莱吉欧内拉自身诱导器LAI-1的跨王国信号涉及抗菌性瓜尼酸结合蛋白GBP
Franziska Solger1, Jonas Rauch2, Simone Vormittag1
1Institute of Medical Microbiology, University of Zürich, Zürich, Switzerland.
PLoS pathogens
|April 29, 2025
概括
军团菌自诱因-1 (LAI-1) 信号抑制Dictyostelium discoideum的迁移,并限制细菌的生长. 这种跨王国的信号传输涉及在含有军团菌的真空分子-ER膜接触部位的酸盐结合蛋白 (GBP).
科学领域:
- 微生物学 微生物学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 肺炎菌 (Legionella pneumophila) 引起军团士兵病,并在一个独特的含有军团菌的真空细胞 (LCV) 中复制.
- L. pneumophila利用莱吉欧内拉自身诱导剂-1 (LAI-1) 进行信号传递,影响宿主细胞行为和细菌复制.
研究的目的:
- 调查LAI-1在L. pneumophila和Dictyostelium discoideum之间的跨王国信号传输中的作用.
- 阐明LAI-1影响宿主细胞迁移和细菌细胞内生长的机制.
主要方法:
- 在局部化研究中合成和应用azido-LAI-1衍生物.
- 同焦点显微镜观察LAI-1,azido-LAI-1和LCV标记物的同位化.
- 在野生型和缺乏瓜尼酸结合蛋白 (GBP) 的D. discoideum菌株中对L. pneumophila复制的分析.
主要成果:
- LAI-1及其衍生物抑制D. discoideum的迁移,并局部化到LCV,特别是在ER膜接触部位.
- 在D. discoideum中的酸盐结合蛋白 (GBP) 对于LAI-1介导的细菌生长抑制至关重要.
- GBP局限于LCV-ER膜接触部位,并以GBP依赖的方式限制细胞内L. pneumophila的复制.
结论:
- LAI-1通过吸引D. discoideum GBP来调解跨王国信号,D. discoideum GBP作为一种抗菌因子.
- GBP定位在LCV-ER膜接触部位,突出了这些结构在宿主-病原体相互作用中的重要性.
- LAI-1信号和GBP功能共同限制了L. pneumophila的细胞内扩散.
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