通过寡合化促进的NLRP3激活的结构基础.
Xiaodi Yu1, Rosalie E Matico2, Robyn Miller2
1Johnson & Johnson Innovation Medicine, Spring House, PA, 19044, USA. xyu6@its.jnj.com.
Nature communications
|February 7, 2024
概括
含有NACHT,氨酸丰富的重复和pyrin域的蛋白3 (NLRP3) 经历了结构转变为开放的八合体,揭示了其激活机制. 这种寡合合作激活对于人类疾病中炎症细胞组合至关重要.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 免疫学 免疫学 免疫学
背景情况:
- 含有NACHT,氨酸丰富的重复和pyrin域的蛋白3 (NLRP3) 是先天免疫的一个关键传感器.
- NLRP3炎症酶与各种由炎症驱动的人类疾病有关.
- 精确的NLRP3激活机制,特别是其中间状态,仍然不太清楚.
研究的目的:
- 阐明NLRP3激活的结构基础.
- 为了研究寡合化在NLRP3功能中的作用.
- 了解NLRP3及其调节器NEK7.7之间的相互作用.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定NLRP3.3的结构.
- 用于检测特定接口的功能,采用了位点定向的突变发生.
- 为了研究NEK7/NLRP3相互作用,进行了生物化学测试.
主要成果:
- 冷-EM结构显示NLRP3形成了一个开放的八度体,在NACHT域中旋转90°左右.
- 开放的八合体接口中的突变损害了IL-1β信号传递,证实了它们在激活中的作用.
- 已经证明,中枢体酶NEK7会破坏大型NLRP3寡合体,形成单体/二元体,这是炎症体组合的先决条件.
结论:
- NLRP3的激活涉及一个合作的,寡合的机制.
- 开放的八次体状态是NLRP3炎症酶组合中的关键中间体.
- 通过破坏高阶寡合体的稳定性,NEK7在启动NLRP3激活级联中发挥着至关重要的作用.
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