通过SRP型GTPase对宏分子机器的极性限制
Anita Dornes1, Lisa Marie Schmidt2, Christopher-Nils Mais1
1Philipps-University Marburg, Center for Synthetic Microbiology (SYNMIKRO) and Department of Chemistry, Hans-Meerwein-Strasse 6, C07, 35043, Marburg, Germany.
Nature communications
|July 10, 2024
概括
细菌鞭毛组件由FlhF蛋白引导,该蛋白质将鞭毛组件固定在细胞极上. FlhG 调节了这个过程,控制了鞭毛结合的进展.
科学领域:
- 微生物学 微生物学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 细菌鞭毛是一个复杂的运动器官.
- 它的组装始于细胞杆上的MS环 (FliF) 和C环 (FliG,FliM,FliN).
- 对于SRP型GTPase FlhF的极性向的精确机制仍然是难以捉摸的.
研究的目的:
- 阐明FlhF将鞭毛蛋白组件引导到细菌细胞极的机制.
- 为了确定参与FlhF介导的极地定位的分子相互作用.
- 了解FlhG在鞭毛组合中的调节作用.
主要方法:
- 蛋白相互作用研究绘制FlhF结合伙伴的地图.
- 在野生型和突变菌株中对鞭毛蛋白位址的分析.
- 研究FlhF,HubP/FimV,FliF,FliG,FliM,FliN和FlhG之间的功能相互作用.
主要成果:
- FlhF将正在发展的鞭毛结构在极地标蛋白HubP/FimV.上.
- FlhF的GTPase域与HubP相互作用,而它的N终端域与FliG结合.
- FlhF结合的FliG与MS环蛋白FliF相互作用,形成一个FliF-FliG复合体,被招募到极点.
- FlhG调节FlhF活动,调节FliG与FliM-FliN的相互作用以及鞭毛组合的进展.
结论:
- FlhF充当一个关键的支架,通过HubP/FimV将鞭毛基底体组件与细胞极连接起来.
- 这种相互作用确保了正确的空间组织和鞭毛组装的启动.
- FlhG提供了对细胞极的鞭毛组合进展的调控控制.
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