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关于mopox病毒DNA聚合酶复合物F8-A22-E4-H5组件和机制的结构见解

Xiaohan Wang¹, Liangwen Ma², Ningning Li²

¹State Key Laboratory of Membrane Biology, Peking-Tsinghua Joint Center for Life Sciences, School of Life Sciences, Peking University, Beijing 100871, China.

|November 23, 2023

概括

姆波克斯病毒DNA复制涉及聚合酶F8和A22,E4和H5.5因子. 结构研究显示E4是E4.

科学领域:

病毒学病毒学
分子生物学分子生物学
结构生物学结构生物学

背景情况:

姆波克斯病毒的DNA复制对其生命周期至关重要.
这涉及病毒聚合酶F8和辅助因子 (A22,E4,H5).
这些因素的精确分子功能在很大程度上是未知的.

研究的目的:

为了阐明mopox病毒DNA复制的分子机制.
描述病毒聚合酶F8及其相关因子 (A22,E4,H5) 的结构性作用.

主要方法:

使用X射线晶体学来确定F8-A22-E4和F8-A22-E4-H5复合物的结构.
综合体与各种原始模板DNA基质进行了研究.
功能性测试评估了H5对DNA合成的影响.

主要成果:

该结构显示E4位于F8上游的单链DNA (ssDNA) 上,表现出催化活性,这表明基切割修复和DNA合成之间存在联系.
H5蛋白形成一个四聚体,与F8下游的双链DNA (dsDNA) 区域结合,类似于真核PCNA.
缺少或破坏H5结合显著损害了全长DNA产品的合成.

结论:

对F8-A22-E4和F8-A22-E4-H5复合物的结构洞察力提供了病毒聚合酶工作周期的快照.
E4的活性表明了结合的DNA修复和合成机制.
H5在过程性DNA合成中起着至关重要的作用,类似于真核细胞PCNA,突出显示病毒复制中的保存机制.

关键词:

A22-E4 这是一本书.H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H5 H3 H5 H5 H5 H5 H3 H4 H5 H5 H6 H7 H8 H8 H8 H8 H8 H8 H9 H9 在线阅读更多冷电子显微镜的使用方法的水病毒病毒.聚合酶全酵素的聚合酶全酵素过程性因素是一个过程性因素.乌拉 DNA 葡萄糖酶病毒DNA复制病毒DNA复制

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