1. Insight into the Binding of DFG-out Allosteric Inhibitors to B-Raf Kinase Using Molecular Dynamics and Free Energy Calculations.
- Author
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Coronel L, Granadino-Roldán JM, Pinto M, Tomas MS, Pujol MD, and Rubio-Martinez J
- Subjects
- Animals, Computer-Aided Design, Databases, Protein, Humans, Hydrogen Bonding, Melanoma genetics, Molecular Dynamics Simulation, Point Mutation, Protein Binding, Proto-Oncogene Proteins B-raf chemistry, Proto-Oncogene Proteins B-raf genetics, Proto-Oncogene Proteins B-raf metabolism, Thermodynamics, Allosteric Regulation drug effects, Drug Design, Melanoma drug therapy, Melanoma enzymology, Protein Kinase Inhibitors chemistry, Protein Kinase Inhibitors pharmacology, Proto-Oncogene Proteins B-raf antagonists & inhibitors
- Abstract
B-Raf mutations are identified in 40-50% of patients with melanoma and among them, the substitution of valine for glutamic acid at position 600 ((V600E)B-Raf) is the most frequent. Treatment of these patients with B-Raf inhibitors has been associated with a clear clinical benefit. Unfortunately, multiple resistance mechanisms have been identified and new potent and selective inhibitors are currently needed. In this work, five different type II inhibitors, which bind (V600E)B-Raf in its DFG-out conformation, have been studied using molecular dynamics, free energy calculations and energy decomposition analysis. The ranking of calculated MM-PB/GBSA binding affinities is in good agreement with the experimentally measured ones. The per-residue decomposition of ΔGbinding, within the MM-GBSA approach, has been used to identify the key residues governing the allosteric binding of the studied compounds to the (V600E)B-Raf protein kinase. Results indicate that although van der Waals interactions are key determinants for binding, hydrogen bonds also play an important role. This work also provides a better structural understanding of the binding of DFG-out inhibitors to (V600E)B-Raf, which can be used in a further step for rational design of a new class of B-Raf potent inhibitors.
- Published
- 2015
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