我国链球菌部署多个依赖ATP的蛋白质,以适应热应激
Jianan Liu1,2,3, Jianzhong Wang4, Zhen Zhang1,2,3
1MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.
Journal of basic microbiology
|July 20, 2024
概括
我国链球菌利用多种蛋白酶,如FtsH和ClpP,来管理热应激并逃避免疫反应. 这种蛋白酶网络对于细菌在感染期间的生存至关重要.
科学领域:
- 微生物学 微生物学
- 细菌病原体的产生
- 压力反应应激反应
背景情况:
- 瑞菌 (Streptococcus suis) 是一种引起人类严重感染的动物性病原体.
- 细菌病原体必须适应宿主压力,例如发烧,才能生存.
- 蛋白酶在压力期间对错误折叠的蛋白质进行降解起着关键作用.
研究的目的:
- 研究ATP依赖蛋白酶在Streptococcus suis应激反应中的作用.
- 了解这些蛋白酶如何促进细菌的生存和毒性.
主要方法:
- 在各种压力条件下 (热,氧化,酸,寒冷) 分析Streptococcus suis蛋白酶基因表达.
- 使用基因删除突变体 (ftsH,clpP) 进行体外和体内研究,以评估细菌的存活率和耐压力.
- 确定控制蛋白酶基因表达的调控机制,包括CtsR.的作用.
主要成果:
- 我国链球菌编码了多个依赖ATP的蛋白酶 (FtsH,ClpAP,ClpBP,ClpCP,ClpXP).
- 由于热应激,ftsH,clpA/B/C和clpP基因的表达受到上调.
- 在体外和体内的热应激下,FtsH和ClpP对于S. suis的生存至关重要.
- 删除ftsH或clpP会降低对热,氧化和酸性压力的耐受性,并损害巨细胞内的生存能力.
- 压缩器CtsR调节了clp操作子,并因热应激而失活.
结论:
- 多个依赖ATP的蛋白酶形成了一个灵活的网络,用于S. suis的热应激反应.
- 这种网络使蛋白质降解/重新折叠的微调能够保持平衡并优化感染期间的生存.
- FtsH和ClpP是S. suis的关键毒性因子,特别是在热应激条件下.
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