流感A病毒RNA聚合酶的结构为病毒基因组复制提供了洞察力
Haitian Fan1, Alexander P Walker1, Loïc Carrique2
1Sir William Dunn School of Pathology, University of Oxford, Oxford, UK.
Nature
|September 6, 2019
概括
研究人员确定了人类和禽流感A聚合酶 (FluPolA) 的结构,揭示了它们如何形成病毒RNA复制所必需的二元体. 针对这种二元化的纳米体抑制了病毒复制,表明了新的抗病毒药物标.
科学领域:
- 病毒学
- 结构生物学
- 分子机制
背景情况:
- 甲型流感病毒导致季节性流行病和大流行病,其复制依赖于病毒RNA依赖RNA聚合酶 (FluPolA).
- 人类和鸟类FluPolA的完整结构以及病毒RNA复制的机制在很大程度上是未知的.
- 之前的研究报告了蝙蝠FluPolA结构,但缺乏人类和鸟类菌株的数据.
研究的目的:
- 确定人类和禽流感A聚合酶 (FluPolA) 的高分辨率结构.
- 阐明病毒RNA (vRNA) 复制的分子机制,包括聚合酶寡合化和模板结合.
- 确定抗病毒药物开发的潜在目标.
主要方法:
- 使用结晶学和冷电子显微镜 (cryo-EM) 来确定FluPolA的结构.
- 在存在或缺少补充RNA (cRNA) 或vRNA模板时确定结构.
- 用细胞和体外测试来评估FluPolA二元化在vRNA合成和病毒复制中的作用.
主要成果:
- 获得了人类和鸟类FluPolA的高分辨率结构 (3.0-4.3 Å).
- 在溶液中,FluPolA会形成异构三元体的二元体,其中有特定的子单元和域参与相互作用.
- 确定二聚体接口是3' cRNA模板的结合部位,对于vRNA合成和病毒复制至关重要.
结论:
- 这项研究提供了人类和鸟类FluPolA的第一个高分辨率结构.
- FluPolA二分化对于病毒RNA复制至关重要,突出显示了二分体接口作为一个关键的功能部位.
- 一个抑制FluPolA二分化的纳米体有效地抑制了病毒复制,验证了这种接口作为新型抗病毒疗法的有希望的目标.
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