使用蒙特卡洛采样,协同旋转和连续溶解的多折叠
Jakob P Ulmschneider1, William L Jorgensen
1Department of Chemistry, Yale University, New Haven, CT 06520-8107, USA.
Journal of the American Chemical Society
|February 12, 2004
概括
本研究介绍了蒙特卡洛模拟的高效算法,以准确预测多折叠,包括β-hairpins和alpha-helices. 该方法成功地复制了实验结构和构造偏好,验证了其在探索构造空间方面的有效性.
科学领域:
- 计算化学是一种计算化学.
- 统计力学就是统计力学.
- 生物物理学的生物物理.
背景情况:
- 预测蛋白质结构对于理解生物功能至关重要.
- 需要准确的计算方法来探索复杂的结构景观.
- 现有的模拟方法在有效采样相关蛋白质构造方面面临挑战.
研究的目的:
- 为蒙特卡洛模拟开发和应用一个高效的协同旋转算法.
- 准确预测多的原生折叠,包括β-hairpins和α-helices.
- 验证算法的能力,以采样相关的构造空间和复制实验结构.
主要方法:
- 在蒙特卡洛模拟中利用了一种高效的协同旋转算法.
- 集成的灵活键和二面角与高斯偏差用于优化采样.
- 在水中的溶解中采用了通用的Born表面积 (GBSA) 模型.
- 使用OPLS-AA力场进行分子力学计算.
主要成果:
- 成功折叠了三种多:U(1-17) T9D,alpha(1) 和trpzip2.
- 两个β-hairpins的计算最低能量结构与NMR数据密切匹配.
- 对于α(1) ,预测偏好随机卷轴结构,与低度NMR实验保持一致.
- 证明了对构造空间的有效采样,从扩展构造中定位原生状态.
结论:
- 开发的算法高效地为聚酸折叠模拟进行构造空间样本.
- 该方法准确地预测了β-hairpins的原生结构和alpha-helices的结构偏好.
- OPLS-AA力场和GBSA溶剂模型的组合对β转形成的性能很好.
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