Aqueous soluble inhibitor that targets ATAD2 & ATAD2B bromodomain with high selectivity and submicromolar affinity.
GSK8814 is an aqueous soluble (>439 μM) inhibitor that targets ATAD2 & ATAD2B bromodomain (BD) with submicromolar affinity (pKd = 8.1 for ATAD2 by ITC) and high selectivity (pIC50 = 7.3/ATAD2 BD & 7.7/ATAD2B BD in competitive ligand binding assays by TR-FRET; pIC50 ≤4.5 when using BD1/BD2 of BRD2-4 or BRDT). When tested using intact cells, GSK8814 effectively disrupts histone H3.3 interaction with ATAD2 BD construct (IC50 = 2.7 μM), but not full-length ATAD2. GSK8814, but not its less active diastereomer GSK8815, is shown to suppress LNCaP colony formation in a soft agar assay, albeit with a high effective concentration (by 56% at 20 μM).
Angewandte Chemie (International ed. in English), 55(38), 11382-11386 (2016-08-18)
ATAD2 is a cancer-associated protein whose bromodomain has been described as among the least druggable of that target class. Starting from a potent lead, permeability and selectivity were improved through a dual approach: 1) using CF2 as a sulfone bio-isostere
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