component SIN1 to favor mTORC1 formation over mTORC2; the deubiquitinase OTUD7B reverses this to promote mTORC2 assembly.\",\n      \"method\": \"In vitro ubiquitination assay, Co-immunoprecipitation, mutagenesis of GβL ubiquitination sites (K305R/K313R), genetic deletion in mice\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro ubiquitination, mutagenesis, and in vivo genetic validation in multiple experimental systems\",\n      \"pmids\": [\"28489822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In B cells lacking TRAF2, canonical NF-κB activation by CD40 ligation is abolished while noncanonical NF-κB (p100-to-p52 processing, RelB) is constitutively hyperactive, establishing TRAF2 as a positive regulator of canonical and negative regulator of noncanonical NF-κB.\",\n      \"method\": \"Conditional knockout mouse (B cell-specific TRAF2 deletion), NF-κB DNA binding assays, functional B cell proliferation assays\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean conditional KO with multiple orthogonal NF-κB pathway readouts\",\n      \"pmids\": [\"15539150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Sphingosine kinase (SphK) associates with TRAF2 via a TRAF2-binding motif, and this interaction activates SphK, which is required for TRAF2-mediated NF-κB activation and antiapoptotic signaling but not for JNK activation; dominant-negative SphK or SphK lacking the TRAF2-binding motif blocks NF-κB but not JNK.\",\n      \"method\": \"Co-immunoprecipitation, dominant-negative and binding-motif mutant SphK, NF-κB and JNK activation assays, apoptosis assays\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus domain mutagenesis and functional readouts, single lab\",\n      \"pmids\": [\"11777919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Upon TNF-R2 signaling, TRAF2 and c-IAP1 translocate to a perinuclear, Triton X-100-insoluble compartment that co-localizes with the ER; the ER-resident E2 enzyme Ubc6 binds c-IAP1 and acts as a cognate E2 for c-IAP1-mediated TRAF2 ubiquitination in this compartment; catalytically inactive Ubc6 inhibits TNF-R2-dependent TRAF2 degradation.\",\n      \"method\": \"Confocal microscopy with ER markers, in vitro E2/E3 ubiquitination assay, dominant-negative Ubc6 mutant, subcellular fractionation\",\n      \"journal\": \"EMBO Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro ubiquitination reconstitution, localization by confocal microscopy, and dominant-negative confirmation in a single study\",\n      \"pmids\": [\"15861135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"GSTP1-1 physically associates with TRAF2 in vivo and in vitro via the TRAF domain-binding motif; GSTP1-1 overexpression inhibits TRAF2-induced JNK and p38 (but not NF-κB) activation by suppressing TRAF2-ASK1 interaction; GSTP1-1 RNAi increases TRAF2-ASK1 association and hyper-activates ASK1 and JNK.\",\n      \"method\": \"Co-immunoprecipitation (in vivo and in vitro), GSTP1-1 mutant lacking TRAF domain-binding motif, RNAi, kinase activation assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus domain-mapping mutant and RNAi, single lab\",\n      \"pmids\": [\"16636664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"IKKε phosphorylates TRAF2 at Ser11 in vitro and in vivo; this phosphorylation promotes K63-linked TRAF2 ubiquitination and NF-κB activation, and is essential for IKKε-driven mammary epithelial cell transformation.\",\n      \"method\": \"In vitro kinase assay, site-directed mutagenesis (Ser11), K63 ubiquitination assay, transformation assays\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus mutagenesis with functional transformation readout\",\n      \"pmids\": [\"23007157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRAF2 constitutively associates with MLKL and suppresses necroptosis; TNFα reverses this via cylindromatosis (CYLD)-dependent TRAF2 deubiquitination; TRAF2 disruption augments RIPK3-MLKL necrosome formation; the C-terminal portion of TRAF2 (not the RING or CIM region) is required for MLKL interaction.\",\n      \"method\": \"Co-immunoprecipitation, TRAF2 domain deletion mutants, TRAF2 knockout cells and inducible KO mice, RIPK3/MLKL association assays, cell death assays\",\n      \"journal\": \"Cell Death and Differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, domain mapping, multiple genetic models in vitro and in vivo\",\n      \"pmids\": [\"25882049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CYLD deubiquitinates TRAF2 (its substrate); disruption of CYLD-TRAF2 interaction in HSCs promotes exit from quiescence and loss of self-renewal via p38MAPK pathway activation (not increased NF-κB), identifying CYLD-TRAF2-p38MAPK as a regulator of HSC dormancy.\",\n      \"method\": \"Conditional deletion of CYLD catalytic domain, CYLD mutant unable to bind TRAF2, pharmacological p38MAPK inhibition, HSC repopulation assays\",\n      \"journal\": \"Journal of Experimental Medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis with CYLD binding mutant, pharmacological rescue, in vivo functional assay\",\n      \"pmids\": [\"25824820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TRAF2 is required for ROS (H₂O₂)-induced cell death in mouse embryonic fibroblasts; TRAF2⁻/⁻ MEFs are resistant to H₂O₂-induced death and cannot be rescued by TNFR1; RIP and TRAF2 form a complex upon H₂O₂ exposure independent of TNFR1; JNK1 activation downstream of RIP-TRAF2 mediates ROS-induced cell death.