| Assay Method Information | |
| | TR-FRET (Time-Resolved-Fluorescence Energy Transfer) Endpoint Assay |
| Description: | A 384-well microtiter Lance TR-FRET (time-resolved-fluorescence energy transfer) endpoint assay was used for CDK4/cyclin D1 kinase activity measurements. The same assay was used for IC50 determination of small molecule inhibitors. In general, the kinase reactions were carried out in 30 uL volumes in the reaction solution containing the following: 2 uL compound (in 20% DMSO), 18 uL CDK4/cyclin D1 in Assay Buffer (50 mM HEPES, pH 7.5, 5 mM MgCl2, 2 mM MnCl2, 1 mM DTT, 0.05% BSA, 0.02% Tween-20), 10 uL of the mixture of pRb152 and ATP. The final reaction mixture contains compound (inhibitor) with the concentration varying from 0.005-10 uM, 2% DMSO, 0.3 nM CDK4/cyclin D1, 175 nM pRb152, and 3 uM ATP (Amersham Pharmacia, Cat. No. 27-2056-01). All reactions were run at room temperature in 384-well white flat-bottom OptiPlates (Perkin Elmer, Cat. No. 6007290) for 60 min then were quenched by the addition of 10 uL of 120 mM EDTA. |
| Affinity data for this assay | |
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