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Xia, Hongjie; Luo, Huanle; Shan, Chao; Muruato, Antonio E; Nunes, Bruno T D; Medeiros, Daniele B A; Zou, Jing; Xie, Xuping; Giraldo, Maria Isabel; Vasconcelos, Pedro F C; Weaver, Scott C; Wang, Tian; Rajsbaum, Ricardo; Shi, Pei-Yong
Nature communications, 01/2018, Volume: 9, Issue: 1Journal Article
Virus-host interactions determine an infection outcome. The Asian lineage of Zika virus (ZIKV), responsible for the recent epidemics, has fixed a mutation in the NS1 gene after 2012 that enhances mosquito infection. Here we report that the same mutation confers NS1 to inhibit interferon-β induction. This mutation enables NS1 binding to TBK1 and reduces TBK1 phosphorylation. Engineering the mutation into a pre-epidemic ZIKV strain debilitates the virus for interferon-β induction; reversing the mutation in an epidemic ZIKV strain invigorates the virus for interferon-β induction; these mutational effects are lost in IRF3-knockout cells. Additionally, ZIKV NS2A, NS2B, NS4A, NS4B, and NS5 can also suppress interferon-β production through targeting distinct components of the RIG-I pathway; however, for these proteins, no antagonistic difference is observed among various ZIKV strains. Our results support the mechanism that ZIKV has accumulated mutation(s) that increases the ability to evade immune response and potentiates infection and epidemics.
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