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• W2091275803 endingPage "9113" @default.
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• W2091275803 abstract "The molecular mechanics Poisson−Boltzmann surface area (MM−PBSA) method combined with alanine-scanning mutagenesis is a very important tool for rational drug design. In this study, molecular dynamics (MD) and MM−PBSA were applied to calculate the binding free energy between the rat intestinal fatty acid binding protein (IFABP) and palmitic acid (PA) to gain insight to the interaction details. Equally spaced snapshots along the trajectory were chosen to perform the binding free energy calculation, which yields a result highly consistent with experimental value with a deviation of 0.4 kcal/mol. Computational alanine scanning was performed on the same set of snapshots by mutating the residues in IFABP to alanine and recomputing the ΔΔGbinding. By postprocessing a single trajectory of the wild-type complex, the average unsigned error of our calculated ΔΔGbinding is below 1.5 kcal/mol for most of the alanine mutations of the noncharged residues (67% in total). To further investigate some particular mutants, three additional dynamical simulations of IFABP Arg126Ala, Arg106Ala, and Arg106Gln mutants were conducted. Recalculated binding free energies are well consistent with the experimental data. Moreover, the ambiguous role of Arg106 caused by the free energy change of the opposite sign when it is mutated to alanine and glutamine respectively is clarified both structurally and energetically. Typically, this can be attributed to the partial electrostatic compensation mainly from Arg56 and the obvious entropy gain in Arg106Ala mutant while not in Arg106Gln mutant. The presented structural model of IFABP−PA complex could be used to guide future studies." @default.
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• W2091275803 date "2007-06-29" @default.
• W2091275803 modified "2023-10-11" @default.
• W2091275803 title "Molecular Insight into the Interaction between IFABP and PA by Using MM−PBSA and Alanine Scanning Methods" @default.
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• W2091275803 doi "https://doi.org/10.1021/jp0713763" @default.
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