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CHARMM-GUI Ligand Binder for Absolute Binding Free Energy Calculations and Its Application
Jo, Sunhwan Jiang, Wei Lee, Hui Sun Roux, Benoît Im, Wonpil
Jo, Sunhwan
Jiang, Wei
Lee, Hui Sun
Roux, Benoît
Im, Wonpil
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Abstract
Advanced free energy perturbation molecular dynamics (FEP/MD) simulation methods are available to accurately calculate absolute binding free energies of protein-ligand complexes. However, these methods rely on several sophisticated command scripts implementing various biasing energy restraints to enhance the convergence of the FEP/MD calculations, which must all be handled properly to yield correct results. Here, we present a user-friendly web interface, CHARMM-GUI Ligand Binder (http://www.charmm-gui.org/input/gbinding), to provide standardized CHARMM input files for calculations of absolute binding free energies using the FEP/MD simulations. A number of features are implemented to conveniently setup the FEP/MD simulations in highly customizable manners, thereby permitting an accelerated throughput of this important class of computations while decreasing the possibility of human errors. The interface and a series of input files generated by the interface are tested with illustrative calculations of absolute binding free energies of three non-polar aromatic ligands to the L99A mutant of T4 lysozyme and three FK506-related ligands to FKBP12. Statistical errors within individual calculations are found to be small (~1 kcal/mol), and the calculated binding free energies generally agree well with the experimental measurements and the previous computational studies (within ~2 kcal/mol). CHARMM-GUI Ligand Binder provides a convenient and reliable way to setup the ligand binding free energy calculations and can be applicable to pharmaceutically important protein-ligand systems.
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Date
2013-01-28
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American Chemical Society
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Keywords
Free energy perturbation, Molecular dynamics, Protein-ligand Interactions, T4 Lysozyme, FKBP12
Citation
Jo, S., Jiang, W., Lee, H. S., Roux, B., & Im, W. (2013). CHARMM-GUI Ligand Binder for Absolute Binding Free Energy Calculations and Its Application. Journal of Chemical Information and Modeling, 53(1), 267–277. http://doi.org/10.1021/ci300505n