来自微生物群的酸盐通过氨酸化促进了肠道出血性大肠杆菌的毒性
Linxing Li1,2,3, Yutao Liu1, Dan Liu1
1National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, TEDA Institute of Biological Sciences and Biotechnology, Nankai University, Tianjin, P. R. China.
Nature microbiology
|January 31, 2025
概括
苏酸盐通过修改PurR蛋白来增加细菌的毒性. 这种修饰,氨酸化,增强了EHEC和相关细菌中的毒性因子的表达.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 翻译后修改 翻译后修改
背景情况:
- 众所周知,酸盐可以调节肠道出血性大肠杆菌 (EHEC) 毒性.
- 氨酸化,一种翻译后的修饰,在真核生物中具有很好的特征,但在细菌中不太了解.
- 这项研究研究了 lysine succinylation 在调节细菌毒性中的作用.
研究的目的:
- 调查氨酸糖化在EHEC毒性中的作用.
- 为了识别通过化调节的细菌蛋白质.
- 阐明化影响毒性基因表达的机制.
主要方法:
- 通过细胞培养中的氨基酸进行稳定同位素标记 (SILAC) 基于蛋白质组的蛋白质组学,以表征EHEC糖.
- 在特定的氨酸残留物 (K24和K55) 中对PurR蛋白糖化进行分析.
- 在体外和体内测试使用细菌粘附,幼殖民和小鼠模型 (Citrobacter rodentium).
主要成果:
- 转录因子PurR被确定为K24和K55.5的基化.
- 糖化PurR抑制了其DNA结合能力,导致3型分泌系统 (T3SS) 表达的增加.
- 清除或突变的PurR (K24E/K55E) 增强了细菌的粘附和殖民.
- 在小鼠模型中,微生物群衍生的酸盐增加了PurR化,并促进了毒性.
结论:
- 氨酸化PurR是调节EHEC毒性的一个关键机制.
- 微生物酸盐水平通过PurR修饰影响细菌病原性.
- 鉴定出CitC是负责PurR修饰的顺转移酶,突出了一个新的调节途径.
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