温和菌体通过RNA引导的鞭毛体重塑来提高宿主健康
Matt W G Walker1,2, Egill Richard3,2, Tanner Wiegand3,4
1Department of Biological Sciences, Columbia University, New York, NY, USA.
bioRxiv : the preprint server for biology
|August 8, 2025
概括
菌体使用RNA引导调节器重塑细菌鞭毛,增强细菌的运动性和免疫逃逸. 这种由介导的鞭毛重塑改善了宿主殖民,并证明了与CRISPR-Cas系统的并行进化.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 进化生物学 进化生物学
背景情况:
- 细菌鞭状体对于机动性,化学反应和宿主-病原体相互作用至关重要.
- 鞭毛小单元的鞭毛素被免疫系统和菌体识别出来.
- 菌体编码的RNA引导转录因子 (TldR) 调节鞭毛蛋白的表达,但它们的生物学作用尚不清楚.
研究的目的:
- 研究TldR介导的鞭毛蛋白调节对宿主健康的生物学意义.
- 为了阐明如何prophages重塑鞭毛器官,以提高细菌的能力.
主要方法:
- 电子显微镜 (cryo-EM) 用于对鞭毛纤维的结构研究.
- 对人类临床Enterobacter分离物的分析,该分离物编码Flagellin重塑原体 (FRφ).
- 在小鼠肠道模型中进行体内殖民研究.
主要成果:
- 通过TldR和一种特定的鞭毛素异型,FRφ极大地改变了细菌鞭毛的组成和特性.
- 观察到增强的细菌运动性和改善的哺乳动物免疫反应的逃避.
- FRφ显著改善了小鼠肠道中的细菌殖民.
- 结构分析揭示了与生理变化相关的明显的线程架构.
结论:
- 体介导的鞭毛重塑增强了细菌的健康状况和宿主殖民.
- 像TldR这样的RNA引导转录因子与CRISPR-Cas系统并行进化.
- 菌体利用RNA引导的调节器来修改细菌鞭毛,在与宿主相关的环境中提供优势.
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