对细菌DSR2抗菌体防御系统NADase上的激活机制的结构洞察力
Hong Zhang1, Yu Li2,3, Lanlan Li1
1Provincial University Key Laboratory of Cellular Stress Response and Metabolic Regulation and Fujian Key Laboratory of Developmental and Neural Biology, College of Life Sciences, Fujian Normal University, Fuzhou 350117, PR China.
Science advances
|July 31, 2024
概括
防御相关的sirtuin2 (DSR2) 通过控制尼古丁胺氨酸二核酸 (NAD+) 水平来调节细菌的抗菌体防御. 它的活性由尾管蛋白 (TTP) 和DSAD1调节,揭示了关键的分子机制.
科学领域:
- 结构生物学是结构生物学.
- 分子机制的分子机制
- 细菌的耐药性是一种耐药性.
背景情况:
- 防御相关的Sirtuin2 (DSR2) 是一种Sirtuin蛋白,参与细菌的抗菌素防御.
- 在受感染细胞中,DSR2通过耗尽尼古丁胺氨酸二核酸 (NAD+) 来起作用.
- 菌素编码蛋白质对DSR2活性的精确调节机制尚不清楚.
研究的目的:
- 阐明控制DSR2 NADase活动调节的分子机制.
- 确定DSR2与其激活剂和抑制剂相互作用的结构基础.
- 为了解DSR2抗菌素防御系统提供基础.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定DSR2,DSR2-TTP复合体和DSR2-DSAD1复合体的结构.
- 生物化学测定用于调查DSR2 NADase活性.
- 对DSR2四聚体构造和蛋白质与蛋白质相互作用的结构分析.
主要成果:
- DSR2 形成一个四合体,具有明显的开放和闭合形状.
- 单体尾管蛋白 (TTP) 结合于封闭形状,激活DSR2的NADase活性.
- DSAD1结合了开放的构造,抑制了DSR2 NAD+水解的TTP介导激活.
结论:
- 通过TTP和DSAD1破译了DSR2 NADase活动调节的详细分子机制.
- 结构洞察力揭示了TTP如何激活和DSAD1如何抑制DSR2.2.
- 本研究提供了对DSR2抗菌素防御系统的基本理解.
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