Biochem/physiol Actions

GSK8814 is an aqueous soluble (>439 µM) inhibitor that targets ATAD2 & ATAD2B bromodomain (BD) with submicromolar affinity (pK_d = 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).