| Assay Method Information | |
| | Phosphodiesterase 10 (PDE10) Enzyme Activity Assay |
| Description: | PDE10A1 enzyme activities are measured with a yittrium silicate based scintillation proximity assay (SPA) that detects radioactive nucleotide monophosphates but not cyclic monophosphates. The assay buffer is composed of 50 mM Tris-HCl pH 7.5, 8 mM MgCl2, 3.4 mM EDTA, and 0.1% BSA (Sigma). Assays are conducted in 384 well plates (3706, Corning) in a total volume of 50 μl: comprised of 24 μl PDE10A1 enzyme, 1 μl test compound and 25 μl of cyclic nucleotide. Test compounds are diluted in pure DMSO using ten-point concentration response curves with a 3-fold dilution factor and 1 μl is acoustically dispensed into assay plates using the Echo555 (LabCyte). 24 μl PDE10A1 protein is incubated with 1 μl compound for 30 min before the reaction is started by the addition of [8-3H]-cGMP substrate (6.5 Ci/mmol, Perkin Elmer). Final concentration of components is 70 μM PDE10A1, 80 nM (3H-cGMP), and 2% DMSO in assay buffer. Maximal compound concentration in the reaction mixture is 10 μM. Reactions are incubated for 60 min at RT before quenching and the addition of 400 mg/per well SPA beads (RPNQ0150, Perkin Elmer). Bead bound radioactivity (product) is quantified 12 h later with a Microbeta counter (Perkin Elmer). Data is normalized to % inhibition and IC50 values are calculated using the 4 parameter logistic equation as described (Campbell R. M.; Dymshitz, J.; Eastwood, B. J.; et al. Data Standardization for Results Management. In: Sittampalam, G. S.; Grossman, A.; Brimacombe, K.; et al.; eds.<i>Assay Guidance Manual. Bethesda (Md.): Eli Lilly & Company and the National Center for Advancing Translational Sciences; 2004.). |
| Affinity data for this assay | |
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