通过感知ATP的领先信使RNA控制沙门氏菌毒性位
Eun-Jin Lee1, Eduardo A Groisman
1Howard Hughes Medical Institute, Yale School of Medicine, Section of Microbial Pathogenesis, New Haven, Connecticut 06536-0812, USA.
Nature
|June 16, 2012
概括
沙门氏菌细菌通过检测增加的ATP水平来感知酸性环境,从而提高了关键毒性基因 (mgtC) 的表达. 这种ATP感应机制对于沙门氏菌的生存和宿主巨细胞内的毒性至关重要.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 病变的发生和发病.
背景情况:
- 沙门氏菌 (Salmonella enterica) 是一种可选择性细胞内病原体,在巨细胞内存活.
- 宿主细胞区的酸化对于沙门氏菌的生存和病毒性基因表达至关重要.
- 沙门氏菌感知酸性环境的机制尚未完全理解.
研究的目的:
- 为了研究沙门氏菌如何感知巨细胞内的酸性环境.
- 确定细胞质ATP水平在调节沙门氏菌毒性基因表达中的作用.
- 阐明mgtC毒性基因的功能及其调节.
主要方法:
- 研究了介质酸化和增加ATP水平对mgtC基因转录的影响.
- 分析了mgtC领导信使RNA在感知ATP中的作用.
- 利用了一个突变的mgtC领导信使RNA缺乏ATP反应.
- 在具有突变mgtC领导者的小鼠中评估了沙门氏菌毒性.
主要成果:
- 细胞质ATP水平的增加促进mgtC基因转录,独立于直接酸化.
- 通过mgtC领导信使RNA中转录和翻译的合/解合来感知ATP.
- 在mgtC领导RNA中,一种阻止ATP感应的突变减少了小鼠中的毒性基因表达和沙门氏菌毒性.
结论:
- 沙门氏菌利用一种感知ATP的领先信使RNA来调节mgtC病毒性基因的表达.
- 这种机制使得沙门氏菌能够将细胞外酸性状况与细胞内代谢变化 (ATP水平) 联系起来.
- 病原体可以通过它们对细胞代谢物的影响来感知外部线索,为宿主-病原体相互作用提供了新的视角.
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