Abstract
The binding mode prediction is of great importance to structure-based drug design. The discrimination of various binding poses of ligand generated by docking is a great challenge not only to docking score functions but also to the relatively expensive free energy calculation methods. Here we systematically analyzed the stability of various ligand poses under molecular dynamics (MD) simulation. First, a data set of 120 complexes was built based on the typical physicochemical properties of drug-like ligands. Three potential binding poses (one correct pose and two decoys) were selected for each ligand from self-docking in addition to the experimental pose. Then, five independent MD simulations for each pose were performed with different initial velocities for the statistical analysis. Finally, the stabilities of ligand poses under MD were evaluated and compared with the native one from crystal structure. We found that about 94% of the native poses were maintained stable during the simulations, which suggests that MD simulations are accurate enough to judge most experimental binding poses as stable properly. Interestingly, incorrect decoy poses were maintained much less and 38–44% of decoys could be excluded just by performing equilibrium MD simulations, though 56–62% of decoys were stable. The computationally-heavy binding free energy calculation can be performed only for these survived poses.






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Acknowledgements
The authors are grateful to Dr. Satoshi Endo and Dr. Toshimasa Tanaka for careful reading of the manuscript and valuable suggestions and comments. The computational resources are supported by the K computer of the RIKEN Advanced Institute for Computational Science through the HPCI System Research project (Project ID: hp120013) and the TSUBAME Grid Cluster at the Global Scientific Information and Computing Center of Tokyo Institute of Technology, supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) Open Advanced Research Facilities Initiative (Project ID: 15IBD).
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Liu, K., Watanabe, E. & Kokubo, H. Exploring the stability of ligand binding modes to proteins by molecular dynamics simulations. J Comput Aided Mol Des 31, 201–211 (2017). https://doi.org/10.1007/s10822-016-0005-2
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DOI: https://doi.org/10.1007/s10822-016-0005-2