Negative feedback regulation of cellular antiviral signaling by RBCK1-mediated degradation of IRF3

Cell Research
Min ZhangHong-Bing Shu

Abstract

Viral infection causes host cells to produce type I interferons (IFNs), which are critically involved in viral clearance. Previous studies have demonstrated that activation of the transcription factor interferon regulatory factor (IRF)3 is essential for virus-triggered induction of type I IFNs. Here we show that the E3 ubiquitin ligase RBCC protein interacting with PKC1 (RBCK1) catalyzes the ubiquitination and degradation of IRF3. Overexpression of RBCK1 negatively regulates Sendai virus-triggered induction of type I IFNs, while knockdown of RBCK1 has the opposite effect. Plaque assays consistently demonstrate that RBCK1 negatively regulates the cellular antiviral response. Furthermore, viral infection leads to induction of RBCK1 and subsequent degradation of IRF3. These findings suggest that the cellular antiviral response is controlled by a negative feedback regulatory mechanism involving RBCK1-mediated ubiquitination and degradation of IRF3.

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Citations

Jan 7, 2009·Cell Research·Tetsuo TsuchidaShizuo Akira
May 7, 2009·Proceedings of the National Academy of Sciences of the United States of America·Ying LiHong-Bing Shu
Dec 10, 2009·The Journal of Biological Chemistry·Shu LiHong-Bing Shu
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