Absolute binding free energy calculations of CBClip host-guest systems in the SAMPL5 blind challenge.
Herein, we report the absolute binding free energy calculations of CBClip complexes in the SAMPL5 blind challenge. Initial conformations of CBClip complexes were obtained using docking and molecular dynamics simulations. Free energy calculations were performed using thermodynamic integration (TI) with soft-core potentials and Bennett's acceptance ratio (BAR) method based on a serial insertion scheme. We compared the results obtained with TI simulations with soft-core potentials and Hamiltonian replica exchange simulations with the serial insertion method combined with the BAR method. The results show that the difference between the two methods can be mainly attributed to the van der Waals free energies, suggesting that either the simulations used for TI or the simulations used for BAR, or both are not fully converged and the two sets of simulations may have sampled difference phase space regions. The penalty scores of force field parameters of the 10 guest molecules provided by CHARMM Generalized Force Field can be an indicator of the accuracy of binding free energy calculations. Among our submissions, the combination of docking and TI performed best, which yielded the root mean square deviation of 2.94 kcal/mol and an average unsigned error of 3.41 kcal/mol for the ten guest molecules. These values were best overall among all participants. However, our submissions had little correlation with experiments.
Laboratory of Computational Biology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, 20852, USA. juyong.lee@nih.gov.
Juyong
0000-0003-1174-4358
J
Lee
Laboratory of Computational Biology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, 20852, USA.
Florentina
F
Tofoleanu
Laboratory of Computational Biology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, 20852, USA.
Frank C
FC
Pickard
Laboratory of Computational Biology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, 20852, USA.
Gerhard
G
König
Laboratory of Computational Biology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, 20852, USA.|Department of Pharmaceutical Science, School of Pharmacy, University of Maryland, Baltimore, MD, 20852, USA.
Jing
J
Huang
Laboratory of Computational Biology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, 20852, USA.
Ana
A
Damjanović
Department of Chemistry, Seoul National University, Seoul, Republic of Korea.
Minkyung
M
Baek
Department of Chemistry, Seoul National University, Seoul, Republic of Korea.
Chaok
C
Seok
Laboratory of Computational Biology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD, 20852, USA.
Bernard R
BR
Brooks
D001665:Binding Sites; D015195:Drug Design; D006863:Hydrogen-Ion Concentration; D057927:Hydrophobic and Hydrophilic Interactions; D008024:Ligands; D008968:Molecular Conformation; D056004:Molecular Dynamics Simulation; D015394:Molecular Structure; D011485:Protein Binding; D011506:Proteins / Q000737:chemistry*; D012984:Software; D012997:Solvents / Q000737:chemistry*; D013816:Thermodynamics
D008024:Ligands; D011506:Proteins; D012997:Solvents
Absolute binding free energy calculation; Bennett’s acceptance ratio; Constant-pH simulation; Double decoupling scheme; Hamiltonian replica exchange; Host-guest complexes; Thermodynamic integration
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