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arXiv 2402.01508physics.chem-phphysics.bio-phphysics.comp-ph
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用于增强采样分子动力学的深度学习类路径集合变量

Deep learning path-like collective variable for enhanced sampling molecular dynamics

Thorben Fröhlking, Luigi Bonati, Valerio Rizzi, Francesco Luigi Gervasio

AI总结:

本研究提出名为DeepLNE的新型类路径集合变量,结合可微广义自动编码器与连续k近邻选择,无需预定义界标即可学习反应路径,在玩具模型和RNA四环模拟中实现了增强采样与自由能收敛。

摘要:

多种增强采样技术依赖集合变量的定义来有效探索自由能面。现有描述反应路径进程的变量虽提供了精妙的解决方案,但仍存在诸多局限。本文中,我们通过引入一种名为“Deep-locally-non-linear-embedding(深度局部非线性嵌入)”的新型类路径集合变量来应对这些挑战,该变量受局部线性嵌入技术原理启发,在反应轨迹上训练得到。该变量通过结合神经网络与连续k近邻选择的可微广义自动编码器,自动生成特征的非线性组合,以此模拟理想反应坐标。该方法的核心优势之一是能够自动选择搜索近邻的度量标准,且无需预先手动选取界标,即可学习从状态A到状态B的路径。我们通过在Müller-Brown势、丙氨酸二肽等玩具模型中验证,该路径变量上的进程与理想反应坐标高度近似,证明了DeepLNE的有效性。随后我们将其应用于RNA四环的分子动力学模拟,展现了其加速构象转变、使折叠自由能收敛的能力。

英文摘要:

Several enhanced sampling techniques rely on the definition of collective variables to effectively explore free energy landscapes. Existing variables that describe the progression along a reactive pathway offer an elegant solution but face a number of limitations. In this paper, we address these challenges by introducing a new path-like collective variable called the `Deep-locally-non-linear-embedding', which is inspired by principles of the locally linear embedding technique and is trained on a reactive trajectory. The variable mimics the ideal reaction coordinate by automatically generating a non-linear combination of features through a differentiable generalized autoencoder that combines a neural network with a continuous k-nearest-neighbor selection. Among the key advantages of this method is its capability to automatically choose the metric for searching neighbors and to learn the path from state A to state B without the need to handpick landmarks a priori. We demonstrate the effectiveness of DeepLNE by showing that the progression along the path variable closely approximates the ideal reaction coordinate in toy models such as the Müller-Brown-potential and alanine dipeptide. We then use it in molecular dynamics simulations of an RNA tetraloop, where we highlight its capability to accelerate transitions and converge the free energy of folding.

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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