Abstract
Here is reported the development of a novel scoring function that performs remarkably well at identifying the native binding pose of a subset of HSP90 inhibitors containing aminopyrimidine or resorcinol based scaffolds. This scoring function is called PocketScore, and consists of the interaction energy between a ligand and three residues in the binding pocket: Asp93, Thr184 and a water molecule. We integrated PocketScore into a molecular docking workflow, and used it to participate in the Drug Design Data Resource (D3R) Grand Challenge 2015 (GC2015). PocketScore was able to rank 180 molecules of the GC2015 according to their binding affinity with satisfactory performance. These results indicate that the specific residues considered by PocketScore are determinant to properly model the interaction between HSP90 and its subset of inhibitors containing aminopyrimidine or resorcinol based scaffolds. Moreover, the development of PocketScore aimed at improving docking power while neglecting the prediction of binding affinities, suggesting that accurate identification of native binding poses is a determinant factor for the performance of virtual screens.
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Acknowledgments
I thank Pedro A. Fernandes and António J. M. Ribeiro for critical reading of the manuscript, Maria João Ramos for providing all the material and intellectual conditions that supported this work, and Fundação para a Ciência e Tecnologia for scholarship SFRH/BD/84922/2012
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Santos-Martins, D. Interaction with specific HSP90 residues as a scoring function: validation in the D3R Grand Challenge 2015. J Comput Aided Mol Des 30, 731–742 (2016). https://doi.org/10.1007/s10822-016-9943-y
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DOI: https://doi.org/10.1007/s10822-016-9943-y