Recombinant Human TNF receptor-associated factor 2 (TRAF2)

Function

E3 ubiquitin-protein ligase that regulates activation of NF-kappa-B and JNK and plays a central role in the regulation of cell survival and apoptosis (PubMed:10346818, PubMed:11784851, PubMed:12917689, PubMed:15383523, PubMed:18981220, PubMed:19150425, PubMed:19810754, PubMed:19918265, PubMed:19937093, PubMed:20047764, PubMed:20064526, PubMed:20385093, PubMed:20577214, PubMed:22212761). Catalyzes 'Lys-63'-linked ubiquitination of target proteins, such as BIRC3, IKBKE, MLST8, RIPK1 and TICAM1 (PubMed:23453969, PubMed:28489822). Is an essential constituent of several E3 ubiquitin-protein ligase complexes, where it promotes the ubiquitination of target proteins by bringing them into contact with other E3 ubiquitin ligases (PubMed:15383523, PubMed:18981220). Regulates BIRC2 and BIRC3 protein levels by inhibiting their autoubiquitination and subsequent degradation; this does not depend on the TRAF2 RING-type zinc finger domain (PubMed:11907583, PubMed:19506082). Plays a role in mediating activation of NF-kappa-B by EIF2AK2/PKR (PubMed:15121867). In complex with BIRC2 or BIRC3, promotes ubiquitination of IKBKE (PubMed:23453969). Acts as a regulator of mTORC1 and mTORC2 assembly by mediating 'Lys-63'-linked ubiquitination of MLST8, thereby inhibiting formation of the mTORC2 complex, while facilitating assembly of the mTORC1 complex (PubMed:28489822). Required for normal antibody isotype switching from IgM to IgG (By similarity)

