Accelerating the 3D reference interaction site model theory of molecular solvation with treecode summation and cut‐offs

Accelerating the 3D reference interaction site model theory of molecular solvation with treecode summation and cut‐offs
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使用树代码求和和截断加速分子溶剂化的 3D 参考相互作用位点模型理论

DOI:
10.1002/jcc.26889
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发表时间:
2022
影响因子:
3
通讯作者:
Luchko, Tyler
Luchko, Tyler
中科院分区:
化学3区
文献类型:
--
作者:
Wilson, Leighton;Krasny, Robert;Luchko, Tyler

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分子溶剂化的3D参考相互作用位模型(3D-RISM)是计算溶质分子周围溶剂(如水和共离子)的平衡热力学和密度分布的有力工具。然而,3D-RISM解决方案的计算成本可能很高,特别是对于蛋白质和其他大分子,计算溶质和溶剂之间的势能需要一半以上的计算时间。为了解决这个问题,我们开发并实现了针对长程相互作用的树形编码求和和针对短程相互作用的解析校正截止值,以加速AmberTools分子建模套件中非周期3D-rism中的势能和远程渐近计算。对于本文中考虑的最大单一蛋白质--微管蛋白,总计算时间减少了4倍。此外,这些新方法的并行计算几乎是线性的,迭代求解器仍然是并行缩放的最大障碍。为了证明我们的方法对大系统的有效性,我们使用3D-RISM计算了由910个微管二聚体组成的超过120万个原子的7环微管的溶剂化热力学和密度分布。
The 3D reference interaction site model (3D‐RISM) of molecular solvation is a powerful tool for computing the equilibrium thermodynamics and density distributions of solvents, such as water and co‐ions, around solute molecules. However, 3D‐RISM solutions can be expensive to calculate, especially for proteins and other large molecules where calculating the potential energy between solute and solvent requires more than half the computation time. To address this problem, we have developed and implemented treecode summation for long‐range interactions and analytically corrected cut‐offs for short‐range interactions to accelerate the potential energy and long‐range asymptotics calculations in non‐periodic 3D‐RISM in the AmberTools molecular modeling suite. For the largest single protein considered in this work, tubulin, the total computation time was reduced by a factor of 4. In addition, parallel calculations with these new methods scale almost linearly and the iterative solver remains the largest impediment to parallel scaling. To demonstrate the utility of our approach for large systems, we used 3D‐RISM to calculate the solvation thermodynamics and density distribution of 7‐ring microtubule, consisting of 910 tubulin dimers, over 1.2 million atoms.
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