Acetyl-lysine binding site of bromodomain-containing protein 4 (BRD4) interacts with diverse kinase inhibitors

Stuart W.J. Ember, Jin Yi Zhu, Sanne H. Olesen, Mathew P. Martin, Andreas Becker, Norbert Berndt, Gunda I. Georg, Ernst Schonbrunn

Research output: Contribution to journalArticlepeer-review

128 Scopus citations

Abstract

Members of the bromodomain and extra terminal (BET) family of proteins are essential for the recognition of acetylated lysine (KAc) residues in histones and have emerged as promising drug targets in cancer, inflammation, and contraception research. In co-crystallization screening campaigns using the first bromodomain of BRD4 (BRD4-1) against kinase inhibitor libraries, we identified and characterized 14 kinase inhibitors (10 distinct chemical scaffolds) as ligands of the KAc binding site. Among these, the PLK1 inhibitor BI2536 and the JAK2 inhibitor TG101209 displayed strongest inhibitory potential against BRD4 (IC50 = 25 nM and 130 nM, respectively) and high selectivity for BET bromodomains. Comparative structural analysis revealed markedly different binding modes of kinase hinge-binding scaffolds in the KAc binding site, suggesting that BET proteins are potential off-targets of diverse kinase inhibitors. Combined, these findings provide a new structural framework for the rational design of next-generation BET-selective and dual-activity BET-kinase inhibitors.

Original languageEnglish (US)
Pages (from-to)1160-1171
Number of pages12
JournalACS Chemical Biology
Volume9
Issue number5
DOIs
StatePublished - May 16 2014

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