The SARS-CoV-2 protein NSP2 enhances microRNA-mediated translational repression.

The SARS-CoV-2 protein NSP2 enhances microRNA-mediated translational repression.
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DOI:
10.1242/jcs.261286
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发表时间:
2023-10-01
影响因子:
4
通讯作者:
--
中科院分区:
生物学2区
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--
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病毒利用microrna (mirna)来破坏宿主的抗病毒反应,并通过表达自身的mirna或选择细胞的mirna来促进病毒感染。mirna通过将GIGYF2-4EHP(或EIF4E2)翻译抑制复合体募集到mRNA 5 ' -cap结构,从而抑制其靶mRNA的翻译起始。我们最近报道了严重急性呼吸综合征冠状病毒2 (SARS-CoV-2)编码的非结构蛋白2 (NSP2)与GIGYF2相互作用。这种相互作用对于阻断编码细胞因子干扰素β的Ifnb1 mRNA的翻译至关重要,从而损害宿主的抗病毒反应。然而,尚不清楚NSP2是否也影响mirna介导的沉默。在这里,我们证明了NSP2普遍增强了mirna介导的细胞mrna的翻译抑制。我们发现NSP2通过GIGYF2与mirna诱导沉默复合物(miRISC)的核心成分AGO2相互作用,并增强细胞mrna 3 '非翻译区天然mirna结合位点介导的翻译抑制。我们的数据揭示了SARS-CoV-2和可能的其他冠状病毒通过选择宿主mirna介导的沉默机制来操纵宿主基因表达程序的复杂机制的另一层。摘要:SARS-CoV-2非结构蛋白2 (NSP2)通过与GIGYF2相互作用增强宿主microRNA靶mrna的翻译抑制,GIGYF2与mirna诱导的沉默复合物形成复合物。
Viruses use microRNAs (miRNAs) to impair the host antiviral response and facilitate viral infection by expressing their own miRNAs or co-opting cellular miRNAs. miRNAs inhibit translation initiation of their target mRNAs by recruiting the GIGYF2–4EHP (or EIF4E2) translation repressor complex to the mRNA 5′-cap structure. We recently reported that the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-encoded non-structural protein 2 (NSP2) interacts with GIGYF2. This interaction is critical for blocking translation of the Ifnb1 mRNA that encodes the cytokine interferon β, and thereby impairs the host antiviral response. However, it is not known whether NSP2 also affects miRNA-mediated silencing. Here, we demonstrate the pervasive augmentation of miRNA-mediated translational repression of cellular mRNAs by NSP2. We show that NSP2 interacts with argonaute 2 (AGO2), the core component of the miRNA-induced silencing complex (miRISC), via GIGYF2 and enhances the translational repression mediated by natural miRNA-binding sites in the 3′ untranslated region of cellular mRNAs. Our data reveal an additional layer of the complex mechanism by which SARS-CoV-2 and likely other coronaviruses manipulate the host gene expression program by co-opting the host miRNA-mediated silencing machinery. Summary: SARS-CoV-2 non-structural protein 2 (NSP2) enhances the translational repression of host microRNA target mRNAs through interaction with GIGYF2 that forms a complex with the miRNA-induced silencing complex.
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