Improving performance of docking-based virtual screening by structural filtration
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In the current study an innovative method of structural filtration of docked ligand poses is introduced and applied to improve the virtual screening results. The structural filter is defined by a protein-specific set of interactions that are a) structurally conserved in available structures of a particular protein with its bound ligands, and b) that can be viewed as playing the crucial role in protein-ligand binding. The concept was evaluated on a set of 10 diverse proteins, for which the corresponding structural filters were developed and applied to the results of virtual screening obtained with the Lead Finder software. The application of structural filtration resulted in a considerable improvement of the enrichment factor ranging from several folds to hundreds folds depending on the protein target. It appeared that the structural filtration had effectively repaired the deficiencies of the scoring functions that used to overestimate decoy binding, resulting into a considerably lower false positive rate. In addition, the structural filters were also effective in dealing with some deficiencies of the protein structure models that would lead to false negative predictions otherwise. The ability of structural filtration to recover relatively small but specifically bound molecules creates promises for the application of this technology in the fragment-based drug discovery.
KeywordsDocking Focused library Fragment-based Structural filtration Virtual screening
We thank Val Kulkov (BioMolTech Corp) for revising the manuscript. Our special thanks to Prof. Viktor Gergel and Alexander Grishagin, the Center of Supercomputer Technologies of the N.I. Lobacevsky State University of Nizhni Novgorod, for our access to the high-performance computing cluster (Nizhni Novgorod segment of the SKIF-grid program). The work was supported by the Foundation of Assistance to Small Innovative Enterprises (Contract №7168/4935r)
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