酵母RAVE的结构与部分V1复合体结合
Hanlin Wang1,2, Maureen Tarsio3, Patricia M Kane3
1Molecular Medicine Program, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada.
概括
酵母体中真空体和内体体 (RAVE) 复合物的ATPase调节器与真空体类型ATPase (V-ATPase) 的V1亚复合物结合. 这种相互作用使V1与VO复合物重组,调节质子运输.
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 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的关键质子.
- 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复合体对于V1-VO重组至关重要,促进了V-ATPase的功能.
研究的目的:
- 为了阐明RAVE介导的V1-VO重组的结构基础.
- 为了确定酵母RAVE和V1亚复合体之间的相互作用接口.
- 了解RAVE结合如何影响VO协会的V1构成.
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L形RAVE复合体及其与V1子单元的相互作用.
- 与ATP合成酶结构的比较分析确定了独特的结合区域.
主要成果:
- 冷-EM结构显示了一个L形RAVE复合体,具有特定的子单元方向 (Rav2p向膜,Skp1p远).
- 只有Rav1p与V1直接相互作用,与ATP合成酶中不存在的亚单元A上的独特区域结合.
- 虽然V1复合体部分分离 (缺少子单元),但它采用一种有利于VO结合的形状.
结论:
- 雷夫作为支架,定位V1以高效地与VO重组.
- 由RAVE引起的相互作用界面和构造变化是调节V-ATPase质子活动的关键.
- 这种结构性洞察力为了解V-ATPase调节和潜在的治疗向提供了基础.
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