\",\n      \"method\": \"TRAF2⁻/⁻ MEFs, RIP⁻/⁻ MEFs, reconstitution of TRAF2 expression, co-immunoprecipitation, JNK activation assays\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO MEFs with reconstitution, receptor-independent Co-IP, multiple KO backgrounds\",\n      \"pmids\": [\"15199146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TRAF2 is critical for LIGHT-LTβR-mediated NF-κB and JNK activation; TRAF2⁻/⁻ MEFs lack both responses, which are restored by ectopic TRAF2; LIGHT induces recruitment of TRAF2, TRAF3, and IKK into the LTβR complex; unlike TNF signaling, LIGHT-LTβR activation is RIP- and TRAF5-independent.\",\n      \"method\": \"TRAF2⁻/⁻, RIP⁻/⁻, TRAF5⁻/⁻ MEFs, reconstitution, receptor complex immunoprecipitation, NF-κB and JNK assays\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple KO MEF lines with reconstitution, receptor complex pulldown, pathway epistasis\",\n      \"pmids\": [\"15743811\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Endogenous TRAF2, TRAF3, cIAP1, and Smac associate with the LTβR signaling complex upon LIGHT stimulation, as identified by mass spectrometry and confirmed by co-immunoprecipitation in U937 and HEK293 cells; the presence of cIAP1 and Smac in this complex reveals a mechanism for LIGHT-LTβR-induced apoptosis.\",\n      \"method\": \"Affinity purification of endogenous complex followed by mass spectrometry; confirmatory co-immunoprecipitation\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — endogenous complex purification by MS and Co-IP, single lab\",\n      \"pmids\": [\"12571250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MLK3 interacts with TRAF2 (via TRAF domain of TRAF2 and C-terminal half of MLK3) in a TNFα-dependent manner; only TRAF2 (not TRAF5 or TRAF6) significantly induces MLK3 kinase activity; TRAF2 deletion mutant competing for MLK3 binding attenuates MLK3 activity; JNK activation by TNFα is TRAF2-dependent.\",\n      \"method\": \"Co-immunoprecipitation (endogenous, TNF-dependent), domain deletion mapping, dominant-negative competition, kinase activity assays\",\n      \"journal\": \"Cell Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — endogenous Co-IP, domain mapping, competition mutant, single lab\",\n      \"pmids\": [\"19918265\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TNF and IL-1β stimulation induces an interaction between MLK3 and TRAF2 (and TRAF6 for IL-1β); RNAi of traf2 dramatically impairs MLK3 activation by TNF; TNF stimulates K63-linked ubiquitination of MLK3 important for its kinase activity.\",\n      \"method\": \"RNAi knockdown of TRAF2, Co-immunoprecipitation, ubiquitination assays, MLK3 kinase activity assays\",\n      \"journal\": \"Cellular Signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi with multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"19586614\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HGK (MAP4K4) directly phosphorylates TRAF2 leading to its lysosomal degradation; HGK deficiency in T cells stabilizes TRAF2 and elevates IL-6 production, promoting Th17 differentiation and insulin resistance.\",\n      \"method\": \"In vitro phosphorylation assay, conditional T-cell-specific HGK knockout, co-immunoprecipitation, lysosomal degradation assays\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinase assay plus conditional KO mouse model with mechanistic follow-up\",\n      \"pmids\": [\"25098764\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"TRAF2 retains cIAP1 and cIAP2 in the cytoplasm by preventing their nuclear translocation; TNFα treatment reduces TRAF2-mediated cytoplasmic retention of cIAP1; co-expression of TRAF2 prevents nuclear accumulation of cIAP1 and cIAP2.\",\n      \"method\": \"Confocal microscopy, co-expression experiments, leptomycin B treatment, subcellular localization assays\",\n      \"journal\": \"Experimental Cell Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — localization by confocal imaging with functional co-expression evidence, single lab\",\n      \"pmids\": [\"15265700\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Cytoplasmic aggregation of TRAF2 and TRAF5 in Hodgkin-Reed-Sternberg cells co-localizes with IKKα, NIK, and IκBα, correlating with constitutive NF-κB activation; dominant-negative TRAF2 and TRAF5 suppress both aggregation and constitutive NF-κB.\",\n      \"method\": \"Confocal immunofluorescence microscopy, dominant-negative TRAF2 transfection, NF-κB activation assays\",\n      \"journal\": \"American Journal of Pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-localization imaging plus dominant-negative functional data, single lab\",\n      \"pmids\": [\"12000717\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRAF2-mediated K63-linked ubiquitination of DUSP14 at K103 is required for DUSP14 phosphatase activity during TCR signaling; TRAF2 shRNA reduces DUSP14 ubiquitination.