在第七类菌株ESX分泌中的pH响应基质切换
bioRxiv : the preprint server for biology
|February 12, 2026
概括
致病性菌根细菌,如Mycobacterium marinum,适应其毒性因子分泌 (ESX-1基质切换) 作为对宿主细胞内的酸性环境的反应,帮助感染.
科学领域:
- 微生物学 微生物学
- 病原发生和发病.
- 宿主-病原体相互作用
背景情况:
- 致病性菌根菌,包括导致结核病的菌根菌,存在于宿主巨细胞内.
- ESX-1分泌系统 (早期分泌的抗原6千多顿系统-1) 对于菌根细菌的毒性至关重要,可使细胞溶解和宿主细胞入侵.
- 在不同细胞内环境中ESX-1的功能机制尚未完全理解.
研究的目的:
- 研究ESX-1分泌系统如何根据环境线索,特别是pH值来调整其功能.
- 阐明ESX-1基底切换背后的分子机制.
- 确定ESX-1基质切换在菌根菌感染模型中的作用.
主要方法:
- 在酸性条件下培养 *Mycobacterium marinum * *in vitro * *观察基质切换.
- 通过基因表达分析分析ESX-1基质转录水平的变化.
- 使用蛋白质组技术量化ESX-1基质和伴侣蛋白水平.
- 在酸性感染模型*in vivo*中评估特定ESX-1基质的要求.
主要成果:
- *Mycobacterium marinum* 在酸性pH下生长时表现出ESX-1基质切换 *in vitro*.
- 基质切换与ESX-1基质转录和蛋白质水平以及伴侣水平的显著改变有关.
- 特定的ESX-1转录被上调 *in vivo*,在酸性环境中感染需要不同的基质集.
结论:
- 根据环境的酸度,ESX-1分泌系统会动态切换其分泌的基板.
- 这种基质切换在转录和蛋白质水平上都受到调节.
- 菌根病原体可能利用独特的ESX-1蛋白质集在感染期间溶解不同酸度的巨细胞体,从而导致病原体的产生.
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