||CBP (CREB-binding protein or CREBBP) functions as a histone acetyltransferase, catalyzing the transfer of an acetyl group from the cofactor acetylCoA to the ε-amine of a substrate lysine side chain. These acetylated lysine residues are recognized by bromodomains and play a critical role in the epigenetic regulation of gene transcription. CBP has also been shown to acetylate numerous non-histone proteins including various transcription factors and coactivators, some of which are related to several oncogenes and tumor suppressors. The CBP bromodomain TR-FRET Assay Kit is a homogeneous, TR-FRET assay method amenable to rapid characterization of inhibitors of bromodomain/acetylated peptide interaction in a high throughput format. This screening assay is robust, displaying a Z >0.6.