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细菌鞭毛电机的现场结构在亚纳米分辨率上显示了适应增加扭矩的适应性
Tina Drobnič1,2, Eli J Cohen1, Thomas Calcraft3
1Department of Life Sciences, Imperial College London, London, UK.
Nature microbiology
|July 2, 2025
概括
研究人员在现场可视化了复杂的细菌鞭毛电机,揭示了像基底盘,中位盘和近位盘这样的周等离子体结构如何增加运动的扭矩. 这种结构洞察力有助于理解细菌推进进化的过程.
科学领域:
- 微生物学 微生物学
- 结构生物学 结构生物学
- 生物物理学的生物物理.
背景情况:
- 细菌鞭毛电机产生扭矩的运动性,复杂的结构进化以提高性能在粘性环境.
- 这些电机的现场可视化具有挑战性,限制了对它们的功能和演变的理解.
- 坎皮洛巴克特 (Campylobacter jejuni) 拥有最复杂的鞭毛电机之一,使其成为研究扭矩生成的关键模型.
研究的目的:
- 为了可视化Campylobacter jejuni鞭毛电机在位处以亚纳米分辨率.
- 阐明周等离子体扭矩增加结构的结构和功能.
- 为了深入了解细菌鞭毛扭矩生成的普遍原理.
主要方法:
- 开发一个Campylobacter jejuni迷你细胞系统用于in situ成像.
- 低温电子显微镜 (cryo-EM) 和单粒子分析.
- 用分子模型解释结构数据.
主要成果:
- 确定了Campylobacter jejuni鞭毛电机的现场结构,以亚纳米分辨率.
- 描述了基底盘 (FlgP),中间盘 (PflC-PflD网格) 和近端盘 (PflB-PflA线条).
- 证明PflAB二分化对于近接盘组装和通过FliL脚手架增加扭矩至关重要.
结论:
- 这项研究为复杂的细菌鞭毛运动提供了高分辨率的结构洞察力.
- 确定了对扭矩产生和细菌运动性至关重要的关键蛋白质相互作用.
- 在现场方法适用于其他膜结合的细菌分子机器.
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