Subcellular Location

Cytoplasm

Subunit

Homotrimer (PubMed:8069916). Heterotrimer with TRAF1 (PubMed:8069916). Heterotrimer with TRAF3 (via TRAF domain) (PubMed:15383523, PubMed:20447407). The domain containing the RING-type and the first TRAF-type zinc finger can also form homodimers (in vitro) (PubMed:19810754). Interacts with TNFRSF1B/TNFR2 (PubMed:10206649, PubMed:7639698, PubMed:8069916). Interacts with TNFRSF5/CD40 (PubMed:9718306). Interacts with TNFRSF4, TNFRSF7/CD27, TNFRSF8/CD30, TNFRSF9/CD137, TNFRSF11A/RANK, TNFRSF13B/TACI, TNFRSF14, TNFRSF16/NGFR, TNFRSF17/BCMA, TNFRSF18/AITR, TNFRSF19/TROY, TNFRSF19L/RELT and EDAR (PubMed:10037686, PubMed:10411888, PubMed:10514511, PubMed:10809768, PubMed:10880535, PubMed:11035039, PubMed:38354704, PubMed:8627180, PubMed:9153189, PubMed:9418902, PubMed:9488716, PubMed:9607925, PubMed:9692890, PubMed:9774460). Stimulation of TNF receptor TNFRSF1A leads to the formation of two distinct signaling complexes. Plasma membrane-bound complex I is composed of TNFRSF1A, TRADD, RIPK1, TRAF2 and BIRC2/c-IAP1 or BIRC3 which interacts with CHUCK/IKK-alpha, IKBKB/IKK-beta and IKBKG/IKK-gamma promoting cell survival (PubMed:18981220, PubMed:21307340). Subsequently, TRADD, RIPK1 and TRAF2 dissociate from TNFRSF1A and form cytoplasmic complex II with FADD and caspase CASP8 promoting cell apoptosis (PubMed:21307340). Interacts with TRADD (PubMed:10892748). Identified in a complex with TNFRSF1A, RIPK1 and IKBKB/IKK-beta (PubMed:18981220). Interacts with RIPK2 (PubMed:9705938). Interacts with BIRC2 and BIRC3 N-terminus; a single BIRC2 or BIRC3 molecule interacts with a heterotrimer formed by TRAF1 and TRAF2, or a TRAF2 homotrimer (PubMed:11907583, PubMed:19506082, PubMed:20385093, PubMed:20447407). Identified in a complex composed of TRAF2, TRAF3, BIRC2 and BIRC3 (By similarity). Interacts with BIRC2; the interaction promotes BIRC2 stability (PubMed:19506082). Interaction with BIRC2 and/or BIRC3 is essential for ubiquitination of IKBKE, degradation of NFKBIA and activation of NF-kappa-B (By similarity). Within complex I, phosphorylated TRAF2 interacts (via 'Lys-63'-linked polyubiquitin chains) with CHUCK/IKK-alpha, IKBKB/IKK-beta, IKBKG/IKK-gamma TAB2, TAB3 and TAK1 in response to TNF stimulation (PubMed:19150425). Within complex I, interacts with UXT isoform 1 (via TPQE motif); the interaction prevents the recruitment of FADD and CASP8/caspase 8 to complex I (PubMed:21307340). Forms a complex composed of TNFRSF8/CD30 or TNFRSF1B/TNFR2, and TRAF1, TRAF2 and E3 ligase TRAIP (PubMed:9104814). Within the complex, interacts with TRAIP; the interaction inhibits TRAF2-mediated NF-kappa B activation (PubMed:9104814). Component of a complex composed of TANK and TBK1 (PubMed:10581243). Interacts with TRPC4AP (By similarity). Interacts with MAP3K1/MEKK1, MAP3K5/ASK1 and MAP3K11/MLK3 in response to TNF stimulation; the interaction leads to JNK activation and interaction with MAP3K5 is inhibited by PRMT1 (PubMed:10346818, PubMed:19918265, PubMed:22095282, PubMed:9774977). Component of a complex composed of MAP3K14/NIK BIRC3 and TRAF3; the interaction leads to BIRC2/3-mediated ubiquitination of TRAF3 upon CD40 engagement in a TRAF2-dependent manner (By similarity). Interacts with MAP3K14/NIK in response to TNF stimulation; the interaction leads to NF-kappa B activation (PubMed:9020361). Interacts with PEG3; the interaction may promote TRAF2-mediated NF-kappa B activation (By similarity). Interacts with HIVEP3; the interaction may inhibit TNF-TRAF2-mediated NF-kappa B and JNK activation (By similarity). Interacts with TANK/ITRAF; the interaction prevents interaction between TNFRSF1B/TNFR2 and TRAF2 (PubMed:8710854). Interacts with deubiquitinating enzyme CYLD; the interaction results in the deubiquitination and inactivation of TRAF2 (PubMed:12917691). Interacts with SIAH2; the interaction leads to TRAF2 ubiquitination and degradation (PubMed:12411493). Interacts with E2 conjugating enzyme UBE2N/Ubc13, E3 ligase ITCH and RNF11 in response to TNF stimulation (By similarity). Interacts with ubiquitin-editing enzyme TNFAIP3/A20 in response to TNF stimulation; the interaction promotes TRAF2 dissociation from UBE2N/Ubc13, ITCH, RNF11 and TAX1BP1 and prevents prolonged TRAF-2 ubiquitination (By similarity). Interacts with TAX1BP1 in response to TNF stimulation; the interaction promotes TRAF2 dissociation from UBE2N/Ubc13 and TNFAIP3/A20, and prevents prolonged TRAF-2 ubiquitination (By similarity). Interacts (via C-terminus) with EIF2AK2/PKR (via the kinase catalytic domain) (PubMed:15121867). Interacts with deubiquitinating enzyme USP48 (PubMed:16214042). Interacts with PTPN2; probably involved in TNF-mediated signaling (PubMed:15696169). Interacts with Toll-like receptor TLR4/3 adapter TICAM1/TRIF; the interaction may promote TICAM1 ubiquitination (PubMed:20047764). Interacts with kinase/endoribonuclease ERN1/IRE1 and DAB2IP in response to ER stress; the interaction requires DAB2IP (By similarity). Interacts with ERN1/IRE1 and TAOK3 in response to ER stress; the interaction may promote TRAF2 phosphorylation (PubMed:11278723). Interacts (via zinc fingers) with DAB2IP (via C-terminus PER domain)in response to TNF stimulation (PubMed:15310755, PubMed:17389591). Interacts with CASP8AP2/FLASH (By similarity). Interacts with NFATC2IP; the interaction may repress IL-4 production in T cells (By similarity). Interacts with kinase CDK9 (PubMed:9827693). Interacts with sphingosine kinase 1 SPHK1 (PubMed:20577214). Interacts with kinase TNIK (PubMed:10521462). Interacts with TRAFD1 (By similarity). Interacts with DNA phosphodiesterase TDP2 (PubMed:10764746). Interacts with MAVS/IPS1 (PubMed:16153868). Interacts with CARD14 (PubMed:21302310). Interacts with Epstein-Barr virus LMP1/BNFL1 (PubMed:10411888). Interacts with GPS2 (By similarity). Interacts with XPNPEP3 (PubMed:25609706). Interacts with RIPK3 (PubMed:29883609). Interacts with RELL2 (PubMed:19969290). Interacts with LRRC19 (PubMed:25026888). Interacts with GAPDH; promoting TRAF2 ubiquitination (PubMed:23332158)

Pathway

Protein modification; protein ubiquitination

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• The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC). — Genome Res. (2004)
• Rothe M. et al. A novel family of putative signal transducers associated with the cytoplasmic domain of the 75 kDa tumor necrosis factor receptor. — Cell (1994)