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Converging a Knowledge-Based Scoring Function: DrugScore2018.
Journal of Chemical Information and Modeling 2018 December 5
We present DrugScore2018, a new version of the knowledge-based scoring function DrugScore, which builds upon the same formalism used to derive DrugScore, but exploits a training data set of nearly 40,000 X-ray complex structures, a highly diverse and the by far largest dataset ever used for such an endeavour. About 2.5 times as many pair potentials than before now have a data basis required to yield smooth potentials, and pair potentials could now be derived for eight more atom types, including interactions involving halogen atoms and metal ions highly relevant for medicinal chemistry. Probing for dependence on training data set size and quality, we show that DrugScore2018 potentials are converged. We evaluated DrugScore2018 in comprehensive scoring, ranking, docking, and screening tests on the CASF-2013 dataset, allowing for a comparison with >30 other scoring functions. There, DrugScore2018 showed similar or improved performance in all aspects when compared to either DrugScore, DrugScoreCSD, or DSX and was, overall, the scoring function showing a most consistently good performance in scoring, ranking, and docking tests. Applying DrugScore2018 as objective function in AutoDock3 in a large-scale docking trial, using 4,056 protein-ligand complexes from PDBbind 2016, reproduced a docked pose to within 2 Å RMSD to the crystal structure in >75% of all dockings. These results are remarkable as the DrugScore2018 potentials were derived from crystallographic information only, without any further adaptation using binding affinity or docking decoy data. DrugScore2018 should thus be a competitive scoring and objective function for structure-based ligand design purposes.
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