原生展开的蛋白质稳定性作为一个线圈到球体的过渡负责/水合空间
Henry S Ashbaugh1, Harold W Hatch
1Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, Louisiana 70118, USA. hanka@tulane.edu
Journal of the American Chemical Society
|June 26, 2008
概括
模拟显示,对比子对于维持未折叠和折叠蛋白质状态之间的稳定边界至关重要,模仿电荷/水合相关性. 显然包括 counterions 稳定排斥性静电相互作用,对于多构成至关重要.
科学领域:
- 蛋白质结构和内在无序的蛋白质.
- 计算生物物理学和分子动力学
背景情况:
- 电荷/水解相关性从经验上预测了基于残留物质的原生未折叠蛋白质序列.
- 这种相关性的成功依赖于链条长度的独立性,以区分扩展和紧的形状.
研究的目的:
- 通过在不同序列特性上的粗粒度模拟来研究多形状.
- 探索 counterions 在稳定蛋白质结构中的作用及其与现有相关性之间的关系.
主要方法:
- 广泛的模拟粗粒型聚,具有不同的疏水性,电荷和长度.
- 显式包含 counterions 来建模静电相互作用和凝结效应.
- 模拟结果与对比离子凝结的理论预测进行比较.
主要成果:
- 在序列组合空间中观察到线圈到球体的过渡,类似于电荷/水合相关性.
- 一个稳定的边界,独立于序列长度,只能通过明确的 counterions.
- 电流凝结定量稳定了球体表面的排斥性静电相互作用.
结论:
- 对于在多模型中实现序列长度独立的稳定性边界,对比子是必不可少的.
- 这些发现支持了对蛋白质折叠和内在无序蛋白质的静电相互作用和对电离子效应的重要性.
- 极简主义模型可以扩展到其他影响形态障碍的因素.
相关概念视频
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