与细胞循环调节相关的DDB1-AMBRA1 E3酶受体复合物的结构
Ming Liu1, Yang Wang1, Fei Teng1,2
1Kobilka Institute of Innovative Drug Discovery, School of Medicine, The Chinese University of Hong Kong, Shenzhen, Shenzhen, 518172, China.
Nature communications
|November 22, 2023
概括
瘤抑制剂AMBRA1通过冷EM进行结构特征,揭示了其与DDB1.1的复合体. 这种相互作用稳定了AMBRA1,影响了细胞循环调节和基质无化.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- AMBRA1是一种瘤抑制蛋白,参与自和细胞循环调节.
- 它的内在混乱阻碍了以前的结构确定.
- AMBRA1在乌比奎丁结合系统中作为基质受体起作用.
研究的目的:
- 确定AMBRA1与DDB1.1复合体中的结构.
- 阐明AMBRA1稳定和基质招募的机制.
- 了解AMBRA1在泛素酶复合体中的作用.
主要方法:
- 二交换质谱法 (HDX-MS) 用于分析蛋白质动态.
- 低温电子显微镜 (cryo-EM) 用于确定AMBRA1-DDB1复合物的结构.
- 在实验室中使用AMBRA1突变的ubiquitination测试.
主要成果:
- HDX-MS显示AMBRA1是一种高度灵活的蛋白质,通过DDB1结合稳定.
- 冷电磁结构 (3.08 Å分辨率) 显示DDB1与AMBRA1的WD40域进行交互.
- 具有DDB1结合缺陷的AMBRA1突变损害了Cyclin D1的无化,并加速了细胞循环的进展.
结论:
- 对AMBRA1-DDB1复合体的结构洞察力为基质招募提供了一个机制.
- AMBRA1通过ubiquitin结合酶复杂相互作用在各种生理过程中起到关键的作用.
- 这些发现澄清了AMBRA1通过向蛋白质无化在细胞周期调节中的作用.
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