复制SARS-CoV-2聚合酶的结构
Hauke S Hillen1, Goran Kokic1, Lucas Farnung1
1Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.
Nature
|May 22, 2020
概括
我们确定了SARS-CoV-2依赖RNA聚合酶 (RdRp) 复合物的冷电子显微镜结构. 这种结构揭示了酶如何复制病毒基因组,并提供了对抗病毒药物机制的见解.
科学领域:
- 结构生物学
- 病毒学
- 分子生物学
背景情况:
- 严重急性呼吸系统冠状病毒2 (SARS-CoV-2) 依赖于依赖于RNA的RNA聚合酶 (RdRp) 进行基因复制和基因转录.
- 了解SARS-CoV-2 RdRp的结构对于开发抗病毒疗法对抗COVID-19至关重要.
研究的目的:
- 以其活跃复制形式呈现SARS-CoV-2 RdRp的冷电子显微镜结构.
- 阐明RdRp过程性及其与RNA的相互作用的结构基础.
- 提供针对SARS-CoV-2 RdRp的抗病毒药物的作用机制的见解.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定SARS-CoV-2 RdRp复合物的高分辨率结构.
- 该结构包括病毒蛋白nsp12,nsp8,nsp7和RNA模板产品双重.
主要成果:
- 该结构显示nsp12与RNA模板结合的活性位点裂,调解RdRp活性.
- 两个nsp8分子与裂结合,定位RNA并具有增强过程性的"滑动极".
- 观察到的结构为理解RdRp功能和抑制提供了详细的分子基础.
结论:
- 活性SARS-CoV-2 RdRp复合体的确定的结构提供了对病毒RNA复制的详细分子理解.
- nsp8 的"滑动极"解释了该酶的过程性,这对于复制长的冠状病毒基因组至关重要.
- 这些结构信息有助于分析抗病毒药物的抑制机制,例如针对SARS-CoV-2的remdesivir.
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