BI-9564 is a selective inhibitor of BRD9 and BRD7 bromodomains (Kds = 14.1 and 239 nM; IC50s = 75 nM and 3.4 μM, respectively) that demonstrates cellular activity by semi-quantitative FRAP assay with ~90% inhibition of BRD9 and BRD7 at 0.1 μM and 1 μM, respectively. It does not bind to other bromodomain-containing BET family members (IC50s >100 μM as assessed by AlphaScreen), kinases, or G protein-coupled receptors and shows off-target selectivity only to the CECR2 bromodomain in in vitro ITC assays (Kd = 258 nM), but not in cell-based assays at concentrations up to 1 μM. BI-9564 has been shown to inhibit the growth of EOL-1 AML cells both in vitro (EC50 = 800 nM) and in a disseminated mouse model of AML (180 mg/kg/day). See the Structural Genomics Consortium (SGC) website for more information.
