Assay Report Card

ID: ALA3888806

Type: Binding

Description: Time Resolved Fluorescence Energy Transfer (TR-FRET) Assay: Assay 1: This assay was used to evaluate compounds displaying inhibition of p53-MDM2 interaction and p53-MDM4 interaction at IC50s of 0.005 to 50 μM (p53-MDM2 Assay 1 and p53-MDM4 Assay 1, respectively). The test is performed in white 384-well plates (Greiner Bio-One, reference 781207) in a total volume of 60 μL by adding 1 μL of compounds tested at different concentrations diluted in 100% DMSO (1.7% final DMSO concentration) in reaction buffer (PBS, 125 mM NaCl, 0.001% Novexin (consists of carbohydrate polymers), designed to increase the solubility and stability of proteins; Expedeon Ltd., Cambridgeshire, United Kingdom), 0.01% Gelatin, 0.01% 0.2%, Pluronic F-127 (block copolymer from ethylenoxide and propyleneoxide), 1 mM DTT). After addition of 1.25 nM MDM2-biotinylated or 2.5 nM MDM4-biotinylated (internal preparations, both MDM2 and MDM4 are biotinylated at the C-terminal of the peptide construct), and 0.625 nM Europium labeled streptavidin (Perkin Elmer), the solution is pre-incubated for 15 minutes at room temperature, then 10 nM Cy5-p53 peptide (internal preparation, the Cy5 dye is directly bound to the N-terminal part of p53 peptide construct) is added before an incubation at room temperature for 15 minutes prior to reading the plate. For measurement of samples, a Victor II microplate reader (Perkin Elmer) is used with the following settings: Excitation 340 nm, Emission Donor 620 nm and Emission Acceptor 665 nm.