DPP9封存NLRP1的C端以抑制炎症酶激活
L Robert Hollingsworth1,2,3, Humayun Sharif1,2, Andrew R Griswold4,5
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, USA.
Nature
|March 18, 2021
概括
双基酶8和9 (DPP8/DPP9) 通过与其C端片段相互作用来调节NLRP1炎症酶的激活. 像Val-boroPro这样的抑制剂会破坏这种相互作用,导致NLRP1的激活和炎症反应.
科学领域:
- 免疫学
- 分子生物学
- 结构生物学
背景情况:
- 核酸结合域和含有蛋白1 (NLRP1) 的氨酸丰富的重复皮林域是一个关键的炎症体传感器.
- NLRP1的激活会导致卡斯帕酶-1的激活,细胞因子的成熟和热,而它的失调会导致炎症性疾病.
- 细胞二基酶8和9 (DPP8/DPP9) 与NLRP1相互作用,但它们在NLRP1激活中的作用尚不清楚.
研究的目的:
- 通过DPP8/DPP9阐明NLRP1的结构基础.
- 了解DPP8/DPP9抑制剂激活NLRP1的机制.
- 研究NLRP1 C端片段 (NLRP1 CT) 在炎症酶激活中的作用.
主要方法:
- 用冷电子显微镜 (cryo-EM) 确定人类NLRP1-DPP9复合物的结构.
- 研究NLRP1,DPP9和DPP8/DPP9抑制剂之间的相互作用的生物化学测试.
- 用于评估炎症酶激活的功能测试.
主要成果:
- 冷EM结构显示了DPP9,全长NLRP1和NLRP1CT的三元复合体.
- NLRP1 CT与DPP9的结合需要全长的NLRP1,表示它们的比率的调节.
- 通过阻止NLRP1 CT N端进入DPP9活性位,从而促进NLRP1炎症酶的激活,Val-boroPro (VbP) 干扰了NLRP1 CT- DPP9相互作用.
结论:
- DPP9通过灭低水平的NLRP1CT作为一个检查点.
- 全长NLRP1与其C端片段之间的平衡调节NLRP1的激活.
- 像VbP这样的DPP8/DPP9抑制剂通过破坏NLRP1CT的抑制相互作用来激活NLRP1炎症体.
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