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Cited by 255

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The Kinase Activity of Rip1 Is Not Required for Tumor Necrosis Factor-α-induced IκB Kinase or p38 MAP Kinase Activation or for the Ubiquitination of Rip1 by Traf2

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Lee, Thomas H., Shank, Jennifer, Cusson, Nicole, Kelliher, Michelle A.·2004·Journal of Biological Chemistry

Abstract

The death domain kinase Rip1 is recruited to the tumor necrosis factor receptor type 1 and mediates the IkappaB kinase and p38 MAP kinase pathways. In response to tumor necrosis factor-alpha (TNF-alpha), we find Rip1 phosphorylated and ubiquitinated, suggesting that Rip1 phosphorylation may stimulate its ubiquitination. To address the contribution of the kinase activity of Rip1 to its ubiquitination and to TNF-alpha signaling, we introduced wild type Rip1 and a kinase-inactive form of Rip1, Rip1D138N, into rip1-/- murine embryonic fibroblast cells by retroviral infection. TNF-alpha-induced ubiquitination of Rip1 is observed in Rip1D138N cells, supporting the argument that Rip1 autophosphorylation is not required for Rip1 ubiquitination. TNF-alpha-induced Ikk and p38 MAP kinase activation is normal, and the Rip1D138N cells are resistant to TNF-alpha-induced cell death, indicating that the kinase activity of Rip1 is not required to mediate its antiapoptotic functions. In the absence of Traf2, TNF-alpha-induced ubiquitination of Rip1 is impaired, suggesting that Traf2 may be the E3 ubiquitin ligase responsible for the TNF-alpha-dependent, ubiquitination of Rip1. Finally, recruitment of the ubiquitinated Tak1 complex is dependent on the presence of Rip1, suggesting that Rip1 ubiquitination rather than its phosphorylation is critical in signaling.

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Authors
Lee, T. H., Shank, J., Cusson, N., & Kelliher, M. A.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2004-08
Volume
279
Issue
32
Pages
33185-33191
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2125185693
Cited by
255
References
1
FWCI
3.80
Type
journal article
Language
en
Open access
hybrid

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