使用原子学模拟,阐明底层全长FUS形状转换的分子相互作用网络及其相位分离
bioRxiv : the preprint server for biology
|July 14, 2025
概括
全原子模拟揭示了液-液相分离 (LLPS) 过程中,Fused in Sarcoma (FUS) 蛋白域和内在无序区域如何相互作用. 这为FUS相关疾病和潜在的治疗点提供了分子洞察力.
科学领域:
- 生物物理学的生物物理.
- 分子生物学分子生物学
- 计算化学的计算化学
背景情况:
- 化在肉瘤 (FUS) 是一种多域RNA结合蛋白,通过液-液相分离 (LLPS) 对细胞功能至关重要.
- 在原子层面上理解FUS LLPS受到蛋白质的低溶解度和复杂的域间相互作用的阻碍.
研究的目的:
- 通过使用全原子分子动力学 (MD) 模拟,研究全长 (FL) FUS在稀释和凝结阶段的结构动力学和域间相互作用.
- 为了准确地建模FL FUS行为,比较不同力场 (FF) 的性能.
主要方法:
- 用全原子 (AA) 分子动力学 (MD) 模拟来研究FL FUS.
- 两个现代FF (珀 ff03ws和 ff99SBws-STQ) 的比较.
- 进行了FL FUS凝结物的微秒时间尺度模拟.
主要成果:
- 两种FF都显示出相似的分子内相互作用概况,主要由内在无序区域 (IDR) 主导.
- 折叠域显示最小的域间相互作用,但它们的稳定性影响了链维度.
- 珀 ff99SBws-STQ FF与 ZAFF 债券参数改善了折叠域稳定性和链维度估计.
- 凝模拟显示了与稀释相行为相关的广泛的静电相互作用.
结论:
- 蛋白质折叠域稳定性和IDR相互作用对于调节FUS形状和相位分离至关重要.
- 这些发现促进了对FUS相关病理的分子理解.
- 这项研究有助于开发针对FUS相关疾病的向治疗方法.
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