通过多尺度模拟揭示了RAS-RAF复合物的动力学和脂质膜合
Timothy S Carpenter1, Fikret Aydin1, Chris Neale2
1Physical and Life Sciences (PLS) Directorate, Lawrence Livermore National Laboratory, Livermore, California.
Biophysical journal
|August 24, 2025
概括
膜环境通过在RAS-RBDCRD蛋白质复合体周围形成不同的脂质安排来影响RAS-RAF信号复合体的形成. 这些特定的膜相互作用增加了信号复杂组合的概率.
科学领域:
- 分子生物学
- 生物物理
- 计算化学
背景情况:
- RAS-RAF信号级联对于细胞过程至关重要,但其启动机制,特别是膜相互作用的作用,尚未完全理解.
- 了解膜脂质组成和RAS/RAF蛋白质行为之间的相互作用对于破译信号通路调节至关重要.
研究的目的:
- 研究RAS-RAF信号级联的分子和机械洞察力.
- 通过先进的模拟技术探索膜环境和RAS/RAF蛋白之间的复杂关系.
主要方法:
- 使用多尺度模拟框架,多尺度机器学习模型基础架构,集成粗粒度和全原子分子动力学模拟.
- 将 RAF RBDCRD 域与 RAS 蛋白一起纳入模拟,分析各种蛋白质/脂质组成配置.
- 从数百个蛋白质拷贝的微米级连续模拟生成的模拟数据.
主要成果:
- 膜上的RAS-RBDCRD蛋白质复合体采用不同的配置状态与独特的相关脂质排列,形成比单独的RAS更大的"指纹".
- 虽然观察到强烈的蛋白质复合关系,但没有统计学上显著的蛋白质-蛋白质偏向.
- 特定的膜环境似乎促进了RAS-RBDCRD蛋白的空间同位化,增加了信号复合体形成的可能性.
结论:
- 膜构成对RAS-RBDCRD蛋白质复合体的结构状态和空间组织有显著影响.
- 膜作为一个关键的调节器,通过空间定位增加了RAS-RAF信号复合体形成的可能性.
- 这些发现为分子层面的RAS-RAF信号发送提供了新的见解.
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