通过人工智能引导的过渡路径采样捕获的STIM1跨膜螺旋体二分化
Ferdinand Horvath1, Hendrik Jung2, Herwig Grabmayr3
1Institute of Theoretical Physics, Johannes Kepler University Linz, 4040 Linz, Austria.
概括
流体相互作用分子1 (STIM1) 蛋白质二元化是感应的关键. 人工智能引导的模拟揭示了三种不同的STIM1跨膜螺旋二元体配置,澄清了其机制.
科学领域:
- 生物物理学的生物物理.
- 分子生物学分子生物学
- 信号传递 信号传递
背景情况:
- 流体相互作用分子1 (STIM1) 是一个关键的Ca2+传感器,位于内质网膜 (ER) 膜中.
- ER Ca2+ 枯竭会触发STIM1的结构变化,从而启动信号通路.
- 在这个过程中,STIM1的跨膜 (TM) 域的二元化是关键的早期步骤.
研究的目的:
- 阐明控制STIM1跨膜螺旋体二元化的原子化机制.
- 为了识别不同的STIM1二分体配置及其相关的过渡状态.
- 通过实验性突变发生研究来验证模拟结果.
主要方法:
- 利用人工智能引导的过渡路径采样 (aimmd) 进行广泛的分子动力学 (MD) 模拟.
- 在模拟ER的脂质双层环境中进行全原子MD模拟.
- 综合计算结果与体外光基的二分化倾向实验.
主要成果:
- 确定了三种不同的,共存的STIM1 TM螺旋二元体配置,解决了之前的实验差异.
- 主导的二次元配置具有X形接口,由SxxxG图案稳定.
- 在实验试验中,SxxxG基因的突变发生改变了STIM1二分化倾向.
- 标志着过渡状态组合,突出显示光线螺旋间接触的重要性.
结论:
- 人工智能引导的MD模拟为罕见的分子事件提供了前所未有的原子细节,例如STIM1二分化.
- STIM1 TM螺旋体二分化通过多个路径发生,受到光线相互作用的影响.
- 这些发现为STIM1在细胞平衡中的作用提供了机械的理解.
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