CHEMBL5731409

Aurora A Inhibition Assay: For in vitro method for measuring the inhibitory activity of the aforementioned compounds on the aurora A kinase activity was carried out referring to the method described in JP-A-2008-81492. As the first step of measuring the inhibitory activity of the compound, the test compound was serially diluted with dimethyl sulfoxide (DMSO). Subsequently, purified human aurora A protein, FL-Peptide 21 (Caliper Life Sciences, Inc., a final concentration of 100 nM), ATP (a final concentration of 5 μM), and the solution of the compound of the present invention in DMSO (a final DMSO concentration of 5%) were added to a reaction buffer [50 mM Tris-hydrochloric acid buffer (pH 7.4), 15 mM magnesium acetate, and 0.2 mM ethylenediamine-N, N, N′, N′-tetraacetic acid (EDTA)]. Then, the resulting mixture was incubated at 25° C. for 50 minutes to carry out kinase reactions. Then, the IMAP® Progressive Binding Reagent diluted 500-fold with the IMAP® Progressive Binding Buffer A (the product of Molecular Devices, LLC.) was added thereto to terminate the kinase reaction. After leaving the resulting product to stand in the dark at room temperature for 120 minutes, the amount of phosphorylation was determined from the degree of fluorescence polarization as measured by the PHERAstar (BMG LABTECH, excitation wavelength of 485 nm, detection wavelength of 520 nm). Then, the concentration of the compound at which the phosphorylation reaction can be inhibited by 50% was defined as the IC50 value (nM).