蛋白质二次结构展开中的动态同位素效应:作为模型的Beta-Sheet多糖氨酸二次体的计算
Alexey O Yanshin1,2, Vitaly G Kiselev1,2, Alexey V Baklanov1
1Institute of Chemical Kinetics and Combustion SB RAS, 3 Institutskaya Street, Novosibirsk 630090, Russia.
Biomolecules
|January 25, 2025
概括
重同位素替代,特别是H/D,通过加强链间的键,显著稳定了蛋白质的二次结构. 这种效应即使在中等长的蛋白质链中也是显著的,为蛋白质折叠动态提供了洞察力.
科学领域:
- 计算化学是一种计算化学.
- 生物物理学的生物物理.
- 蛋白质科学是一种蛋白质科学.
背景情况:
- 蛋白质的二次结构稳定性对于功能至关重要.
- 二次结构的展开包括打破链间的键.
- 动态同位素效应 (KIE) 可以量化键强度的变化.
研究的目的:
- 在多聚甘氨酸解离过程中计算各种同位素替代的KIEs.
- 为了建模蛋白质二次结构通过β-sheet二分离体解离而展开.
- 评估同位素替代对链间键强度的影响.
主要方法:
- 对H/D,14N/15N,16O/18O和12C/13C替代的KIEs的计算计算.
- 模拟β叶多糖氨酸二聚体的解离.
- 使用"完全松散"过渡状态模型进行H/D KIE计算.
主要成果:
- 沉重的同位素替代增强了链间N-HO=C的键.
- 强化效应的顺序:H/D >> 14N/15N > 16O/18O > 12C/13C. 这种强化效应的顺序是:H/D >> 14N/15N > 16O/18O > 12C/13C.
- 对具有众多链间键的蛋白质观察到高H/D同位素效应.
- 在重同位素替代过程中,内部和外部键表现出相似的稳定效应.
结论:
- 沉重的同位素替代,特别是H/D,可以显著稳定蛋白质的二次结构.
- KIE是一个敏感的探测器,用于蛋白质展开中的链间键动态.
- 对内部和外围键的同位素作用有助于整体稳定性.
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