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arXiv 2205.08306physics.chem-phcs.LGq-bio.BM
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用于生物分子模拟的精确机器学习量子力学力场

Accurate Machine Learned Quantum-Mechanical Force Fields for Biomolecular Simulations

Google Research(谷歌研究院);Technische Universität Berlin(柏林工业大学);University of Luxembourg(卢森堡大学);Korea University(高丽大学);Max Planck Institute for Informatics(马克斯·普朗克信息学研究所);Berlin Institute for the Foundations of Learning and Data(柏林学习与数据基础研究所)
Oliver T. Unke, Martin Stöhr, Stefan Ganscha, Thomas Unterthiner, Hartmut Maennel, Sergii Kashubin, Daniel Ahlin, Michael Gastegger, Leonardo Medrano Sandonas, … 展开作者

Oliver T. Unke, Martin Stöhr, Stefan Ganscha, Thomas Unterthiner, Hartmut Maennel, Sergii Kashubin, Daniel Ahlin, Michael Gastegger, Leonardo Medrano Sandonas, Alexandre Tkatchenko, Klaus-Robert Müller

摘要:

分子动力学(MD)模拟允许对化学和生物过程的原子见解。精确的分子动力学模拟需要计算量很大的量子力学计算,实际上仅限于短时间尺度和少数原子。对于较大的系统,使用有效的,但可靠性低得多的经验力场。最近,机器学习力场(MLFF)作为执行MD模拟的替代手段出现,在数量级加速下提供与从头算方法相似的精度。到目前为止,MLFF主要捕获小分子或周期性材料中的短程相互作用,这是由于构建模型和获得大分子可靠参考数据的复杂性增加,其中长程多体效应变得重要。这项工作提出了一种通用的方法来构建准确的MLFF的大规模分子模拟(GEMS)的训练上的“自下而上”和“自上而下”的不同大小的分子片段,从中可以了解相关的物理化学相互作用。GEMS被应用于研究丙氨酸基肽和46-残基蛋白质crambin在水溶液中的动力学,允许在基本上从头算质量的纳秒尺度的MD模拟> 25 k原子。我们的研究结果表明,肽和蛋白质的结构基序比以前认为的更灵活,这表明从头计算的准确性模拟可能是必要的,以了解动态的生物分子过程,如蛋白质(错误)折叠,药物-蛋白质结合,或变构调节。

英文摘要:

Molecular dynamics (MD) simulations allow atomistic insights into chemical and biological processes. Accurate MD simulations require computationally demanding quantum-mechanical calculations, being practically limited to short timescales and few atoms. For larger systems, efficient, but much less reliable empirical force fields are used. Recently, machine learned force fields (MLFFs) emerged as an alternative means to execute MD simulations, offering similar accuracy as ab initio methods at orders-of-magnitude speedup. Until now, MLFFs mainly capture short-range interactions in small molecules or periodic materials, due to the increased complexity of constructing models and obtaining reliable reference data for large molecules, where long-ranged many-body effects become important. This work proposes a general approach to constructing accurate MLFFs for large-scale molecular simulations (GEMS) by training on "bottom-up" and "top-down" molecular fragments of varying size, from which the relevant physicochemical interactions can be learned. GEMS is applied to study the dynamics of alanine-based peptides and the 46-residue protein crambin in aqueous solution, allowing nanosecond-scale MD simulations of >25k atoms at essentially ab initio quality. Our findings suggest that structural motifs in peptides and proteins are more flexible than previously thought, indicating that simulations at ab initio accuracy might be necessary to understand dynamic biomolecular processes such as protein (mis)folding, drug-protein binding, or allosteric regulation.

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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