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| | Fluorescent Polarization Assay |
| Description: | The activity of the compounds described in the present invention can be determined by measuring the phosphorylation of a fluorescently-labeled peptide by human CDK9/CyclinT kinase complex by fluorescent polarization using a commercially available IMAP Screening Express Assay Kit (Molecular devices).Test compounds were diluted in 100% DMSO to 5 mM stock concentration, then further dilutions were made in H2O or 100% DMSO to desirable concentrations. Each reaction consisted of 5 nM enzyme: CDK9/CyclinT (Proqinase cat#0371-0345-1), 400 nM TAMRA-Rbtide (synthetic 15-mer peptide derived from human retinoblastoma tumor suppressor protein labeled with TAMRA dye, Genecust Europe), 12 μM ATP (=Kmapp, Sigma-Aldrich) and kinase buffer: 20 mM MOPS pH 7 (Sigma-Aldrich), 1 mM DTT (Sigma-Aldrich), 10 mM MgCl2 (Sigma-Aldrich), 0.01% Tween 20 (Sigma-Aldrich).For each reaction, 4 or 6 μl containing TAMRA-Rbtide, ATP and kianse buffer were combined with 2 μl diluted compound in H2O or 0.028 μl compound in 100% DMSO. The kinase reaction was started by the addition of 2 μl diluted enzyme. |
| Affinity data for this assay | |
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