Article ; Online: TRAF2 must bind to cellular inhibitors of apoptosis for tumor necrosis factor (tnf) to efficiently activate nf-{kappa}b and to prevent tnf-induced apoptosis.
The Journal of biological chemistry
2009 Volume 284, Issue 51, Page(s) 35906–35915
Abstract: Tumor necrosis factor (TNF) receptor-associated factor-2 (TRAF2) binds to cIAP1 and cIAP2 (cIAP1/2) and recruits them to the cytoplasmic domain of several members of the TNF receptor (TNFR) superfamily, including the TNF-TNFR1 ligand-receptor complex. ... ...
Abstract | Tumor necrosis factor (TNF) receptor-associated factor-2 (TRAF2) binds to cIAP1 and cIAP2 (cIAP1/2) and recruits them to the cytoplasmic domain of several members of the TNF receptor (TNFR) superfamily, including the TNF-TNFR1 ligand-receptor complex. Here, we define a cIAP1/2-interacting motif (CIM) within the TRAF-N domain of TRAF2, and we use TRAF2 CIM mutants to determine the role of TRAF2 and cIAP1/2 individually, and the TRAF2-cIAP1/2 interaction, in TNFR1-dependent signaling. We show that both the TRAF2 RING domain and the TRAF2 CIM are required to regulate NF-kappaB-inducing kinase stability and suppress constitutive noncanonical NF-kappaB activation. Conversely, following TNFR1 stimulation, cells bearing a CIM-mutated TRAF2 showed reduced canonical NF-kappaB activation and TNF-induced RIPK1 ubiquitylation. Remarkably, the RING domain of TRAF2 was dispensable for these functions. However, like the TRAF2 CIM, the RING domain of TRAF2 was required for protection against TNF-induced apoptosis. These results show that TRAF2 has anti-apoptotic signaling roles in addition to promoting NF-kappaB signaling and that efficient activation of NF-kappaB by TNFR1 requires the recruitment of cIAP1/2 by TRAF2. |
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MeSH term(s) | Amino Acid Motifs/physiology ; Animals ; Apoptosis/physiology ; Cell Line ; Inhibitor of Apoptosis Proteins/genetics ; Inhibitor of Apoptosis Proteins/metabolism ; Mice ; Mice, Knockout ; NF-kappa B/genetics ; NF-kappa B/metabolism ; Protein Binding/physiology ; Protein Structure, Tertiary/physiology ; Receptors, Tumor Necrosis Factor, Type I/genetics ; Receptors, Tumor Necrosis Factor, Type I/metabolism ; TNF Receptor-Associated Factor 2/genetics ; TNF Receptor-Associated Factor 2/metabolism ; Tumor Necrosis Factors/metabolism |
Chemical Substances | Inhibitor of Apoptosis Proteins ; NF-kappa B ; Receptors, Tumor Necrosis Factor, Type I ; TNF Receptor-Associated Factor 2 ; Tnfrsf1a protein, mouse ; Tumor Necrosis Factors |
Language | English |
Publishing date | 2009-10-08 |
Publishing country | United States |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ZDB-ID | 2997-x |
ISSN | 1083-351X ; 0021-9258 |
ISSN (online) | 1083-351X |
ISSN | 0021-9258 |
DOI | 10.1074/jbc.M109.072256 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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