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| | Enzyme Inhibition Assay |
| Description: | The enzyme inhibition assays were performed using the luminometric methodology of kinase-Glo. The recombinant human GSK3 enzyme (catalogue no. 14-306) was acquired from Upstate (Dundee, UK). The prephosphorylated polypeptide was synthesised by American Peptide Inc. (Sunnyvale, Calif.). The luminescent kinase kit (catalogue no. V6711) was obtained from Promega. The ATP and the other reagents were purchased from Sigma-Aldrich (St. Louis, Mo.).The assays were performed in buffer using 96-well plates. 10.mu.l of the compound to be assayed (dissolved in DMSO at a concentration of 1 mM, and, in turn, dissolved in buffer to the concentration necessary for the experiment) and 10.mu.l (20 ng) of the enzyme are added to each well, followed by 20.mu.l of buffer containing 25.mu.M of the substrate and 1.mu.M of ATP. The final concentration of DMSO in the experiment did not exceed 1%. Following a half-hour incubation at 30.degree. C., the enzymatic reaction is stopped with 40.mu.l of the kinase-Glo reagent. The luminescence is measured after ten minutes, using a POLARstar Optima multimode reader. The activity is proportional to the difference between the total ATP and the ATP consumed. The inhibitory activities were calculated as a function of the maximum activity, measured in the absence of inhibitor. |
| Affinity data for this assay | |
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