\",\n      \"method\": \"Mass spectrometry identification of ubiquitination site, K103 mutational analysis, TRAF2 shRNA, phosphatase activity assays\",\n      \"journal\": \"Cellular Signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS site identification plus mutagenesis and RNAi, single lab\",\n      \"pmids\": [\"26521044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRAF2 RING-dependent E3 ubiquitin ligase function is required for TNF-mediated NF-κB and MAP kinase signaling in keratinocytes; keratinocyte-specific TRAF2 deletion (but not SphK1 deficiency) disrupts TNF signaling and causes psoriatic skin inflammation, demonstrating that TRAF2's E3 activity does not require sphingosine-1-phosphate from SphK1.\",\n      \"method\": \"Keratinocyte-specific Traf2 conditional knockout mouse, comparison with Sphk1-deficient mice, NF-κB and MAP kinase signaling assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO in vivo with direct comparison to SphK1 KO, multiple signaling readouts\",\n      \"pmids\": [\"26701909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"USP48 is a deubiquitinase that removes K48-linked polyubiquitin from TRAF2, stabilizing it specifically in the JNK pathway context; GSK3β phosphorylates USP48, increasing its DUB activity; USP48 knockdown reduces TRAF2 and attenuates TNFα/JNK signaling, increasing E-cadherin expression and epithelial barrier integrity.\",\n      \"method\": \"Co-immunoprecipitation, K48-ubiquitination assays, GSK3β phosphorylation assay, USP48 knockdown, E-cadherin/barrier assays\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assays and functional pathway data, single lab\",\n      \"pmids\": [\"28874458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"OTUD7b deubiquitinase counteracts K48-linked ubiquitination and proteasomal degradation of TRAF2 in dendritic cells; stabilized TRAF2 facilitates K63-linked polyubiquitination of RIPK1, activating NF-κB and MAP kinases and inducing anti-apoptotic cFLIP/Bcl-xL expression; OTUD7b-deficient mice show DC apoptosis in infection.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays (K48/K63), DC-specific conditional OTUD7b knockout, murine infection model\",\n      \"journal\": \"Cell Death & Disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, K48/K63-specific ubiquitination assays, conditional KO with in vivo phenotype\",\n      \"pmids\": [\"37516734\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Doxorubicin causes cIAP1-mediated K48-ubiquitination and proteasomal degradation of TRAF2 in cardiac myocytes; loss of TRAF2 impairs K63-linked polyubiquitination of RIPK1 and NF-κB activation; TRAF2 RING-finger mutant (defective for K63-ubiquitination of RIPK1) fails to restore NF-κB signaling; cardiomyocyte-restricted TRAF2 overexpression in vivo protects against DOX-induced mitochondrial dysfunction and cardiac injury.\",\n      \"method\": \"In vivo DOX mouse model, iPSC-derived cardiomyocytes, ubiquitination assays, TRAF2 RING-finger mutant, AAV9-mediated cardiac-specific TRAF2 overexpression\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RING-finger mutagenesis plus in vivo AAV rescue model and multiple cellular systems\",\n      \"pmids\": [\"35983756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Loss of RIPK1 in liver parenchymal cells causes TNF-dependent proteasomal degradation of TRAF2 in a RIPK1 kinase-independent manner, activating caspase-8; combined loss of RIPK1 and TRAF2 in liver causes caspase-8 hyperactivation, impaired NF-κB activation, and spontaneous hepatocellular carcinoma development.\",\n      \"method\": \"Liver-specific conditional RIPK1 and TRAF2 knockout mice, caspase-8 activity assays, NF-κB assays, tumor development analysis\",\n      \"journal\": \"Cancer Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — dual conditional KO with clear epistasis, multiple in vivo phenotypes\",\n      \"pmids\": [\"28017612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Smurf2 is a TRAF2-binding protein identified by yeast two-hybrid; TRAF2 overexpression triggers Smurf2 ubiquitination; Smurf2 promotes TNF-R2 ubiquitination and TNF-R2/TRAF2 relocalization to a detergent-insoluble fraction, enhancing TNF-R2-induced JNK activation without affecting NF-κB.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation, ubiquitination assays, subcellular fractionation, JNK and NF-κB assays\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid confirmed by Co-IP, ubiquitination and fractionation assays, single lab\",\n      \"pmids\": [\"18671942\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"TRAF2 functions as an activator switch for MST1 under oxidative stress: H₂O₂ induces physical interaction between TRAF2 and MST1, promoting MST1 homodimerization and activation; TRAF2 is required for H₂O₂-induced JNK, p38 activation, and apoptosis downstream of MST1.