平行调节电路调节生物膜的形成,以应对c-di-GMP水平和生长阶段的反应
Michael A Trebino1, Giordan Kitts1, James R J Haycocks2
1Department of Microbiology and Environmental Toxicology, University of California, Santa Cruz, Santa Cruz, California, United States of America.
PLoS genetics
|September 15, 2025
概括
对于生物膜形成至关重要的Vibrio cholerae VpvABC系统受到循环二-GMP (c-di-GMP) 和RpoS的调节. 这项研究揭示了两个平行调节电路控制这种必要的细菌过程.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 细菌病原体的产生
背景情况:
- 生物膜的形成对于微生物的生存和病原性至关重要.
- 循环二-GMP (c-di-GMP) 是一个关键的第二信使,调节生物膜发育.
- 霍乱病毒的VpvABC系统是一种迪加尼酸环酶 (DGC),对生物膜形成至关重要,但其调节尚未完全理解.
研究的目的:
- 阐明管理Vibrio cholerae vpvABC系统的监管机制.
- 确定控制VPvABC转录的因素及其在生物膜形成中的作用.
主要方法:
- 在Vibrio cholerae中对VPvABC系统的遗传剖析.
- 在不同的监管条件下对VPvABC进行转录分析.
- 调查c-di-GMP,VpsT,VpsR和RpoS在VPvABC监管中的作用.
主要成果:
- vpvABC系统是由c-di-GMP,VpsT和VpsR进行转录调节的.
- 替代性西格玛因子RpoS作为VPvABC转录的积极调节者.
- RpoS 影响生物膜架构,部分是通过 vpvC,而 vpvA 转录在生物膜基质附近最高.
结论:
- VpvABC表达由两个并行调节电路控制:一个c-di-GMP传感电路 (VpsT/VpsR) 和一个静止相电路 (RpoS).
- 这些发现突出了控制病原体生物膜形成的多层监管机制.
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