| Assay Method Information | |
| | Kinase Activity Assay |
| Description: | First, 10 ng of recombinant CDK4/cyclin D1 (Life Technologies PV4204) was diluted in a kinase buffer (20 mM Tris pH7.5, 10 mM MgCl2, 0.01% NP-40, 2 mM DTT), and incubated at room temperature for 30 minutes together with indicated concentration of inhibitors. The kinase reaction was initiated by the addition of 1 μg (1.5 μM) of recombinant retinoblastoma protein, 5 μM ATP and 10μ Ci γ-32P-ATP. The reaction was incubated at 30° C. for 20 minutes, and the reaction was stopped by the addition of 2× Laemmli sample buffer, heated at 95° C. for three minutes, and dissolved in 12% acrylamide SDS-PAGE for autoradiography. The corresponding phosphorylated substrate protein bands were quantified using a densitometer (Bio-Rad). The resulting density values were plotted as a function of log drug concentration using Prism 4 Graphpad software, and IC50 values were determined by plotting a non-linear regression curve with a variable slope. The compounds disclosed herein were tested in a similar manner for their inhibitory activities against CDK6/cyclin D1, CDK2/cyclin A, CDK5/cyclin P25, CDK9/cyclin Ti, CDK7/cyclin H and CDK19/cyclin C. |
| Affinity data for this assay | |
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