有着可适应的尖端的Tad pili在细菌掠食期间调解接触依赖的杀戮
Julien Herrou1, Laetitia My2, Caroline L Monteil3
1Aix Marseille Univ, CNRS, LCB, Marseille, France. jherrou@imm.cnrs.fr.
Nature communications
|May 13, 2025
概括
掠食性细菌Myxococcus xanthus使用专门的皮尔斯 (Kil系统) 和无针的III型分泌系统 (T3SS*) 来捕捉猎物. 较小的pilin复合体在pilus上形成可互换的尖端,可以检测和杀死各种细菌.
科学领域:
- 微生物学 微生物学
- 细菌的掠食行为
- 分子生物学分子生物学
背景情况:
- Myxococcus xanthus是一种掠食性细菌,通过直接接触杀死猎物.
- 这种捕食包括一个假定的紧固粘附柱 (Kil系统) 和一个无针的III型分泌系统 (T3SS*).
研究的目的:
- 在猎物接触点提供Kil pilus聚合的直接证据.
- 从遗传学上证明小皮林复合体在捕食特异性的作用.
- 阐明Kil系统与T3SS*之间的功能连接.
主要方法:
- 对Kil pilus聚合物的直接可视化.
- 基因分析小皮林复合体在捕食中的功能.
- 基尔柱的结构建模.
- 对其他细菌中的相关 pili 的基因组和结构分析.
主要成果:
- 在猎物接触部位,Myxococcus xanthus聚合了一种由KilP主要pilin组成的Kil pilus.
- 四个不同的小型皮林复合体作为可互换的"提示"来检测和杀死各种细菌猎物.
- 尖端活动取决于T3SS*,表明Kil系统和T3SS*之间的功能联系.
- 基因组数据表明,在其他细菌中,包括病原体中,也有类似的小皮林复合体定制.
结论:
- 基尔系统,其可变的小柱尖和T3SS*依赖性,代表了细菌掠食的复杂机制.
- 这些发现揭示了通过可互换的尖端复合体的柱状功能化的保存原则,它不仅适用于掠食性细菌.
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