\",\n      \"method\": \"Co-immunoprecipitation (H₂O₂-dependent), MST1 homodimerization assays, TRAF2 knockdown, kinase activation assays\",\n      \"journal\": \"Free Radical Biology & Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus functional knockdown data, single lab\",\n      \"pmids\": [\"26698664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"CDK9 interacts with the conserved TRAF-C domain of TRAF2; endogenous interaction is specific to differentiated tissue; TRAF2-mediated signaling may incorporate CDK9 for cell survival in myotubes.\",\n      \"method\": \"Yeast two-hybrid screen, domain mapping, endogenous co-immunoprecipitation\",\n      \"journal\": \"Journal of Cellular Biochemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — yeast two-hybrid confirmed by Co-IP in tissue context, functional consequence speculative\",\n      \"pmids\": [\"9827693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"T2BP (TRAF2 binding protein) interacts with the TRAF domain of TRAF2 (confirmed by co-immunoprecipitation); overexpression of T2BP activates NF-κB and AP-1 in a dose-dependent manner without TNF stimulation.\",\n      \"method\": \"Mammalian two-hybrid screening, co-immunoprecipitation, NF-κB and AP-1 reporter assays\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, Co-IP confirmation of two-hybrid, no mechanistic epistasis established\",\n      \"pmids\": [\"11798190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The KSHV oncoprotein vFLIP contains a TRAF-interacting motif (PYQLT) and directly binds TRAF2 in vitro and in PEL cells; TRAF2 and TRAF3 are required for vFLIP-induced NF-κB activation and cell survival; TRAF2 (not TRAF3) mediates vFLIP association with the IKK complex; P93A/Q95A mutations in vFLIP abolish TRAF2 binding and NF-κB signaling.\",\n      \"method\": \"In vitro pulldown, co-immunoprecipitation in cells, dominant-negative TRAF2/3, vFLIP point mutants, NF-κB reporter assays\",\n      \"journal\": \"EMBO Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro pulldown plus Co-IP, mutagenesis of binding motif, TRAF2 dominant-negative, single lab\",\n      \"pmids\": [\"16311516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PKN1 directly binds the TRAF domain of TRAF2 via a PXQX(S/T) motif (PIQES at residues 580-584); P580A/Q582A mutation abolishes co-immunoprecipitation; PKN1 RNAi downregulates TRAF2-induced NF-κB activation.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding with TRAF2 deletion mutants, co-immunoprecipitation, PKN1 mutagenesis, RNAi, NF-κB reporter assays\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro domain mapping plus mutagenesis, RNAi with functional readout, single lab\",\n      \"pmids\": [\"14741690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TRAF2 interacts with the intracellular domain of LILRB3; activated LILRB3 recruits cFLIP via TRAF2, upregulating NF-κB to promote leukemic cell survival; hyperactivation of NF-κB induces A20-mediated negative feedback that disrupts LILRB3-TRAF2 interaction, switching to SHP-1/2-dominant inhibitory signaling.\",\n      \"method\": \"Co-immunoprecipitation, LILRB3 intracellular domain binding assays, NF-κB activation assays, antagonizing antibodies, functional leukemia models\",\n      \"journal\": \"Nature Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional signaling and antibody blockade assays, single lab\",\n      \"pmids\": [\"35122056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"SMYD2 methyltransferase methylates TRAF2 (cytoplasmic protein), stabilizing it by restraining its own proteolysis and enhancing NF-κB signaling activity; the demethylase LSD1 reverses SMYD2-mediated TRAF2 methylation.\",\n      \"method\": \"Mass spectrometry identification of methylation site, pull-down, immunoprecipitation, methyltransferase assay, ubiquitination assay, luciferase reporter, SMYD2 loss/gain-of-function, in vivo inflammation models\",\n      \"journal\": \"Clinical and Translational Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro methyltransferase assay plus multiple orthogonal methods, single lab\",\n      \"pmids\": [\"34841684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRAF2 acts as a K63-linked E3 ubiquitin ligase for p62, ubiquitinating it at K420; TRAF2-mediated p62 K63-ubiquitination activates mTORC1 by promoting the p62-mTORC1-Rag complex and lysosomal localization of mTORC1; TRAF2 depletion causes p62 accumulation and suppresses mTORC1 activity and liver cancer cell growth.\",\n      \"method\": \"Proteomics/Co-immunoprecipitation, K63-ubiquitination assay with K420 mutagenesis, mTORC1 lysosomal localization assays, in vivo tumor models\",\n      \"journal\": \"Cell Death and Differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus site-directed ubiquitination mutagenesis, in vivo validation, single lab\",\n      \"pmids\": [\"37081115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"UCHL3 deubiquitinase stabilizes TRAF2 by removing K48-linked ubiquitin chains, preventing proteasomal degradation; UCHL3-mediated TRAF2 stabilization activates NF-κB signaling in ovarian cancer.