首页> 外文期刊>Nature >Host ANP32 A mediates the assembly of the influenza virus replicase
【24h】

Host ANP32 A mediates the assembly of the influenza virus replicase

机译:主机ANP32 A介导流感病毒复制酶的组装

获取原文
获取原文并翻译 | 示例
           

摘要

Aquatic birds represent a vast reservoir from which new pandemic influenza A viruses can emerge(1). Influenza viruses contain a negative-sense segmented RNA genome that is transcribed and replicated by the viral heterotrimeric RNA polymerase (FluPol) in the context of viral ribonucleoprotein complexes(2,3). RNA polymerases of avian influenza A viruses (FluPolA) replicate viral RNA inefficiently in human cells because of species-specific differences in acidic nuclear phosphoprotein 32 (ANP32), a family of essential host proteins for FluPol activity(4). Host-adaptive mutations, particularly a glutamic-acid-to-lysine mutation at amino acid residue 627 (E627K) in the 627 domain of the PB2 subunit, enable avian FluPolA to overcome this restriction and efficiently replicate viral RNA in the presence of human ANP32 proteins. However, the molecular mechanisms of genome replication and the interplay with ANP32 proteins remain largely unknown. Here we report cryo-electron microscopy structures of influenza C virus polymerase (FluPolC) in complex with human and chicken ANP32A. In both structures, two FluPolC molecules form an asymmetric dimer bridged by the N-terminal leucine-rich repeat domain of ANP32A. The C-terminal low-complexity acidic region of ANP32A inserts between the two juxtaposed PB2 627 domains of the asymmetric FluPolA dimer, suggesting a mechanism for how the adaptive PB2(E627K) mutation enables the replication of viral RNA in mammalian hosts. We propose that this complex represents a replication platform for the viral RNA genome, in which one of the FluPol molecules acts as a replicase while the other initiates the assembly of the nascent replication product into a viral ribonucleoprotein complex.
机译:水生鸟代表了一种巨大的水库,来自哪个新的大流行性流感病毒可以出现(1)。流感病毒含有负感发分段的RNA基因组,其在病毒核糖核糖蛋白复合物(2,3)的情况下由病毒异络RNA聚合酶(Flupol)转录和复制。由于酸性核磷蛋白32(ANP32)的种类特异性差异,Flupol活性(4)基本宿主蛋白质(4)的基本宿主蛋白质(4)的一类基本宿主蛋白质(4),禽流感的病毒(Flupola)病毒(Flupola)的病毒(Flupola)在人体细胞中复制了病毒RNA。宿主 - 适应性突变,特别是PB2亚基的627个结构域氨基酸残基627(E627K)的谷氨酸 - 赖氨酸突变,使禽弗洛拉能够在人ANP32的存在下克服这种限制并有效地复制病毒RNA蛋白质。然而,基因组复制的分子机制和ANP32蛋白的相互作用仍然很大程度上是未知的。在这里,我们将甲型C病毒聚合酶(Flupolc)的冷冻电子显微镜结构报告了与人和鸡ANP32A的复合物中的流感C病毒聚合酶(Flupolc)。在两个结构中,两个Flupolc分子形成由致ANP32A的N-末端亮氨酸的重复域桥接的不对称二聚体。 ANP32A的C末端低复合性酸性酸区在非对称Flupola二聚体的两个并置PB2 627结构域之间,表明适应性PB2(E627K)突变如何能够在哺乳动物宿主中复制病毒RNA的机制。我们提出这种复合物代表了病毒RNA基因组的复制平台,其中其中一种絮状酚分子用作复制酶,而另一个氟酚分子发起将新生复制产物的组装成病毒核糖核糖蛋白复合物。

著录项

  • 来源
    《Nature》 |2020年第7835期|638-643|共6页
  • 作者单位

    Univ Oxford Div Struct Biol Oxford England;

    Univ Oxford Sir William Dunn Sch Pathol Oxford England;

    Univ Oxford Sir William Dunn Sch Pathol Oxford England;

    Univ Oxford Div Struct Biol Oxford England;

    Univ Oxford Sir William Dunn Sch Pathol Oxford England;

    Univ Oxford Sir William Dunn Sch Pathol Oxford England|Imperial Coll London Sect Mol Virol London England;

    Imperial Coll London Sect Mol Virol London England;

    Univ Oxford Sir William Dunn Sch Pathol Oxford England;

    Univ Oxford Div Struct Biol Oxford England|Diamond Light Source Ltd Harwell Sci & Innovat Campus Didcot Oxon England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号