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Evaluation of the ABCG2 Charge Model in Protein-Ligand Binding Free-Energy Calculations
Sudarshan Behera1, Vytautas Gapsys2, Bert L de Groot1
1Computational Biomolecular Dynamics Group, Max Planck Institute for Multidisciplinary Sciences, Göttingen 37077, Germany.
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Accurate binding free energy prediction is vital for drug design, motivating the assessment of new force field models. Here, we evaluate the ABCG2 charge model with nonequilibrium alchemical free-energy simulations. GAFF2/ABCG2 achieves higher hydration free energy accuracy but does not outperform GAFF2/AM1-BCC for protein-ligand binding free energy. Both charge models exhibit comparable accuracy and compound ranking across targets, indicating that property-specific force field optimization does not guarantee improved related-property performance.
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