Folding and thermodynamic studies of Trp-cage based on polarized force field

Folding and thermodynamic studies of Trp-cage based on polarized force field
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基于极化力场的Trp-cage折叠及热力学研究

DOI:
10.1007/s00214-012-1168-0
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发表时间:
2012-03
影响因子:
1.7
通讯作者:
Zhang, Dawei
Zhang, Dawei
中科院分区:
化学4区
文献类型:
--
作者:
Yip, Yew Mun;Ho, Chun Ying;Zhang, John Z. H.;Zhang, Dawei

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利用两个复制交换分子动力学(REMD)模拟研究了基于新建立的极化蛋白特异性电荷(PPC)的20个残基色氨酸笼折叠的热力学。从一个完全扩展的构象开始,使用基于3步PPC更新的REMD成功采样了Trp-cage原生构象。然后,将得到的Trp-cage折叠构象用于计算PPC,并进行另一次REMD来探索Trp-cage的热力学稳定性。理论熔点Tmof≈325 K与实验熔点Tmof 315 K基本一致。这表明PPC正确地预测了温度依赖性。目前的研究提供了静电极化如何影响蛋白质折叠的直接证据。
Two replica exchange molecular dynamics (REMD) simulations were carried out to study the thermodynamics of a 20-residue Trp-cage folding based on a newly developed polarized protein-specific charge (PPC). Starting from a fully extended conformation, Trp-cage native conformation was successfully sampled using REMD based on a 3-step PPC update. Next, the obtained Trp-cage folded conformation was then used to calculate the PPC in which another REMD was performed to explore the thermodynamic stability of Trp-cage. The theoretical melting temperatureTmof ≈325 K was found to be in close agreement with experimental melting temperature,Tmof 315 K. This indicates that the PPC was correctly predicting the temperature dependence. The current study provides a direct proof of how electrostatic polarization affects protein folding.
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