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Improved convergence of binding affinities with free energy perturbation: Application to nonpeptide ligands with pp60src SH2 domain

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Abstract

Free Energy Perturbations (FEP) in the context of Monte Carlo (MC) simulations were conducted to predict the relative free energies of binding for a series of human Src SH2 domain ligands. Two procedures for disappearing atoms during a single-topology FEP are investigated and dramatic differences in free energy convergence behavior are seen. Comparison of these two protocols suggests that the coupling of the removal of angular constraints with the disappearance of an atom may significantly slow free energy convergence. The series of ligands under investigation here cover a range of modifications at the 3-position of 4-({[4-(cyclohexyl methoxy)benzyl]amino}carbonyl) phenyl phosphate. Unlike any other compound in this study, the 3-amide analog can form two hydrogen bonds within the region of the perturbation, one to a backbone amide hydrogen and one to a highly coordinated water molecule. Agreement with experimental trends in binding affinity is seen, although the computed relative free energy of binding of the amido compound is underestimated. These results are reconciled by examination of the hydration energies of model systems, which predict primary amides as too hydrophilic.

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  1. Department of Chemistry, Yale University, New Haven, CT, 06520-8107, U.S.A

    Daniel J. Price & William L. Jorgensen

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  1. Daniel J. Price
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Price, D.J., Jorgensen, W.L. Improved convergence of binding affinities with free energy perturbation: Application to nonpeptide ligands with pp60src SH2 domain. J Comput Aided Mol Des 15, 681–695 (2001). https://doi.org/10.1023/A:1012266200343

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