经典途径的分子决定因素补充了Borrelia burgdorferi与OspEF相关的蛋白质的抑制
Sheila Thomas1, Anna M Schulz1, John M Leong2
1Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, North Carolina, USA.
The Journal of biological chemistry
|March 29, 2024
概括
莱姆病细菌蛋白质ElpB和ElpQ可以抑制补充系统.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 结构生物学 结构生物学
背景情况:
- 补体系统对于天生的免疫是至关重要的,经典途径由C1复合体 (C1r,C1s) 启动.
- 莱姆病病原体Borrelia burgdorferi采用了补充逃避策略.
- ElpB和ElpQ是来自B. burgdorferi的外表面脂蛋白,通过准C1r和C1s来抑制经典通路激活.
研究的目的:
- 阐明Elp蛋白抑制经典途径蛋白酶的分子机制.
- 为了确定特定的结合部位和参与C1s相互作用的ElpQ上的关键残留物.
主要方法:
- 使用-交换质谱法 (HDX-MS) 绘制了C1s对ElpQ的结合.
- 根据HDX-MS数据指导ElpQ的局部定向突变发生.
- 使用表面等离子体共振 (SPR) 来评估ElpQ突变体与C1r和C1s的结合亲和力.
主要成果:
- HDX-MS在ElpQ.上发现了一个可谓的C1s结合部位.
- 突变和SPR揭示了ElpQ的C端残留物,包括保存的氨酸,对于C1r和C1s结合至关重要.
- 这种特定的氨酸残留物对于ElpQ和ElpB的补充抑制功能至关重要.
结论:
- 通过特定的分子决定因素,ELP蛋白与经典途径蛋白酶C1r和C1s相互作用.
- 在ElpQ中保存的C终端氨酸对于蛋白酶结合和随后的补充抑制至关重要.
- 这些发现增强了对Borrelia burgdorferi复杂的补体逃避机制的理解.
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