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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Zobel, Kerry Deshayes, Kurt Vucic, Domagoj Fairbrother, Wayne J. Dynek, Jasmin N. Fedorova, Anna V. Goncharov, Tatiana Varfolomeev, Eugene |
| Description | Author Affiliation: Varfolomeev E ( Department of Protein Engineering, Genentech, Inc., South San Francisco, California 94080, USA.) |
| Abstract | The inhibitor of apoptosis (IAP) proteins are a family of anti-apoptotic regulators found in viruses and metazoans. c-IAP1 and c-IAP2 are recruited to tumor necrosis factor receptor 1 (TNFR1)-associated complexes where they can regulate receptor-mediated signaling. Both c-IAP1 and c-IAP2 have been implicated in TNFalpha-stimulated NF-kappaB activation. However, individual c-IAP1 and c-IAP2 gene knock-outs in mice did not reveal changes in TNF signaling pathways, and the phenotype of a combined deficiency of c-IAPs has yet to be reported. Here we investigate the role of c-IAP1 and c-IAP2 in TNFalpha-stimulated activation of NF-kappaB. We demonstrate that TNFalpha-induced NF-kappaB activation is severely diminished in the absence of both c-IAP proteins. In addition, combined absence of c-IAP1 and c-IAP2 rendered cells sensitive to TNFalpha-induced cell death. Using cells with genetic ablation of c-IAP1 or cells where the c-IAP proteins were eliminated using IAP antagonists, we show that TNFalpha-induced RIP1 ubiquitination is abrogated in the absence of c-IAPs. Furthermore, we reconstitute the ubiquitination process with purified components in vitro and demonstrate that c-IAP1, in collaboration with the ubiquitin conjugating enzyme (E2) enzyme UbcH5a, mediates polymerization of Lys-63-linked chains on RIP1. Therefore, c-IAP1 and c-IAP2 are required for TNFalpha-stimulated RIP1 ubiquitination and NF-kappaB activation. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 36 |
| Volume Number | 283 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2008-09-05 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Inhibitor Of Apoptosis Proteins Metabolism NF-kappa B Receptors, Tumor Necrosis Factor, Type I Signal Transduction Physiology Tumor Necrosis Factor-alpha Animals Cell Death Cell Line, Tumor GTPase-Activating Proteins Genetics Mice Mice, Knockout Nuclear Pore Complex Proteins RNA-Binding Proteins Ubiquitination Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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