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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Abbreviations
- NF-κB:
-
(nuclear factor kappa B)
- IRF:
-
(interferon regulatory factor)
- ISRE:
-
(IFN-stimulated response elements)
- CARD:
-
(caspase recruitment domain)
- TBK1:
-
(TANK-binding kinase 1)
- IKKÉ›:
-
(inhibitor of nuclear factor κB kinase subunit epsilon)
- RIG-I:
-
(retinoic acid-inducible gene I)
- MDA5:
-
(melanoma differentiation associated protein-5)
- SeV:
-
(Sendai virus)
- RBCK1:
-
(RBCC protein interacting with PKC1)
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Acknowledgements
We thank members of our laboratory for technical help and stimulating discussion. This work was supported by the National Basic Research Program of China (No. 2006CB504301) and the National Natural Science Foundation of China (No. 30630019 and No. 30570959).
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Zhang, M., Tian, Y., Wang, RP. et al. Negative feedback regulation of cellular antiviral signaling by RBCK1-mediated degradation of IRF3. Cell Res 18, 1096–1104 (2008). https://doi.org/10.1038/cr.2008.277
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DOI: https://doi.org/10.1038/cr.2008.277
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