| Assay Method Information | |
| | Kinase Assay |
| Description: | The CDK4 and CDK1 inhibitory activity of the CDK4/6-FLT3 inhibitors was determined with a filtration kinase assay. The compounds, kinase and substrate diluted in the kinase buffer (20 mM Tris, pH7.4, 50 mM NaCl, 1 mM DTT, 0.1% BSA) were sequentially added to a 96-well Multiscreen HTS filtration plate (Millipore). The final 100 μL reaction mixture in each well contained 0.3 μg of CDK4/Cyclin D1 or CDK1/Cyclin B (Cell Signaling Technology), 1 μg of Rb fragment (aa773-928, Millipore) for the CDK4 assay or 5 μg of histone H1 for the CDK1 assay and 1 μCi of [33P]-ATP. The mixture was incubated at room temperature for 1 hour. The proteins in the reaction were then precipitated and washed with cold TCA solution using an aspiration/filtration vacuum system. The plates were dried at room temperature, and the retained radioactivity was measured by scintillation counting. |
| Affinity data for this assay | |
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