解读FADD-procaspase-8-cFLIP复合体中的DED组装机制,这些复合体调节了亡
Chao-Yu Yang1, Chia-I Lien2, Yi-Chun Tseng1,3
1Genomics Research Center, Academia Sinica, Taipei, 11529, Taiwan.
Nature communications
|May 6, 2024
概括
对FADD, procaspase-8和cFLIP复合体的结构洞察力揭示了这些蛋白质如何调节细胞死亡途径. 原子结构阐明了控制亡和亡信号发育和疾病的机制.
科学领域:
- 分子和细胞生物学分子和细胞生物学
- 结构生物学 结构生物学
- 免疫学 免疫学 免疫学
背景情况:
- 具有死亡域 (FADD) 的 Fas-关联蛋白, procaspase-8 和细胞 FLICE 抑制蛋白 (cFLIP) 是细胞死亡信号的关键调节者.
- 它们通过死亡因子域 (DEDs) 的组合决定了细胞亡或细胞存活.
- 缺乏原子结构,因为它们的三元 DED 复杂,对调节机制的理解有限.
研究的目的:
- 为了确定人类FADD-procaspase-8-cFLIP复合物的原子坐标.
- 为了获得对控制死亡受体信号的相互作用的结构性见解.
- 阐明了亡和亡信号调节的机制.
主要方法:
- 在X射线晶体学.
- 低温电子显微镜 (cryo-EM) 是一种低温电子显微镜.
- 结构引导的突变发生.
主要成果:
- 确定了人类FADD-procaspase-8-cFLIP复合物的原子坐标.
- 这些结构揭示了FADD和cFLIP如何调节caspase-8复合体组合.
- 确定了一种螺旋式 procaspase-8-cFLIP 异质双层,可能促进细胞存活的有限 caspase-8 激活.
- 突变发生支持了三重FADD复合体在酶-8激活和RIPK1调节中的作用.
结论:
- 该研究提供了一个统一的DED组装和procaspase-8激活机制.
- 这些发现为调节亡和亡信号传递提供了机制性的解释.
- 这些结果对了解发育,免疫力和疾病中的细胞死亡有意义.
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