CHEMBL5735975

Test for Evaluating the Inhibition of the Menin-MLL Binding: Menin1-615 wherein 6×His tag and HA tag are inserted in the N-terminus, and myc tag is inserted in the C-terminus (hereinafter, referred to as His-Menin1-615), is diluted with an assay buffer (25 mmol/L HEPES, 150 mmol/L NaCl, 1 mmol/L dithiothreitol, 0.5% (w/v) Tween 80, 0.3% (w/v) BSA, 0.3% (w/v) skim milk) to adjust the final concentration to 30 nmol/L. The test compounds are also diluted with the assay buffer to adjust each concentration of the test compounds to 0.005 to 5 μmol/L. The prepared His-Menin1-615 and test compounds were added to a light-shielding 384-well low-volume plate (Corning, #4514) in 2 μL/well and 6 μL/well, respectively, and the plate was covered with a lid for light-shielding (Corning, #3935), and incubated at room temperature for 3 hours. After the incubation, MLL1-172 wherein FLAG tag is inserted in the C-terminus (MLL1-172-FLAG), was separately diluted with the assay buffer to adjust the final concentration to 50 nmol/L. The prepared MLL1_172-FLAG was added to the above plate in 2 μL/well, and the plate was covered with a lid for light-shielding and incubated at room temperature for an hour.Then, anti-6HIS-d2 antibody (cisbio, 61HISDLA) and anti-FLAGM2-K antibody (cisbio, 61FG2KLA) were diluted with an antibody dilution buffer (50 mmol/L Tris, 150 mmnol/L NaCl, 800 mmnol/L KF, pH 7.4) to adjust the final concentration to 1.4 μg/mL to prepare an antibody mixture. The prepared antibody mixture was added to the above plate in 10 μL/well, and the plate was covered with a lid and incubated at 4° C. for 17 to 24 hours. After the incubation, the signal was detected with RUBYstar (BMG LABTECH). The binding inhibition rate (%) at each concentration of the test compounds was calculated from the following formula, and the IC50 value was obtained, that corresponds to the concentration of the test compound at which the binding inhibition rate is 50%.Binding inhibition rate (%)={1−(A−C)/(B−C)}×100A: Signal in the presence of test compoundB: Signal of negative control (in the absence of test compound)C: Signal of positive control (in the presence of known compound at the concentration which shows 100% inhibition ratio).