通过脱氧三酸盐激活康明抗病毒系统的导线驱动激活
Xiangkai Zhen1, Yu Li2, Zihe Liu1
1Key Laboratory of Microbial Pathogenesis and Interventions of Fujian Province University, the Key Laboratory of Innate Immune Biology of Fujian Province, Biomedical Research Center of South China, Key Laboratory of OptoElectronic Science and Technology for Medicine of the Ministry of Education, College of Life Sciences, Fujian Normal University, Fuzhou 350117, China.
细菌使用脱氧三酸盐 (dITP) 来激活免疫系统. 这项研究揭示了dITP结合是如何触发KOMBC线程组装和NADase活性,从而促进细菌免疫.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 核酸衍生的第二信使对细菌免疫力至关重要.
- 康明系统使用脱氧氨三酸盐 (dITP) 来通过KomC消耗尼古丁胺氨酸二核酸 (NAD+).
研究的目的:
- 阐明dITP识别和激活Kongming系统的结构和机制基础.
- 了解KOMBC复合组合和性调节在细菌免疫中的作用.
主要方法:
- 电子显微镜 (Cryo-EM) 用于确定KomBC复合物的结构.
- 生物化学分析和突变发生,以确认已识别的结构特征的功能作用.
主要成果:
- dITP结合稳定了KombB的二元化,从而启动了层次的全质变化.
- 这导致了KomBC丝组合,这对于激活KomC的NADase活性至关重要.
- 冷-EM结构揭示了dITP诱导的对NAD+水解的KomC催化口袋的重塑.
结论:
- 导线组装和全调节对于康明系统的催化活性至关重要.
- 这项研究阐明了核酸衍生的第二信使信号传递和Sir2 NADase激活在 prokaryotic 免疫中的新机制.
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