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Cell Res. 2014 Apr;24(4):400-16. doi: 10.1038/cr.2013.170. Epub 2013 Dec 24.

USP3 inhibits type I interferon signaling by deubiquitinating RIG-I-like receptors.

Author information

  • 11] Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, College of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China [2] Center for Inflammation and Epigenetics, The Methodist Hospital Research Institute, Houston, TX 77030, USA.
  • 21] Center for Inflammation and Epigenetics, The Methodist Hospital Research Institute, Houston, TX 77030, USA [2] Central Laboratory, The First Affiliated Hospital, Jilin University, Changchun 130012, China.
  • 31] Center for Inflammation and Epigenetics, The Methodist Hospital Research Institute, Houston, TX 77030, USA [2] Institute of Biosciences and Technology, Texas A&M University Health Science Center, Houston, TX 77030, USA.
  • 4Center for Inflammation and Epigenetics, The Methodist Hospital Research Institute, Houston, TX 77030, USA.
  • 5Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, College of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China.

Abstract

Lysine 63 (K63)-linked ubiquitination of RIG-I plays a critical role in the activation of type I interferon pathway, yet the molecular mechanism responsible for its deubiquitination is still poorly understood. Here we report that the deubiquitination enzyme ubiquitin-specific protease 3 (USP3) negatively regulates the activation of type I interferon signaling by targeting RIG-I. Knockdown of USP3 specifically enhanced K63-linked ubiquitination of RIG-I, upregulated the phosphorylation of IRF3 and augmented the production of type I interferon cytokines and antiviral immunity. We further show that there is no interaction between USP3 and RIG-I-like receptors (RLRs) in unstimulated or uninfected cells, but upon viral infection or ligand stimulation, USP3 binds to the caspase activation recruitment domain of RLRs and then cleaves polyubiquitin chains through cooperation of its zinc-finger Ub-binding domain and USP catalytic domains. Mutation analysis reveals that binding of USP3 to polyubiquitin chains on RIG-I is a prerequisite step for its cleavage of polyubiquitin chains. Our findings identify a previously unrecognized role of USP3 in RIG-I activation and provide insights into the mechanisms by which USP3 inhibits RIG-I signaling and antiviral immunity.

PMID:
24366338
[PubMed - in process]
PMCID:
PMC3975496
[Available on 2015/4/1]
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