有关ROS的S-palmitoylation激活物分离和完整的Gasdermin D
Gang Du1,2, Liam B Healy3,4, Liron David5,6,7
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, USA. gdu@crystal.harvard.edu.
Nature
|April 10, 2024
概括
气体皮质D (GSDMD) 是棕化,这是一种在热过程中对孔隙形成至关重要的改变. 这种可逆的棕化作为GSDMD激活的关键开关,挑战了先前的分裂是唯一的触发因素.
科学领域:
- 细胞生物学
- 免疫学
- 生物化学
背景情况:
- 气体皮质D (GSDMD) 是炎症酶激活的关键因子,通过形成跨膜毛孔来调解细胞因子分泌和热.
- 主要归因于其N终端域 (GSDMD-NT) 的孔形成.
研究的目的:
- 调查除了裂变之外的翻译后修改在GSDMD激活中的作用.
- 找出控制 GSDMD 中介性热的新调节机制.
主要方法:
- 在Cys191中使用生物化学测定来评估GSDMD的棕化.
- 通过裂变缺陷突变物和脂质体泄漏试验,研究S-palmitoylation对GSDMD孔隙形成和热的影响.
- 识别GSDMD棕转移酶 (ZDHHC5,ZDHHC9) 并通过炎酶激活和活性氧物种 (ROS) 分析它们的调节.
主要成果:
- GSDMD Cys191是S-palmitoylated,这种修饰对于孔隙形成至关重要,独立于酶裂变.
- 来自线粒体的活性氧物种 (ROS) 增强了GSDMD的棕化.
- 棕化GSDMD,包括裂变缺陷的形式,诱导脂质体泄漏和热,棕化作为气皮胺家族的关键激活开关.
结论:
- 可逆S-palmitoylation是Gasdermin D孔隙形成和热的关键检查点,作为Gasdermin家族的一般激活开关.
- 这一发现挑战了酶媒介裂变是GSDMD激活的唯一触发因素的范式.
- 棕化是调节炎症反应的新型治疗点.
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