效应器结合顺序改变了膜上的KRAS微分化:对RAS介导的RAF激活的新见解
Soo-Yeon Lee1, Hyun-Jong Eun2, Ki-Young Lee3
1Department of Pharmacy, College of Pharmacy and Institute of Pharmaceutical Sciences, CHA University, Pocheon-si, Gyeonggi-Do, 11160, Republic of Korea.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|August 14, 2024
概括
在结构上阐明了对癌症至关重要的RAS-RAF复合体形成. RAF结合改变了KRAS二分化,揭示了RAF激活和信号复合组合的新机制.
科学领域:
- 生物化学 生化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- RAS蛋白质是细胞增殖和分化的关键调节者.
- 在等离子膜上形成RAS-RAF复合体与约25%的人类癌症有关.
- RAS-RAF复合组装和随后的RAF激活的精确机制仍然不太清楚.
研究的目的:
- 为了确定异构四面体KRAS-RAF1复合体的结构.
- 阐明RAF1结合改变KRAS二分化并激活RAF信号的机制.
- 为了提供对KRAS的全调节的见解.
主要方法:
- 利用纳米盘平台稳定了与膜相关的蛋白质复合体.
- 采用偏磁放松增强 (PRE) 分析来确定复杂结构.
- 进行了界面特定的突变发生,以验证结合界面和功能效应.
主要成果:
- 证明RAF1结合在膜上差异性地改变了KRAS二元化模式.
- 表明RAS-结合域 (RBD) 的结合以全质的方式诱导了不同的KRAS二元接口.
- 揭示了富含氨酸的域 (CRD) 与RAF1.1合作稳定了一个新的KRAS二元组合.
- 在RAF结合时确定了KRAS二分化的一次性改变,导致CRD相互作用和RAF释放.
结论:
- RAF1结合顺序调节KRAS二分化,提供RAF激活的机制.
- KRAS二元体的配置过渡为RAF1 CRD创建了一个交互点,释放自抑制的RAF复合体.
- 采用的纳米盘和PRE方法广泛适用于研究膜蛋白复合体.
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