病原性细菌的传播被一个MARTX毒素效应器双重增强
Sanghyeon Choi1,2, Youngjin Lee2, Shinhye Park2,3
1Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Korea.
Nature communications
|July 23, 2024
概括
活虫使用MARTX毒素效应因子双重作用来破坏NAD+稳态,抑制免疫反应,导致败血症. 了解这种机制是开发毒素相关疾病新疗法的关键.
科学领域:
- 细菌病原发生的细菌.
- 分子微生物学分子微生物学
- 结构生物学是结构生物学.
背景情况:
- 多功能自动处理重复中毒素 (MARTX) 是一种关键的毒性因子,被像Vibrio vulnificus这样的细菌用来入侵宿主细胞.
- 杆菌会导致严重的感染,包括败血症,但MARTX介导的致病的精确分子机制尚未完全理解.
研究的目的:
- 阐明MARTX毒素效应因子双重 (DUF1/RID) 在细菌入侵和败血症中如何起作用的结构和机制基础.
- 揭示DUF1/RID复合物的分子相互作用与宿主目标,特别是calmodulin和Rac1.
主要方法:
- 确定DUF1/RID复合物的晶体结构.
- 低温电子显微镜 (cryo-EM) 解析了与calmodulin和Rac1.1复合的RDTND-RID双重结构.
- 在小鼠体外和体外免疫学分析.
主要成果:
- DUF1域作为一个依赖RID的转换NADase域 (RDTND) 起作用,通过劫持calmodulin来破坏NAD+平衡.
- RDTND-RID双重复合物修改了Rac1并耗尽了NAD(P) +,抑制了活性氧物种 (ROS) 的产生.
- 这些行为导致免疫反应的,细菌的传播,并诱导败血症.
结论:
- 这项研究揭示了复杂的分子机制,即Vibrio vulnificus使用MARTX毒素效应因子双重破坏宿主免疫力并引起败血症.
- 这些发现为开发针对MARTX毒素相关人类疾病的新疗法提供了基础.
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