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, UCHL3 knockdown, NF-κB luciferase assays, in vivo tumor models\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus ubiquitination assay and functional rescue, single lab\",\n      \"pmids\": [\"31477831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRAF2 E3 ubiquitin ligase activity mediates K63-linked ubiquitination of DYRK1A at a PVQE motif-binding site, causing DYRK1A translocation to vesicle membranes; vesicle-localized DYRK1A phosphorylates Sprouty 2, inhibiting EGFR degradation; TRAF2 depletion accelerates EGFR degradation.\",\n      \"method\": \"Co-immunoprecipitation, K63-ubiquitination assay, subcellular localization by imaging, TRAF2 knockdown, EGFR degradation assays\",\n      \"journal\": \"Cell Death & Disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, ubiquitination assay with functional localization consequence, single lab\",\n      \"pmids\": [\"34117217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CD27 recruits TRAF2 and the phosphatase SHP-1 after ligand-induced internalization; the CD27-TRAF2-SHP-1 axis modulates TCR and CD28 signals during naive CD8+ T cell activation to promote memory-associated gene programs over effector differentiation.\",\n      \"method\": \"Co-immunoprecipitation of CD27-TRAF2-SHP-1 complex post-internalization, CD27 internalization imaging, gene expression profiling, CAR-T cell functional assays\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional gene program and T cell differentiation assays, single lab\",\n      \"pmids\": [\"38354704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TNFα stimulation induces TRAF2 to recruit GRK2 from the cytoplasm to the cell membrane; the TRAF2-GRK2 complex dissociates at the membrane, allowing GRK2 to desensitize and internalize EP4, reducing intracellular cAMP; TRAF2 siRNA abolishes TRAF2-GRK2 interaction and GRK2 membrane translocation.\",\n      \"method\": \"Co-immunoprecipitation (TRAF2-GRK2 complex), confocal microscopy for GRK2 translocation, cAMP FRET biosensor, TRAF2 siRNA knockdown\",\n      \"journal\": \"Acta Pharmacologica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus live-cell FRET and siRNA with functional receptor signaling readout, single lab\",\n      \"pmids\": [\"33859345\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PKCζ phosphorylates TRAF2 at Ser55 (not Ser11) under intestinal ischemia-reperfusion or hypoxia/reoxygenation conditions; Ser55 phosphorylation promotes NF-κB activation and suppresses c-Jun activation, protecting against intestinal I/R-induced apoptosis.\",\n      \"method\": \"Co-immunoprecipitation (PKCζ-TRAF2), site-directed mutagenesis (Ser55, Ser11), NF-κB and AP-1 reporter assays, apoptosis assays, in vivo I/R model\",\n      \"journal\": \"Cell Death & Disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific mutagenesis with in vivo confirmation, multiple signaling readouts, single lab\",\n      \"pmids\": [\"28726782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PP4R1 (regulatory subunit of protein phosphatase PP4) interacts with TRAF2 in a RING domain-dependent manner; PP4R1 dephosphorylates TRAF2 at Ser11; PP4R1 overexpression inhibits NF-κB activation by TRAF2, TRAF6, TNF, and LMP1; PP4R1 knockdown enhances LMP1 and TNF-induced IL-8 induction.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, RING domain mutagenesis, phosphatase activity assays (Ser11 dephosphorylation), NF-κB reporter assays, RNAi\",\n      \"journal\": \"Cellular Signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific interaction, phosphatase activity validation, RNAi, single lab\",\n      \"pmids\": [\"25134449\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"EBV BRRF1 protein (Na) interacts with TRAF2 in cells (consistent with yeast two-hybrid); TRAF2 is required for Na-induced JNK activation and lytic gene expression in epithelial cells; a JNK inhibitor abolishes Na's ability to disrupt viral latency.\",\n      \"method\": \"Co-immunoprecipitation in cells, TRAF2 requirement assay (dominant-negative/knockdown), JNK inhibitor, lytic gene expression assays\",\n      \"journal\": \"Journal of Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP plus functional inhibitor and requirement data, single lab\",\n      \"pmids\": [\"21325409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRAF2 has an essential role in facilitating physiological mitophagy in cardiac myocytes via its E3 ubiquitin ligase activity; loss of cardiac TRAF2 leads to impaired mitophagy, triggering inflammation and cell death that impairs myocardial homeostasis.