一个病原体效应器选择宿主RabGAP蛋白来重塑病原体界面并颠覆与防御有关的分泌物
Enoch Lok Him Yuen1, Yasin Tumtas1, Freddie King1
1Department of Life Sciences, Imperial College London, London SW7 2AZ, UK.
Science advances
|October 4, 2024
概括
植物病原体,如菌体使用效应器来操纵宿主细胞膜. 一个特定的效应器,PiE354,劫持宿主蛋白质 (TOPGAP),以阻止宿主-病原体界面的免疫反应.
科学领域:
- 植物病理学 植物病理学
- 分子植物微生物相互作用.
- 细胞微生物学 细胞微生物学
背景情况:
- 病原体进化出机制来操纵宿主细胞膜动态,以对抗免疫反应的生存.
- 宿主-病原体接口是病原体重塑宿主细胞膜以促进感染的关键位置.
研究的目的:
- 了解病原体如何将宿主-病原体接口转化为它们的优势.
- 为了识别参与操纵宿主膜动态和免疫反应的病原体效应者.
主要方法:
- 植物病原性菌体所分泌的保存效应因子 (PiE354) 的鉴定.
- 研究PiE354与宿主Rab GTPase激活蛋白 (RabGAP),TOPGAP之间的相互作用.
- 分析TOPGAP在调节血膜上的Rab8a GTPase活性中的作用.
主要成果:
- 菌体效应器PiE354劫持了宿主TOPGAP蛋白质,这是一个敏感性因素.
- PiE354利用TOPGAP的GTPase激活蛋白 (GAP) 活性来从血膜中去除Rab8a.
- 这一动作使Rab8a介导的免疫贩运从宿主-病原体接口转移,抑制宿主防御.
结论:
- 病原体已经进化出了复杂的效应因子,这些效应因子利用宿主调节元件来颠覆免疫反应.
- PiE354效应器的机制提供了对病原体如何重新编程宿主膜动态的机械洞察.
- 这项研究突出了菌体采用的新策略,通过操纵宿主分泌途径来逃避宿主免疫力.
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