通过马尔科夫状态建模和NMR抑制辅助分子动力学模拟阐明Hsp70 Chaperone在客户端蛋白质折叠中的作用
Michael S O'Connor1, Kirill A Konovalov2, Josephine L Duvall2
1Biophysics Graduate Program, University of Wisconsin-Madison, Madison, WI, 53706, USA.
Biophysical journal
|August 28, 2025
概括
热冲击蛋白70 (Hsp70) 使用其闭盖状态来帮助像SH3这样的客户端蛋白正确折叠. 这种相互作用通过稳定特定的非极性残留物来防止错误折叠,揭示了伴侣辅助蛋白质折叠的关键机制.
科学领域:
- 分子生物学
- 生物物理
- 结构生物学
背景情况:
- 热冲击蛋白70 (Hsp70) 是一个关键的分子伴侣.
- Hsp70促进蛋白质折叠,并通过依赖ATP的循环防止聚合.
- Hsp70的构造状态,特别是它的盖子域,对它的功能至关重要.
研究的目的:
- 阐明 Hsp70 lid 域在客户蛋白 (CP) 相互作用和折叠中的作用.
- 研究Hsp70与其客户蛋白SH3之间的原子级相互作用.
- 了解Hsp70的形态如何影响SH3的折叠效率.
主要方法:
- 从Hsp70的粗粒度分子动力学 (MD) 模拟生成了马尔科夫状态模型 (MSM).
- 在明确溶剂中进行NMR距离控制辅助全原子MD模拟.
- 模拟的SH3客户端蛋白折叠与无核酸Hsp70结合并从中释放.
主要成果:
- 在与Hsp70的闭盖状态相互作用后,SH3客户端蛋白显示出更有效的折叠.
- Hsp70的闭盖状态通过保存的非极性残留物参与SH3.
- 这种特异性相互作用防止SH3在Hsp70释放时发生非原生疏水性崩.
结论:
- 在指导客体蛋白折叠方面,Hsp70的闭盖形状起着特定的作用.
- 涉及非极性残留物的原子级相互作用是Hsp70的辅助机制的关键.
- 这些发现为未来的实验提供了目标,以探测Hsp70辅助的蛋白质折叠.
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