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在单细胞水平上对Bacillus subtilis Spx系统对二硫化物应激反应的新见解
Judith Matavacas1, Deepak Anand1, Claes von Wachenfeldt1
1Department of Biology, Lund University, Lund, Sweden.
Molecular microbiology
|June 18, 2023
概括
细菌细菌Spx-YjbH系统调节二硫化物应激反应. YjbH蛋白聚合增加了Spx水平,导致了短暂的生长抑制和人口异质性的压力生存.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 细胞应激反应的应激反应
背景情况:
- Spx 是 Bacillus subtilis 对二硫化物应激反应的关键调节者.
- YjbH (SpxH) 促进Spx降解,控制细胞Spx水平.
- 在压力下的YjbH聚合通过减少蛋白质分解来增加Spx水平.
研究的目的:
- 在二硫化物应激下研究Spx-YjbH系统在单个细菌细菌细胞中的体内动态.
- 描述YjbH聚合的机制和影响.
- 了解人口异质性在应激适应中的作用.
主要方法:
- 使用光报道器实时监测Spx和YjbH水平.
- 分析了YjbH聚合物的体内动态和遗传.
- 检查了YjbH域对聚合功能的贡献.
主要成果:
- 表明Spx水平和YjbH数量之间存在相关性,在压力下暂时抑制生长.
- 描述了YjbH总体动态为双极和驱动的核状排斥.
- 揭示了总负载中显著的人口异质性,影响细胞健康.
- 确定了DsbA类和翼螺旋域对YjbH聚合的贡献,并保留了DsbA类域聚合.
结论:
- Spx-YjbH系统在体内表现出复杂的动态,并在二硫化物应激过程中促进了种群异质性.
- YjbH聚合和由此产生的细胞异质性可能是细菌群体的生存机制.
- 了解 YjbH 域函数,可以让我们深入了解跨正义词的保存和分离的聚合机制.
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