Migration of Influenza Virus Nucleoprotein into the Nucleolus Is Essential for Ribonucleoprotein Complex Formation

Migration of Influenza Virus Nucleoprotein into the Nucleolus Is Essential for Ribonucleoprotein Complex Formation
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DOI:
10.1128/mbio.03315-21
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发表时间:
2022-01-04
期刊:
影响因子:
6.4
通讯作者:
Noda T
Noda T
中科院分区:
生物学1区
文献类型:
--
作者:
Miyamoto S;Nakano M;Morikawa T;Hirabayashi A;Tamura R;Fujita-Fujiharu Y;Hirose N;Muramoto Y;Noda T

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甲型流感病毒双螺旋核糖核蛋白复合物(RNP)执行病毒基因组RNA(vRNA)的转录和复制。虽然RNP的形成发生在病毒感染细胞的细胞核中,但参与这一过程的核结构域仍不清楚。在这里,我们表明,核仁是一个重要的网站功能RNP形成。病毒核蛋白(NP)是一种主要的RNP组分,暂时定位于病毒感染细胞的核仁。在一个核仁定位信号(NoLS)对NP的突变废除双螺旋RNP的形成,导致病毒RNA合成能力的损失,而异位融合的NoLS使NP突变体形成功能性双螺旋RNP。此外,病毒感染细胞的核仁破坏抑制NP组装成双螺旋RNP,导致病毒RNA合成减少。总的来说,我们的研究结果表明,NP迁移到核仁是功能性RNP形成的关键步骤,显示了核仁在流感病毒生命周期中的重要性。
Influenza A virus double-helical ribonucleoprotein complex (RNP) performs transcription and replication of viral genomic RNA (vRNA). Although RNP formation occurs in the nuclei of virus-infected cells, the nuclear domains involved in this process remain unclear. Here, we show that the nucleolus is an essential site for functional RNP formation. Viral nucleoprotein (NP), a major RNP component, temporarily localized to the nucleoli of virus-infected cells. Mutations in a nucleolar localization signal (NoLS) on NP abolished double-helical RNP formation, resulting in a loss of viral RNA synthesis ability, whereas ectopic fusion of the NoLS enabled the NP mutant to form functional double-helical RNPs. Furthermore, nucleolar disruption of virus-infected cells inhibited NP assembly into double-helical RNPs, resulting in decreased viral RNA synthesis. Collectively, our findings demonstrate that NP migration into the nucleolus is a critical step for functional RNP formation, showing the importance of the nucleolus in the influenza virus life cycle.
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