\",\n      \"method\": \"Conditional cardiac TRAF2 knockout, mitophagy assays, inflammatory marker measurements, cardiac phenotype analysis\",\n      \"journal\": \"JACC Basic to Translational Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with mitophagy and inflammation functional readouts, single lab\",\n      \"pmids\": [\"35411325\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRAF2 is a RING-domain E3 ubiquitin ligase and scaffolding adaptor that is recruited to TNF receptor superfamily members (TNFR1, TNFR2, CD40, LTβR, and others) upon ligand-induced receptor oligomerization, where it activates canonical NF-κB signaling (via IKK recruitment facilitated by PKC-mediated Ser11 phosphorylation and Ubc13-dependent K63-ubiquitination), suppresses alternative NF-κB signaling (by scaffolding cIAP1/2 to ubiquitinate and degrade TRAF3, thereby targeting NIK for degradation), and activates JNK through a sequential TRAF2–ASK1/MLK3–MKK–JNK cascade requiring TRAF2 K63-ubiquitination and translocation to an insoluble cellular fraction; TRAF2 also suppresses necroptosis by associating with MLKL and promoting K63-ubiquitination of RIPK1, regulates mTORC2/mTORC1 balance by K63-ubiquitinating GβL, and its own stability is dynamically controlled by K48-ubiquitination (via cIAP1/Ubc6/cellular context) and deubiquitination (by UCHL3, USP48, and OTUD7b), as well as by phosphorylation from PKC, IKKε, and PKCζ and methylation by SMYD2.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TRAF2 is a trimeric RING-domain E3 ubiquitin ligase and scaffolding adaptor that couples TNF receptor superfamily members to NF-\\u03baB and stress-kinase signaling [#0, #3]. Its TRAF-C domain self-associates into a trimer that recognizes an SXXE-type receptor motif, providing an avidity-based mechanism for recruitment to ligand-oligomerized receptors such as TNF-R2 and CD40 [#3], and TRAF2 is required for canonical NF-\\u03baB activation downstream of these receptors and of the LIGHT-LT\\u03b2R axis [#0, #11, #19]. Genetically, TRAF2 is a positive regulator of canonical NF-\\u03baB but a negative regulator of the noncanonical pathway: it scaffolds K63-ubiquitination of cIAP1/cIAP2 to drive TRAF3 degradation and thereby keeps NIK destabilized, so its loss abolishes CD40-induced canonical signaling while constitutively activating p100-to-p52 processing [#7, #11]. TRAF2 separately drives JNK activation through a TRAF2\\u2013ASK1/MLK3 kinase cascade that requires Ubc13-dependent K63-ubiquitination of TRAF2 and its translocation to a detergent-insoluble compartment [#1, #6, #21]. Beyond receptor signaling, TRAF2's catalytic activity targets diverse substrates: it K63-ubiquitinates G\\u03b2L (MLST8) to bias mTORC1 over mTORC2 formation [#10] and ubiquitinates RIPK1 to suppress necroptotic and apoptotic cell death while restraining the MLKL necrosome [#16, #30]. TRAF2 abundance is itself a tightly regulated signaling node, set by K48-linked ubiquitination and proteasomal degradation by cIAP1 (with the ER E2 Ubc6) and opposed by the deubiquitinases CYLD, USP48, UCHL3, and OTUD7b, as well as by phosphorylation (PKC, IKK\\u03b5 at Ser11) and SMYD2 methylation [#5, #8, #13, #15, #29, #41]. In vivo, conditional deletion links TRAF2 to epithelial inflammation, hepatocellular carcinoma, and cardiac homeostasis [#27, #31, #30].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established TRAF2 as a shared signaling mediator by showing it is necessary and sufficient for receptor-driven NF-\\u03baB activation.\",\n      \"evidence\": \"Overexpression and RING-deleted dominant-negative analysis with NF-\\u03baB reporters across TNF-R2 and CD40\",\n      \"pmids\": [\"7544915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous requirement not yet shown genetically\", \"RING-domain enzymatic activity not yet defined\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defined the TRAF2\\u2013ASK1 link that routes TNF signaling into the JNK arm distinct from NF-\\u03baB.\",\n      \"evidence\": \"TNF-dependent reciprocal Co-IP plus catalytically inactive ASK1 dominant-negative and JNK assays\",\n      \"pmids\": [\"9774977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TRAF2 activates ASK1 mechanistically not resolved\", \"Role of TRAF2 ubiquitination not yet implicated\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Provided the structural basis for receptor-oligomerization-dependent recruitment by showing TRAF2 trimerizes and binds an SXXE consensus motif.\",\n      \"evidence\": \"X-ray crystallography of the TRAF domain alone and bound to TNF-R2 peptide with solution validation\",\n      \"pmids\": [\"10206649\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of full-length protein with RING domain not solved\", \"Conformational changes on activation not captured\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identified TRAF2-associated kinase complexes (TANK/TBK1) acting upstream of the IKK complex in NF-\\u03baB activation.\",\n      \"evidence\": \"Co-IP of ternary complex with kinase-dead TBK1 dominant-negative and NF-\\u03baB reporters\",\n      \"pmids\": [\"10581243\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological stimulus engaging this complex not defined\", \"Endogenous requirement not tested genetically\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Revealed that TRAF2 stability is actively controlled by cIAP1-mediated K48-ubiquitination, linking its turnover to apoptotic outcome.