酵母RAVE的结构与部分V 1复合体结合
bioRxiv : the preprint server for biology
|July 29, 2024
概括
RAVE复合体通过与V1亚复合体结合来调节真空类型的ATPases (V-ATPases). 这种通过冷EM可视化的相互作用显示了V1准备与VO复合体重组.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 结构生物学是结构生物学.
背景情况:
- 真空类型的ATPases (V-ATPases) 是细胞内酸性化在真核生物中必不可少的质子.
- V-ATPases包括可溶性V1和膜结合的VO亚复合体,可逆分离以调节活性.
- RAVE复合体 (真空体和内体的ATPase调节器) 对于V1-VO重新关联至关重要.
研究的目的:
- 用电子冷显微镜 (cryo-EM) 确定与V1亚复合体结合的酵母RAVE复合物的结构.
- 阐明RAVE促进V-ATPase亚复合体重组的机制.
主要方法:
- 使用电子冷显微镜 (cryo-EM) 可视化酵母RAVE-V1复合体.
- 结构分析的重点是RAVE子单位 (Rav1p,Rav2p,Skp1p) 与V1子综合体之间的相互作用.
主要成果:
- 结构显示RAVE是一个L形复合体,Rav2p面向膜,Skp1p距离两者.
- 只有Rav1p与V1直接相互作用,与亚单元A的一个独特区域结合.
- 虽然V1复合体部分分离 (缺少五个子单元),但它采用了适合VO结合的形状.
结论:
- RAVE复合体将V1子复合体与VO重组,调节V-ATPase活动.
- 结构洞察力揭示了对V-ATPase重组和功能至关重要的特定相互作用.
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