加斯德明 D 半氨酸残留物协同控制其棕化介导的膜向和组装
Eleonora Margheritis1, Shirin Kappelhoff1, John Danial2,3,4
1Department of Biology/Chemistry and Center for Cellular Nanoanalytics (CellNanOs), University of Osnabrück, Osnabrück, Germany.
The EMBO journal
|August 14, 2024
概括
气体皮质D (GSDMD) 孔组合涉及囊介导的寡合化和膜插入. 特定的半氨酸 (Cys39,Cys57,Cys192) 对于GSDMD构建块和在热时的功能性孔隙形成至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- 加斯德明D (GSDMD) 是热的关键执行者,这是一个被编程的细胞死亡途径.
- GSDMD在血中形成毛孔,导致细胞溶解.
- GSDMD毛孔组合的精确机制以及囊残留物的作用仍然不清楚.
研究的目的:
- 为了阐明Gasdermin D (GSDMD) 孔组合的机制.
- 调查特定的氨酸残留在GSDMD寡合化和膜插入中的作用.
- 了解GSDMD膜准的调节方法.
主要方法:
- 采用了单分子成像技术.
- 进行了氨酸残留物的局部导向突变发生.
- 实验使用人工膜和等离子膜.
主要成果:
- 在膜上,GSDMD预组装成二度和三度构建块.
- 氨酸残留物Cys39,Cys57和Cys192对于GSDMD的寡合化至关重要.
- Cys192的S-palmitoylation和负电荷的脂质控制了GSDMD的膜向.
- 同时的Cys39/57/192突变取消了GSDMD膜插入,而单个或对突变没有.
- Cys192或Cys39/Cys57对可使二聚体/三聚体形成,但所有这些都是高阶寡聚体所需的.
结论:
- GSDMD的寡合化遵循涉及氨酸残留的两步机制.
- Cys192棕化介导的膜结合和Cys39/57/192介导的寡合化在GSDMD孔组合中进行合作.
- 这项研究提供了关键的洞察力,了解了由GSDMD.GSDMD.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.D.
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