| Assay Method Information | |
| | Fluorescence Anisotropy Binding Assay |
| Description: | Binding affinity of the newly synthesized compounds to the BRD4 BrD1 was assessed in a fluorescence anisotropy assay using a fluorescein isothiocyanate (FITC)-labeled MS417 as an assay probe (Zhang et al. 2008 op.cit.). Competition binding was performed with a BrD protein (0.25 to 1 μM) and the fluorescent probe (80 nM), and increasing concentration of unlabeled competing ligand in a PBS buffer (pH 7.4) in total volume of 80 μL. Measurements were obtained after 1 hour incubation of the fluorescent ligand and the protein at 25° C. with Safire 2 microplate reader (Tecan). In the assay, fluorescent ligand concentration was ≤2Kd, and protein concentration was set at which 50-80% of fluorescent ligand is bound. Dissociation constant of a competing ligand was calculated with the correction to Cheng-Prussoff equation introduced by Nicolovska-Coleska and colleagues [Nikolovska-Coleska, Z. et al., Anal Biochem 332, 261-273 (2004). |
| Affinity data for this assay | |
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