Structural and biophysical insights into the mode of covalent binding of rationally designed potent BMX inhibitors

Literature Information

Publication Date 2020-08-28
DOI 10.1039/D0CB00033G
Impact Factor 0
Authors

João D. Seixas, Marta C. Marques, Ana Guerreiro, Rui Traquete, Tiago Rodrigues, Inês S. Albuquerque, Di Wu, Shelby K. Doyle, Carol V. Robinson, Angela N. Koehler, Francisco Corzana


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Abstract

The bone marrow tyrosine kinase in chromosome X (BMX) is pursued as a drug target because of its role in various pathophysiological processes. We designed BMX covalent inhibitors with single-digit nanomolar potency with unexploited topological pharmacophore patterns. Importantly, we reveal the first X-ray crystal structure of covalently inhibited BMX at Cys496, which displays key interactions with Lys445, responsible for hampering ATP catalysis and the DFG-out-like motif, typical of an inactive conformation. Molecular dynamic simulations also showed this interaction for two ligand/BMX complexes. Kinome selectivity profiling showed that the most potent compound is the strongest binder, displays intracellular target engagement in BMX-transfected cells with two-digit nanomolar inhibitory potency, and leads to BMX degradation PC3 in cells. The new inhibitors displayed anti-proliferative effects in androgen-receptor positive prostate cancer cells that where further increased when combined with known inhibitors of related signaling pathways, such as PI3K, AKT and Androgen Receptor. We expect these findings to guide development of new selective BMX therapeutic approaches.

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Source Journal

RSC Chemical Biology

RSC Chemical Biology
CiteScore: 0
Self-citation Rate: 0%
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