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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Implementation of a protein reduced point charge model toward molecular dynamics applications
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Implementation of a protein reduced point charge model toward molecular dynamics applications

机译:蛋白质还原点电荷模型在分子动力学应用中的实现

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A reduced point charge model was developed in a previous work from the study of extrema in smoothed charge density distribution functions generated from the Amber99 molecular electrostatic potential. In the present work, such a point charge distribution is coupled with the Amber99 force field and implemented in the program TINKER to allow molecular dynamics (MD) simulations of proteins. First applications to two polypeptides that involve α-helix and β-sheet motifs are analyzed and compared to all-atom MD simulations. Two types of coarse-grained (CG)-based trajectories are generated using, on one hand, harmonic bond stretching terms and, on the other hand, distance restraints. Results show that the use of the unrestrained CG conditions are sufficient to preserve most of the secondary structure characteristics but restraints lead to a better agreement between CG and all-atom simulation results such as rmsd, dipole moment, and time-dependent mean square deviation functions.
机译:在以前的工作中,由Amber99分子静电势产生的平滑电荷密度分布函数的极值研究开发了减少点电荷模型。在当前的工作中,这种点电荷分布与Amber99力场耦合并在TINKER程序中实现,以允许对蛋白质进行分子动力学(MD)模拟。分析了涉及两个包含α-螺旋和β-折叠基序的多肽的首次应用,并将其与全原子MD模拟进行了比较。一方面使用谐波键拉伸项,另一方面使用距离约束来生成两种基于粗粒(CG)的轨迹。结果表明,使用不受约束的CG条件足以保留大多数二级结构特征,但约束条件使CG与所有原子模拟结果(如rmsd,偶极矩和随时间变化的均方偏差函数)之间的一致性更好。

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