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单胞子发芽分析显示,在Clostridioides difficile发芽过程中释放的在前循环中的发芽功能

John W Ribis^1,2, Luana Melo¹, Shailab Shrestha^1,2

¹Department of Molecular Biology and Microbiology, Tufts University School of Medicine , Boston, Massachusetts, USA.

|June 20, 2023

概括

(Ca2+) 不是Clostridioides difficile子发芽的必要条件. 氨基酸共同发芽物可以独立诱导发芽,尽管Ca2+通过前循环增强了该过程.

科学领域:

微生物学微生物学
传染性疾病传染性疾病
细菌病原体的产生

背景情况:

困难杆菌感染始于小肠中的子发芽.
子发芽需要感知胆酸发芽物和共同发芽物 (氨基酸和Ca2+等双价离子).
之前的研究表明,Ca2+对C. difficile子发芽至关重要,基于大规模种群试验.

研究的目的:

调查是否需要两种共同发芽信号 (氨基酸和Ca2+) 来进行C. difficile子发芽.
克服大量测试的局限性,以分析Ca2+缺乏子中的发芽.
为了阐明Ca2+和二林酸 (CaDPA) 在C. difficile子发芽中的作用.

主要方法:

开发一种新的基于时隔显微镜的自动化发芽试验.
对CaDPA突变子发芽的单子水平分析.
野生型 (WT) 和CaDPA突变体子之间的发芽动力学的比较.

主要成果:

CaDPA突变子可以在单独对胆酸和氨基酸共同芽物的反应中发芽.
与WT子相比,对CaDPA突变子发芽需要更高度的氨基酸辅芽剂.
由 WT 子释放的 CaDPA 在一个前循环中起作用,以增强邻近子的发芽.

结论:

Ca2+对于诱导C. difficile子发芽是不可或缺的,这表明氨基酸和Ca2+共同发芽物的并行信号通路.
在C. difficile子发芽过程中,CaDPA起着增强作用,而不是一个重要的启动作用.
自动化显微镜为研究C. difficile子发芽提供了更准确的方法,特别是对于突变菌株.

关键词:

克洛斯特里迪奥伊德斯困难菌在 DPA 中,DPA 是 DPA 的代码.自动化图像分析系统一个共同发芽的芽物.子的发芽子的发芽时间间隔显微镜技术

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