CHEMBL5730176

AlphaScreen Assay: Experiments were performed in white opaque 384-well plates from PerkinElmer (Waltham, Mass.), and the samples were read on a Synergy 2 plate reader (Biotek, Winooski, Vt.) with a sensitivity setting of 200 using AlphaScreen protocol with excitation at 680 nm and emission at 570 nm. All dilutions were made in 1× assay buffer containing 25 mM HEPES (pH 7.4), 100 mMNaCl and 0.1% BSA to minimize nonspecific interactions. For inhibitor competition experiment, 5 nM of C-terminal biotinylated Tcf4 45-mer, 20 nM of N-terminal His6-tagged β-catenin and inhibitors at different concentration were incubated in 20 μL of assay buffer for 2 h. Donor and acceptor beads were added to a final concentration of 10 μg/mL in 25 μL of assay buffer. The mixture was incubated at room temperature for 1 h. For each inhibitor competition assay, the negative controls (equivalent to 0% inhibition) refer to 5.0 nM of biotinylated Tcf4 45-mer, 20 nM of β-catenin, 10 μg/mL donor and acce