弗拉盖林诱导的NAIP5激活的结构基础
Bhaskar Paidimuddala1, Jianhao Cao1, Liman Zhang1
1Department of Chemical Physiology and Biochemistry, Oregon Health and Science University, Portland, OR 97239, USA.
Science advances
|December 6, 2023
概括
在NLR家族的亡抑制蛋白 (NAIP) 炎症酶使用"陷和锁"机制来结合细菌鞭毛蛋白 (FliC). 这种相互作用触发了对抗格兰氏阴性细菌的免疫防御必不可少的结构变化.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 微生物学 微生物学
背景情况:
- NAIP/NLRC4炎症酶对感知格拉姆阴性细菌成分至关重要.
- 之前的研究表明,NAIP在激活NLRC4时的作用是NAIP在激活NLRC4时的作用.
- 确切的NAIP配体识别和激活机制仍然不清楚.
研究的目的:
- 为了阐明NAIP在带结合时的激活机制.
- 调查非活性NAIP5.5的联结区域的动态.
- 为了确定NAIP5-FliC相互作用的结构基础.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于解决NAIP5-FliC复合物的结构.
- 在原子分辨率下分析蛋白质 - 配体相互作用.
- 调查结合体结合区域的动态.
主要成果:
- 在2.9-Å分辨率下确定NAIP5与FliC结合的冷EM结构.
- 揭示了NAIP5.5对FliC认可的"陷和锁"机制.
- 确定了涉及FliC域 (D0C,D0N) 和NAIP5区域 (疏水口袋,插入域,C端尾部) 的特定相互作用.
结论:
- 对NAIP5的FliC绑定涉及由不同的FliC和NAIP5域调解的连续的捕获和锁定事件.
- 这种机制诱导NAIP5的结构变化,可能导致NLRC4炎症酶激活.
- 提供了NAIP介导的细菌传感的详细结构理解.
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