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Docking of small ligand molecules in protein active sites is a very important and challenging problem in the structure-based drug design field. In this work we propose a Differential Evolution algorithm in conjunction with a multi-solution strategy for the flexible ligand docking problem. The proposed algorithm is evaluated on five highly flexible HIV-1 protease ligands, with known three-dimensional structures, having up to 19 conformational degrees of freedom. The docking results and comparison with classic Differential Evolution algorithm indicate that the incorporation of a multi-solution strategy in Differential Evolution algorithms is very promising and can significantly improve molecular docking accuracy.