Toward accurate relative energy predictions of the bioactive conformation of drugs

Journal of Computational Chemistry
Keith T ButlerXavier Barril

Abstract

Quantifying the relative energy of a ligand in its target-bound state (i.e. the bioactive conformation) is essential to understand the process of molecular recognition, to optimize the potency of bioactive molecules and to increase the accuracy of structure-based drug design methods. This is, nevertheless, seriously hampered by two interrelated issues, namely the difficulty in carrying out an exhaustive sampling of the conformational space and the shortcomings of the energy functions, usually based on parametric methods of limited accuracy. Matters are further complicated by the experimental uncertainty on the atomic coordinates, which precludes a univocal definition of the bioactive conformation. In this article we investigate the relative energy of bioactive conformations introducing two major improvements over previous studies: the use sophisticated QM-based methods to take into account both the internal energy of the ligand and the solvation effect, and the application of physically meaningful constraints to refine the bioactive conformation. On a set of 99 drug-like molecules, we find that, contrary to previous observations, two thirds of bioactive conformations lie within 0.5 kcal mol(-1) of a local minimum, with penaltie...Continue Reading

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Citations

Mar 25, 2010·Journal of Computer-aided Molecular Design·Austin B YongyeKarina Martínez-Mayorga
May 26, 2010·Journal of Computer-aided Molecular Design·Austin B YongyeKarina Martínez-Mayorga
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