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Assay Method Information |
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| | Scintillation Proximity Assay |
| Description: | The assay method used was a scintillation proximity assay (SPA) (obtained from GE Healthcare, Product Code TRKQ7100), with [3H]-cGMP as the substrate (SPA manual, Amersham Biosciences). Purified human PDE7A and PDE7B (obtained from BPS Bioscience, San Diego, Calif.) were diluted and stored in a solution containing 25 mM Tris-Cl (pH 8.0), 100 mM NaCl, 0.05% Tween 20, 50% glycerol, and 3 mM DTT. PDE7 assays were carried out in the following reaction mixture (final concentrations): 50 mM Tris-Cl (pH 8.0), 8.3 mM MgCl2, 1.7 mM EGTA, 0.5 mg/ml BSA, 5% DMSO (except for OM056 which was in 2.5% DMSO) and 2 ng PDE7A or 0.2 ng PDE7B recombinant protein in a final volume of 0.1 mL. |
| Affinity data for this assay | |
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