SARS-CoV-2 main protease suppresses type I interferon production by preventing nuclear translocation of phosphorylated IRF3.

SARS-CoV-2 main protease suppresses type I interferon production by preventing nuclear translocation of phosphorylated IRF3.
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SARS-CoV-2主要蛋白酶通过阻止磷酸化IRF 3的核转位来抑制I型干扰素的产生。

DOI:
10.7150/ijbs.59943
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发表时间:
2021
影响因子:
9.2
通讯作者:
Jin DY
Jin DY
中科院分区:
生物学2区
文献类型:
--
作者:
Fung SY;Siu KL;Lin H;Yeung ML;Jin DY

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I型干扰素(IFN)应答的抑制是高致病性人冠状病毒感染的病理结果之一。为了实现这一点,严重急性呼吸综合征冠状病毒(SARS-CoV)和SARS-CoV-2编码多种IFN拮抗剂。本研究报道了干扰素(IFN)对SARS冠状病毒2型(SARS-CoV-2)主要蛋白酶NSP 5的拮抗作用。SARS-CoV和SARS-CoV-2的NSP 5蛋白都能抵消仙台病毒诱导的IFN产生。在SARS-CoV-2的循环株中常见的NSP 5变体G15 S和K90 R保留了IFN拮抗特性。NSP 5对RIG-I、MAVS、TBK 1和IKK β诱导的IFN-β基因转录的抑制作用表明,NSP 5可能在细胞质中作用于IRF 3磷酸化的下游步骤。NSP 5不影响IRF 3的稳态表达或磷酸化,表明IRF 3,无论其磷酸化状态如何,可能不是NSP 5蛋白酶的底物。然而,在NSP 5表达细胞中,磷酸化IRF 3的核转位严重受损。综上所述,我们的工作揭示了一种新的机制,通过这种机制,SARS-CoV和SARS-CoV-2编码的NSP 5蛋白通过将磷酸化的IRF 3保留在细胞质中来拮抗IFN的产生。我们的研究结果对合理设计和开发抗SARS-CoV-2的抗病毒药物具有重要意义。
Suppression of type I interferon (IFN) response is one pathological outcome of the infection of highly pathogenic human coronaviruses. To effect this, severe acute respiratory syndrome coronavirus (SARS-CoV) and SARS-CoV-2 encode multiple IFN antagonists. In this study, we reported on the IFN antagonism of SARS-CoV-2 main protease NSP5. NSP5 proteins of both SARS-CoV and SARS-CoV-2 counteracted Sendai virus-induced IFN production. NSP5 variants G15S and K90R commonly seen in circulating strains of SARS-CoV-2 retained the IFN-antagonizing property. The suppressive effect of NSP5 on IFN-β gene transcription induced by RIG-I, MAVS, TBK1 and IKKϵ suggested that NSP5 likely acts at a step downstream of IRF3 phosphorylation in the cytoplasm. NSP5 did not influence steady-state expression or phosphorylation of IRF3, suggesting that IRF3, regardless of its phosphorylation state, might not be the substrate of NSP5 protease. However, nuclear translocation of phosphorylated IRF3 was severely compromised in NSP5-expressing cells. Taken together, our work revealed a new mechanism by which NSP5 proteins encoded by SARS-CoV and SARS-CoV-2 antagonize IFN production by retaining phosphorylated IRF3 in the cytoplasm. Our findings have implications in rational design and development of antiviral agents against SARS-CoV-2.
DOI: 10.1016/j.virusres.2021.198350
发表时间: 2021-04-15
期刊: Virus research
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