\",\n      \"evidence\": \"In vitro ubiquitination with E3-defective cIAP1 mutant, proteasome inhibitor and Co-IP in cells\",\n      \"pmids\": [\"11907583\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cognate E2 not identified at this stage\", \"Subcellular site of degradation not localized\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Separated TRAF2's roles using clean genetics, defining it as a positive regulator of canonical and a negative regulator of noncanonical NF-\\u03baB.\",\n      \"evidence\": \"B-cell-specific conditional knockout with NF-\\u03baB DNA-binding and proliferation assays\",\n      \"pmids\": [\"15539150\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of noncanonical suppression not yet defined (resolved later)\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Extended TRAF2 function to receptor-independent oxidative stress death via a RIP\\u2013TRAF2\\u2013JNK1 axis.\",\n      \"evidence\": \"TRAF2\\u2212/\\u2212 and RIP\\u2212/\\u2212 MEFs with reconstitution and H2O2-induced Co-IP and JNK assays\",\n      \"pmids\": [\"15199146\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Sensor of ROS upstream of TRAF2-RIP complex unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified TRAF2-bound regulators (PKN1) and a cytoplasmic-retention role for cIAP1/2, expanding the adaptor interactome.\",\n      \"evidence\": \"Yeast two-hybrid, domain-mapped binding, RNAi/NF-\\u03baB assays and confocal localization\",\n      \"pmids\": [\"14741690\", \"15265700\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab interactions without independent confirmation\", \"Physiological relevance of cIAP retention untested in vivo\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated that TRAF2 ubiquitination via its RING/zinc-finger and Ubc13 selectively drives JNK, not NF-\\u03baB or p38, coupled to insoluble-fraction translocation.\",\n      \"evidence\": \"Ubc13 RNAi, RING mutagenesis, subcellular fractionation with parallel pathway readouts\",\n      \"pmids\": [\"14713952\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of K63 chain attachment site not pinpointed here\", \"Nature of insoluble compartment not defined\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Localized cIAP1-mediated TRAF2 degradation to an ER-associated perinuclear compartment using the E2 Ubc6.\",\n      \"evidence\": \"Confocal ER co-localization, in vitro E2/E3 reconstitution and dominant-negative Ubc6\",\n      \"pmids\": [\"15861135\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trigger for ER translocation not defined\", \"Single-study reconstitution\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Distinguished LIGHT-LT\\u03b2R signaling from TNFR1 by showing TRAF2 dependence but RIP- and TRAF5-independence.\",\n      \"evidence\": \"Multiple KO MEF lines with reconstitution and receptor complex immunoprecipitation\",\n      \"pmids\": [\"15743811\", \"12571250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Apoptotic versus survival output balance not fully resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved the mechanism of noncanonical suppression: TRAF2 K63-ubiquitinates cIAP1/2 to license TRAF3 degradation and NIK stabilization.\",\n      \"evidence\": \"Genetic deletion models with biochemical reconstitution and ubiquitination assays\",\n      \"pmids\": [\"18997792\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of the cIAP-TRAF2-TRAF3 complex addressed structurally only later\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined the phosphorylation-to-ubiquitination relay: PKC-phosphorylated TRAF2 undergoes K63-ubiquitination at Lys31 to recruit IKK and TAB2/3.\",\n      \"evidence\": \"In vitro kinase assay, K31 mutagenesis, Co-IP and ubiquitination assays\",\n      \"pmids\": [\"19150425\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific PKC isoform and kinase regulation not exhaustively mapped\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placed MLK3 as a TRAF2-specific JNK-pathway effector activated by K63-ubiquitination.\",\n      \"evidence\": \"TNF-dependent Co-IP, domain mapping, RNAi and MLK3 kinase activity assays\",\n      \"pmids\": [\"19918265\", \"19586614\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab findings\", \"Whether MLK3 and ASK1 act redundantly or sequentially not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Provided the structural stoichiometry of the TRAF2/cIAP2 and TRAF1:TRAF2:cIAP2 complexes, explaining how TRAF1 modulates cIAP recruitment.\",\n      \"evidence\": \"X-ray crystallography with interface mutagenesis and solution binding\",\n      \"pmids\": [\"20385093\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of TRAF1 heterotrimer in vivo not fully tested\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified IKK\\u03b5 phosphorylation of TRAF2 at Ser11 as an oncogenic driver promoting K63-ubiquitination and NF-\\u03baB.\",\n      \"evidence\": \"In vitro kinase assay, Ser11 mutagenesis, K63 ubiquitination and transformation assays\",\n      \"pmids\": [\"23007157\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crosstalk between Ser11 and Lys31 modifications not dissected\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed TRAF2 abundance is set by kinase-directed lysosomal degradation (HGK/MAP4K4) with consequences for T-cell cytokine programs.