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arXiv 2104.01620physics.chem-ph
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使用自适应增强动力学的高维自由能景观的有效采样

Efficient sampling of high-dimensional free energy landscapes using adaptive reinforced dynamics

Dongdong Wang, Yanze Wang, Junhan Chang, Linfeng Zhang, Han Wang, Weinan E

摘要:

增强的采样方法,如元吸附和伞采样已成为探索分子和材料的配置空间的重要工具。与此同时,他们长期以来一直面临着一些问题,如处理大量集体变量(CV)或具有高自由能势垒的系统时的效率低下。在这项工作中,我们表明,与\redc{the clustering and adaptive tuning techniques},增强动力学(RiD)计划可以用来有效地探索配置空间和自由能景观与大量的CV或系统具有高自由能障碍。我们通过研究各种具有代表性和挑战性的例子来说明这一点。首先,我们证明了自适应RiD与其他方法相比的效率,并构建了9维自由能景观的类肽三聚体,具有超过8千卡/摩尔的能量障碍。然后,我们使用18个CV研究了蛋白质chignolin的折叠。在这种情况下,观察到折叠和解折叠速率均等于4.30~ $μs^{-1}$。最后,我们提出了一个基于RiD的蛋白质结构精化协议。该协议允许我们有效地使用100多个CV来探索蛋白质结构的景观,并且它比初始的全局距离测试-高准确度(GDT-HA)分数整体提高了14.6个单位。

英文摘要:

Enhanced sampling methods such as metadynamics and umbrella sampling have become essential tools for exploring the configuration space of molecules and materials. At the same time, they have long faced a number of issues such as the inefficiency when dealing with a large number of collective variables (CVs) or systems with high free energy barriers. In this work, we show that with \redc{the clustering and adaptive tuning techniques}, the reinforced dynamics (RiD) scheme can be used to efficiently explore the configuration space and free energy landscapes with a large number of CVs or systems with high free energy barriers. We illustrate this by studying various representative and challenging examples. Firstly we demonstrate the efficiency of adaptive RiD compared with other methods, and construct the 9-dimensional free energy landscape of peptoid trimer which has energy barriers of more than 8 kcal/mol. We then study the folding of the protein chignolin using 18 CVs. In this case, both the folding and unfolding rates are observed to be equal to 4.30~$μs^{-1}$. Finally, we propose a protein structure refinement protocol based on RiD. This protocol allows us to efficiently employ more than 100 CVs for exploring the landscape of protein structures and it gives rise to an overall improvement of 14.6 units over the initial Global Distance Test-High Accuracy (GDT-HA) score.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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