Document Report Card

ID: ALA3414549

Journal: J Med Chem

Title: Structural investigation of B-Raf paradox breaker and inducer inhibitors.

Authors: Arora R, Di Michele M, Stes E, Vandermarliere E, Martens L, Gevaert K, Van Heerde E, Linders JT, Brehmer D, Jacoby E, Bonnet P.

Abstract: The V600E missense mutation in B-Raf kinase leads to an anomalous regulation of the MAPK pathway, uncontrolled cell proliferation, and initiation of tumorigenesis. While the ATP-competitive B-Raf inhibitors block the MAPK pathway in B-Raf mutant cells, they induce conformational changes to wild-type B-Raf kinase domain leading to heterodimerization with C-Raf causing a paradoxical hyperactivation of MAPK pathway. A new class of inhibitors (paradox breakers) has been developed that inhibit B-Raf(V600E) activity without agonistically affecting the MAPK pathway in wild-type B-Raf cells. In this study, we explore the structural, conformational, and cellular effects on the B-Raf kinase domain upon binding of paradox breakers and inducers. Our results indicate that a subtle structural difference between paradox inducers and breakers leads to significant conformational differences when complexed with B-Raf. This study provides a novel insight into the activation of B-Raf by ATP-competitive inhibitors and can aid in the design of more potent and selective inhibitors without agonistic function.

CiteXplore: 25611072

DOI: 10.1021/jm501667n