主体ANP32A介导流感病毒复制酶的组装
Loïc Carrique1, Haitian Fan2, Alexander P Walker2
1Division of Structural Biology, University of Oxford, Oxford, UK.
Nature
|November 19, 2020
概括
由于宿主适应性突变,禽流感A病毒 (FluPolA) 可以感染人类. 我们揭示了流感C病毒聚合酶 (FluPolC) 与ANP32蛋白质复合的结构,揭示了复制机制.
科学领域:
- 病毒学
- 结构生物学
- 分子生物学
背景情况:
- 水鸟是流行性流感A病毒的存储库.
- 流感病毒RNA复制依赖于病毒RNA聚合酶 (FluPol) 和ANP32蛋白等宿主因素.
- 由于ANP32的物种特异性,禽流感PolA在人类细胞中表现出低效的复制,这种特异性可以通过PB2 ((E627K) 等突变来克服.
研究的目的:
- 阐明流感病毒基因组复制的分子机制.
- 了解流感病毒聚合酶与ANP32宿主蛋白之间的相互作用.
- 提供有关鸟类流感病毒宿主适应的结构见解.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定人类和ANP32A复合体中的流感C病毒聚合酶 (FluPolC) 的结构.
- 对FluPolC-ANP32A复合物的结构分析.
主要成果:
- 两个FluPolC分子通过ANP32A N终端域形成一个不对称的二元体.
- ANP32A C终端区域与FluPolC二极体的PB2 627域相互作用.
- 这种相互作用表明PB2 ((E627K) 突变如何促进哺乳动物宿主中的病毒RNA复制.
结论:
- 报告的冷EM结构揭示了ANP32介导的流感病毒RNA复制的分子基础.
- 这些发现提出了一个模型,其中聚合酶复合体作为复制平台,其中一个聚合酶分子复制RNA,另一个启动RNP组件.
- 这项研究提供了有关流感病毒宿主适应性和大流行潜力的关键见解.
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