Assay Report Card

ID: ALA3889200

Type: Binding

Description: Inhibtion Assay: The PDE assay medium consisted of (final concentrations); 50 mM Tris-HCL, pH 7.5; 8.3 mM MgCl2; 1.7 mM EGTA; 0.5 mg/mL bovine serum albumin; and substrate (H-cAMP or H-cGMP). The BSA was lyophilized powder, essentially fatty acid free, >=96% pure from Sigma (A6003). 89 ul of assay medium and 1 ul of Compound 1 in 100% DMSO were added to a 96-well SPA plate and incubated for 1 minute at 30° C. The assay was initiated by addition of 10 ul of PDE10, and incubated for 21 minutes. Then 50 ul of SPA beads were added and the plate was sealed, shaken, and incubated at room temperature for 1 hour. The plate was then counted in a Wallac 1450 Microbeta Trilux plate scintillation counter. For the PDE10 IC50 experiment, the substrate was 125 nM H-cGMP. For the selectivity experiments, the substrates were 37 nM H-cAMP for PDEs 3, 4, 7, and 8; and 37 nM H-cGMP for PDEs 1, 2, 5, 9, 10, and 11. In all cases substrate concentrations were below the KM. The consumption of substrate was less than 6%, indicating that substrate concentrations did not change appreciably during the assay.