飞行员是移动的T3SS组件,参与细菌III型分泌系统的组装和基质特异性
Stephan Wimmi1, Moritz Fleck1, Carlos Helbig1
1Department of Ecophysiology, Max Planck Institute for Terrestrial Microbiology, Marburg, Germany.
Molecular microbiology
|January 5, 2024
概括
在动物病原体中,Pilotins对于III型分泌系统 (T3SS) 的注射酶组组合至关重要. 它们的缺失会损害早期基质出口,但不会损害晚期效应体分泌,从而揭示了T3SS功能中的新角色.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 细菌病原体的产生
背景情况:
- 第三类分泌系统 (T3SS) 是许多细菌病原体中关键的毒性因素.
- 组装T3SS注射体,特别是外膜分泌环,需要试点.
- 飞机蛋白是T3SS生物发生和功能所必需的小型脂蛋白.
研究的目的:
- 阐明飞行员在T3SS组装,功能和基板特异性中的特定角色.
- 在细菌分泌中识别试点蛋白的潜在新功能.
- 为了研究细菌细胞内的飞行素的定位和动态.
主要方法:
- 用于评估T3SS活动的功能测试.
- 蛋白质相互作用研究,以绘制飞行员相互作用的地图.
- 蛋白质组学用于识别相关的蛋白质.
- 活细胞显微镜可视化飞行员定位和动态.
主要成果:
- 由于Yersinia enterocolitica缺乏其试点蛋白 (SctG),形成了较少的极地注射体平台和针头.
- 缺少试验剂显著抑制了早期T3SS基板 (例如针子单元) 的出口.
- 晚期T3SS基质的分泌,包括病毒效应因子,在很大程度上不受飞行员缺席的影响.
- 飞行素与分泌素相互作用,但在短暂的移动集群中动态定位.
结论:
- 在T3SS注射基因组的正确组装和定位中,Pilotins起着至关重要的作用.
- 对于早期T3SS成分的分泌,需要选择性地使用Pilotins,而不是晚期效应者.
- 飞行员表现出动态的本地化,表明不仅仅是结构组装之外的角色.
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