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Assay Method Information

Assay Name:  HTRF Assay
Description:  he UAE enzymatic reaction totals 50 μL and contains 50 mmol HEPES (pH 7.5), 0.05% BSA, 2.5 mM MgCl2, 0.1 uM ATP, 8 nM GST-Ubc-2, 35 nM flag-ubiquitin, 1 nM recombinant human UAE or mouse UAE. Compounds for this hUAE IC50 assay are tested at 10 point 3-fold dilution. The top concentration for this assay is 1 μM. Each compound is ordered in duplicate on the same plate. The enzymatic reaction mixture is incubated for 90 minutes at room temperature (24 degrees C.) in a 384 well plate prior to termination with a stop solution (0.1 M HEPES/0.05% Tween20, 20 mmol EDTA, 410 mM KF, 0.5 nM Eu Cryptate anti-FLAG M2-K antibody (Cis-bio International), 8 ug/mL Anti-GST XL-APC (Prozyme)). After incubation for 120 minutes, quantification of the FRET is performed on the Pherostar (BMG).From the Pherastar rawdata files, % inhibition vs. plate based controls is calculated. Dose response data is further processed in Genedata Condoseo, which performs as 4 parameter logistic fit and determines the IC50 (intercept at 50% inhibition) for each compound. The results are shown in the following table. For compounds whose values are marked with an asterisk (*), mouse UAE was used. For all other compounds, human UAE was used.
Affinity data for this assay
 

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Last update November 1, 2007
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