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A High Resolution Method to Monitor Phosphorylation-dependent Activation of IRF3
Published on: January 24, 2016
Viperin weakens IFN-I-induced immune activity by facilitating STAT1 degradation through E3 ligase UBE4A
Ying Miao1,2, Yukang Yuan1,2, Liping Qian2
1Translational Clinical Immunology Key Laboratory of Sichuan Province, Department of Laboratory Medicine, Institute of Laboratory Medicine, Sichuan Provincial People's Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, 611731, Sichuan, China.
Abstract:
Viperin is considered as an antiviral protein known to directly target a variety of viruses. However, whether and how Viperin affects virus infection by targeting intracellular immune signaling remain unexplored. Here, we reveal that Viperin inhibits type-I interferon (IFN-I) antiviral immune signaling by degrading STAT1. We found that IFN-I upregulates the ubiquitin E3 ligase ITCH to degrade UBR5, while Viperin subsequently recruits another ubiquitin E3 ligase UBE4A to promote STAT1 ubiquitination and degradation to attenuate IFN-I signaling. Moreover, the multifunctional interfering peptide VS-IP1 can block Viperin-mediated STAT1 degradation, thus enhancing IFN-I antiviral immune function. This study reveals that Viperin is a suppressor of IFN-I immune signaling, which could renew understanding of the biological function of Viperin, and provide a strategy for enhancing clinical IFN-I therapeutic efficacy.
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