\",\n      \"evidence\": \"In vitro kinase assay and T-cell-specific conditional HGK knockout\",\n      \"pmids\": [\"25098764\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Lysosomal versus proteasomal routing determinants unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established TRAF2 as a constitutive necroptosis brake via MLKL binding and CYLD-controlled deubiquitination, and linked CYLD-TRAF2 to HSC quiescence through p38MAPK.\",\n      \"evidence\": \"Domain-mapped Co-IP, KO cells/mice, necrosome assays; CYLD-binding mutant and p38 inhibition in HSCs\",\n      \"pmids\": [\"25882049\", \"25824820\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How MLKL binding gates necrosome assembly mechanistically not fully defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated in vivo that TRAF2 RING-dependent E3 activity, not SphK1-derived S1P, drives TNF signaling in epithelium.\",\n      \"evidence\": \"Keratinocyte-specific Traf2 KO compared with Sphk1-deficient mice and signaling readouts\",\n      \"pmids\": [\"26701909\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation with earlier SphK-dependence claims not fully addressed\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Expanded TRAF2 catalysis beyond immunity to metabolic control by K63-ubiquitinating G\\u03b2L to bias mTORC1 over mTORC2, reversed by OTUD7b.\",\n      \"evidence\": \"In vitro ubiquitination, G\\u03b2L site mutagenesis, Co-IP and genetic deletion in mice\",\n      \"pmids\": [\"28489822\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How signaling stimuli toggle this ubiquitination not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified additional deubiquitinases and phosphatases (USP48, PKC\\u03b6/Ser55, PP4R1) that fine-tune TRAF2 stability and output.\",\n      \"evidence\": \"Co-IP, K48-ubiquitination and phosphatase assays, site mutagenesis with pathway readouts\",\n      \"pmids\": [\"28874458\", \"28726782\", \"25134449\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab studies\", \"Context specificity of each regulator not cross-validated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed UCHL3 and OTUD7b stabilize TRAF2 by removing K48 chains, enabling RIPK1 K63-ubiquitination and survival signaling in cancer and DCs.\",\n      \"evidence\": \"Co-IP, K48/K63-specific ubiquitination assays, conditional KO and tumor/infection models\",\n      \"pmids\": [\"31477831\", \"37516734\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which DUB dominates in a given cell type unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected TRAF2 degradation to cardiac injury: doxorubicin-driven cIAP1-mediated TRAF2 loss impairs RIPK1 ubiquitination and NF-\\u03baB, with RING-dependent rescue in vivo.\",\n      \"evidence\": \"DOX mouse model, iPSC-cardiomyocytes, RING mutant and AAV9 cardiac overexpression\",\n      \"pmids\": [\"35983756\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mitochondrial protective mechanism downstream of NF-\\u03baB not fully delineated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified new K63 substrates (p62, DYRK1A) linking TRAF2 to mTORC1 activation and EGFR trafficking in cancer.\",\n      \"evidence\": \"Proteomics/Co-IP with site-directed ubiquitination mutagenesis and in vivo tumor models\",\n      \"pmids\": [\"37081115\", \"34117217\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab substrate assignments\", \"Selectivity among TRAF2 substrates not explained\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TRAF2 selects among its many K63 substrates and how the competing K48-degradative versus K63-signaling fates are coordinated in a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model integrating phosphorylation, methylation and DUB inputs onto substrate choice\", \"Quantitative dynamics of TRAF2 pools across compartments unmeasured\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [6, 7, 8, 10, 30, 40]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [7, 10, 30, 40, 42]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 3, 19]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [16, 33, 44]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [24, 39, 44]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [8, 44]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 8, 11, 19]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 11, 29, 43]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [5, 16, 18, 31]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [5, 7, 10, 29, 41]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [10, 40]}\n    ],\n    \"complexes\": [\n      \"TRAF2:cIAP1/cIAP2\",\n      \"TRAF1:TRAF2:cIAP2\",\n      \"TRAF2:TANK:TBK1\",\n      \"LT\\u03b2R signaling complex\"\n    ],\n    \"partners\": [\n      \"cIAP1\",\n      \"cIAP2\",\n      \"TRAF3\",\n      \"ASK1\",\n      \"MLK3\",\n      \"MLKL\",\n      \"RIPK1\",\n      \"CYLD\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}