一种分泌的细菌蛋白质通过被困在相隔液滴中来保护细菌免受性抗微生物的侵害
Nicholas K H Ostan1, Gregory B Cole1, Flora Zhiqi Wang1
1Department of Biochemistry, University of Toronto, Toronto, ON M5S 1A8, Canada.
PNAS nexus
|April 18, 2024
概括
像Moraxella bovis这样的细菌通过使用蛋白质来逃避免疫防御.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 哺乳动物宿主产生性抗微生物 (CAPs) 来对抗细菌感染.
- 病原体进化耐药机制,包括改变细胞表面或隔离CAPs.
- 一些蛋白质细菌分泌的乳酸铁素结合蛋白B (LbpB) 具有抑制CAPs的阳离子域.
研究的目的:
- 研究莫拉塞拉波维斯 (Moraxella bovis) 的LbpB离子域中和宿主CAPs的机制.
- 阐明 LbpB 阴离子域的结构和动态特性.
- 了解LbpB介导的相互作用如何导致细菌保护.
主要方法:
- 循环二重化 (CD) 光谱学 循环二重化 (CD) 光谱学
- 生物层干涉度测试是生物层干涉度测试.
- 交叉连接质谱法 交叉连接质谱法
- 显微镜的使用方法
- 在 SEC-MALS-SAXS 交易中.
- 核磁共振 (NMR) 谱学是指核磁共振的光谱学.
主要成果:
- LbpB阳离子域表现出α-螺旋结构,但缺乏稳定的三级折叠.
- 抗微生物 (乳糖) 诱导LbpB的相分离成滴.
- 这些LbpB-CAPs凝结物捕获抗菌,防止杀死细菌.
结论:
- 莫拉塞拉博维斯利用其LbpB蛋白的阳离子内在无序域来中和宿主CAPs.
- 生物分子凝聚物的形成是广泛抗微生物中和的关键机制.
- 这一策略突显出一种新型的细菌防御对宿主免疫力的作用.
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