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甲型流感病毒确保病毒mRNA翻译的策略。

Strategies of Influenza A Virus to Ensure the Translation of Viral mRNAs.

作者信息

Li Hui-Chun, Yang Chee-Hing, Lo Shih-Yen

机构信息

Department of Biochemistry, Tzu Chi University, Hualien 97004, Taiwan.

Department of Laboratory Medicine and Biotechnology, Tzu Chi University, Hualien 97004, Taiwan.

出版信息

Pathogens. 2022 Dec 12;11(12):1521. doi: 10.3390/pathogens11121521.

Abstract

Viruses are obligatorily intracellular pathogens. To generate progeny virus particles, influenza A viruses (IAVs) have to divert the cellular machinery to ensure sufficient translation of viral mRNAs. To this end, several strategies have been exploited by IAVs, such as host gene shutoff, suppression of host innate immune responses, and selective translation of viral mRNAs. Various IAV proteins are responsible for host gene shutoff, e.g., NS1, PA-X, and RdRp, through inhibition of cellular gene transcription, suppression of cellular RNA processing, degradation of cellular RNAs, and blockage of cellular mRNA export from the nucleus. Host shutoff should suppress the innate immune responses and also increase the translation of viral mRNAs indirectly due to the reduced competition from cellular mRNAs for cellular translational machinery. However, many other mechanisms are also responsible for the suppression of innate immune responses by IAV, such as prevention of the detection of the viral RNAs by the RLRs, inhibition of the activities of proteins involved in signaling events of interferon production, and inhibition of the activities of interferon-stimulated genes, mainly through viral NS1, PB1-F2, and PA-X proteins. IAV mRNAs may be selectively translated in favor of cellular mRNAs through interacting with viral and/or cellular proteins, such as NS1, PABPI, and/or IFIT2, in the 5'-UTR of viral mRNAs. This review briefly summarizes the strategies utilized by IAVs to ensure sufficient translation of viral mRNAs focusing on recent developments.

摘要

病毒是专性细胞内病原体。为了产生子代病毒颗粒,甲型流感病毒(IAV)必须利用细胞机制来确保病毒mRNA的充分翻译。为此,IAV采用了多种策略,如宿主基因关闭、抑制宿主固有免疫反应以及病毒mRNA的选择性翻译。多种IAV蛋白负责宿主基因关闭,例如NS1、PA-X和RdRp,它们通过抑制细胞基因转录、抑制细胞RNA加工、降解细胞RNA以及阻断细胞mRNA从细胞核输出。宿主关闭应抑制固有免疫反应,并且由于细胞mRNA对细胞翻译机制的竞争减少,还会间接增加病毒mRNA的翻译。然而,许多其他机制也负责IAV对固有免疫反应的抑制,例如阻止RLR检测病毒RNA、抑制参与干扰素产生信号事件的蛋白质活性以及抑制干扰素刺激基因的活性,主要通过病毒NS1、PB1-F2和PA-X蛋白。IAV mRNA可能通过与病毒mRNA 5'-UTR中的病毒和/或细胞蛋白(如NS1、PABPI和/或IFIT2)相互作用而相对于细胞mRNA被选择性翻译。本综述简要总结了IAV为确保病毒mRNA充分翻译而采用的策略,重点关注近期进展。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6c51/9783940/77d07e471712/pathogens-11-01521-g001.jpg

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