Simple Entropy Terms for End-Point Binding Free Energy Calculations.
Simple Entropy Terms for End-Point Binding Free Energy Calculations.
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DOI:
10.1021/acs.jctc.8b00418
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发表时间:
2018-11-13
影响因子:
5.5
通讯作者:
Minh DDL
中科院分区:
文献类型:
--
作者:
Menzer WM;Li C;Sun W;Xie B;Minh DDL
We introduce a number of computationally inexpensive modifications to the MM/PBSA and MM/GBSA estimators for binding free energies, which are based on average receptor-ligand interaction energies in simulations of a noncovalent complex, to improve the treatment of entropy: second- and higher-order terms in a cumulant expansion and a confining potential on ligand external degrees of freedom. We also consider a filter for snapshots where ligands have drifted from the initial binding pose. The variations were tested on six sets of systems for which binding modes and free energies have previously been experimentally determined. For some datasets, none of the tested estimators led to results significantly correlated with measured free energies. In datasets with nontrivial correlation, a ligand RMSD cutoff of 3 Å and a second-order truncation of the cumulant expansion was found to be comparable or better than the average interaction energy by several statistical metrics.
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