CHEMBL5730078

Z'-LYTE Kinase Assay: The measurement of Btk enzyme inhibitory activity was performed using the following reagents: Z'-LYTE Kinase Assay Kit-Tyr 1 (containing Tyr 1 peptide, Thy 1 phospho-peptide, 5x kinase buffer, ATP, development reagent B, development buffer, and stop reagent), Tyr 1 peptide (Invitrogen), and Btk (Invitrogen) according to the instructions accompanying the kit.First 5 uL/well of either a solution prepared by diluting the test compound in dimethyl sulfoxide (DMSO) or DMSO alone was added to the wells of a 96-well assay plate together with 10 uL/well of substrate/enzyme mixture and allowed to react for 20 minutes at 30° C. The substrate/enzyme mixture solutions were prepared by dilution in kinase buffer (DL-dithiothreitol (DTT; 2.7 mM) and 1.33x kinase buffer) so that the final concentration of Tyr-1 peptide would be 4 uM, and the final concentration of Btk would be 5 nM. Next 5 uL/well of adenosine triphosphate was added (ATP; final concentration 36 uM).