SARS-CoV-2 nsp12 attenuates type I interferon production by inhibiting IRF3 nuclear translocation.

SARS-CoV-2 nsp12 attenuates type I interferon production by inhibiting IRF3 nuclear translocation.
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SARS-CoV-2 nsp12 通过抑制 IRF3 核转位来减弱 I 型干扰素的产生

DOI:
10.1038/s41423-020-00619-y
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发表时间:
2021-04
影响因子:
24.1
通讯作者:
Wang J
Wang J
中科院分区:
医学1区
文献类型:
--
作者:
Wang W;Zhou Z;Xiao X;Tian Z;Dong X;Wang C;Li L;Ren L;Lei X;Xiang Z;Wang J

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SARS-CoV-2是COVID-19的病原体,COVID-19已演变为全球大流行。与其他呼吸道RNA病毒相比,SARS-CoV-2对I型干扰素(IFN)的诱导剂较差。在这里,我们报告了SARS-CoV-2 nsp12,病毒RNA依赖性RNA聚合酶(RdRp),抑制宿主抗病毒反应。SARS-CoV-2 nsp12减毒仙台病毒(SeV)-或多聚(I:C)-以剂量依赖性方式诱导IFN-β启动子激活。它还抑制rig - 1、MDA5、MAVS和IRF3过表达引发的IFN启动子激活。Nsp12不影响IRF3的磷酸化,但抑制IRF3的核易位。突变分析表明,这种抑制并不依赖于nsp12的聚合酶活性。鉴于这些发现,我们的研究揭示了SARS-CoV-2 RdRp可以拮抗宿主抗病毒先天免疫,从而为病毒的发病机制提供了新的见解。
SARS-CoV-2 is the pathogenic agent of COVID-19, which has evolved into a global pandemic. Compared with some other respiratory RNA viruses, SARS-CoV-2 is a poor inducer of type I interferon (IFN). Here, we report that SARS-CoV-2 nsp12, the viral RNA-dependent RNA polymerase (RdRp), suppresses host antiviral responses. SARS-CoV-2 nsp12 attenuated Sendai virus (SeV)- or poly(I:C)-induced IFN-β promoter activation in a dose-dependent manner. It also inhibited IFN promoter activation triggered by RIG-I, MDA5, MAVS, and IRF3 overexpression. Nsp12 did not impair IRF3 phosphorylation but suppressed the nuclear translocation of IRF3. Mutational analyses suggested that this suppression was not dependent on the polymerase activity of nsp12. Given these findings, our study reveals that SARS-CoV-2 RdRp can antagonize host antiviral innate immunity and thus provides insights into viral pathogenesis.
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