为什么这么多的融合原体是杆状的?
Ioana C Butu1, Jin Zeng1, Dong An1
1Department of Chemical Engineering, Columbia University, New York, NY 10027.
bioRxiv : the preprint server for biology
|July 9, 2025
概括
棒形分子融合原体利用热力驱动膜融合,这是细胞功能和病毒进入至关重要的过程. 这种在模拟中观察到的通用机制解释了在各种融合基因家族中保存的杆结构.
科学领域:
- 分子生物学分子生物学
- 生物物理学的生物物理.
- 细胞生物学 细胞生物学
背景情况:
- 分子融合原体对于各种生物过程至关重要,包括细胞贩运,细胞外,细胞融合和病毒进入.
- 许多融合原体,如SNARE蛋白和病毒糖蛋白,在不同的超级家族中共享一种保存的棒状形状.
研究的目的:
- 通过分子动力学 (MD) 模拟来研究棒状聚变剂的集体行为和聚变机制.
- 确定杆形状是否是融合活动的关键决定因素,并探索驱动膜融合的潜在力量.
主要方法:
- 采用高度粗粒度的分子动力学 (MD) 模拟来模拟长时间尺度上的棒状融合原体的行为.
- 模拟了各种类型的融合原体,包括SNARE复合物,II类EFF-1融合原体和模拟杆状复合物,将它们的融合途径与球状复合物进行比较.
主要成果:
- 棒状的融合剂产生了显著的热力,清除了聚变点,诱导了半聚变,并最终促进了膜破裂和聚变.
- 增加的核聚物密度与更高的热力和加速的核聚变速率相关,与实验观测一致.
- 模拟的棒状复合体,与球状复合体不同,始终通过类似的热路径驱动膜融合.
结论:
- 棒形状是产生驱动膜融合的热力的一个最佳结构特征.
- 一种普遍的,基于杆的膜融合机制可能是不同真核生物和病毒融合原体中观察到的结构融合的基础.
- 这些发现为管理膜融合和融合蛋白的演变的基本原则提供了洞察力.
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