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Assay Method Information

Assay Name:  Phosphodiesterase Assay
Description:  The PDE assay is based on the homogenous time-resolved fluorescence resonance energy transfer (TR-FRET) technology (LANCE® from Perkin Elmer). This competition based assay is formatted using a cAMP specific antibody labeled with the dye, Alexa Fluor® 647, biotin-cAMP and streptavidin labeled with Europium (Eu-SA). As the complex of Eu-SA/biotin-cAMP/Alexa Fluor 647 labeled antibody is formed, an increase in signal is generated. When there is PDE activity, resulting in the degradation of the cyclic nucleotide, the complex is not formed and a decrease in signal is observed. The phosphodiesterase assay was developed using the LANCE® cAMP kit (PerkinElmer). The assay buffer contained HBSS with 5 mM HEPES, 0.1% BSA, and 1.5 mM MgCl2, pH 7.4. PDE10A (BPS Bioscience) was used at 200 pg/well (with a specific activity of 3200 μmole/min/μg with assay conditions: 10 mM Tris-HCl, pH7.4, 10 mM MgCl2, 1 mM MnCl2, 200 μM cAMP, 2.5 kU 5′ nucleotidase, 37° C., 20 min). The Biotin-cAMP tracer, supplied in 10 mmol/L Tris-HCl buffered (pH 8.0) salt solution with 1 mmol/L ethylenediaminetetraacetic acid (EDTA), 0.1% bovine serum albumin (BSA), and 0.05% sodium azide, is used at a dilution of 1/375. The assay detection mixture contained the LANCE Eu-W8044 labeled streptavidin 1/2250 (supplied in 50 mmol/L Tris-HCl buffered (pH 7.8) salt solution with 0.9% sodium chloride (NaCl), 0.1% BSA, and 0.05% sodium azide) and the Alexa Fluor® 647-anti cAMP antibody 1/200 (supplied in 50 mmol/L Tris-HCl buffered (pH 7.8) salt solution with 0.9% NaCl, 0.1% BSA, and 0.05% sodium azide). Chemical compounds were dissolved in DMSO (final concentration 2% (v/v)). In a 384-well plate, 2 μL inhibitor and 3 μL PDE were added to the well, followed by the addition of 5 μl substrate biotinylated cAMP (1:5). After 60 min incubation at room temperature, 10 μL of assay detection mixture was added to the assay plate. After 1 h at room temperature, the signal was measured on EnVision¿ (Perkin Elmer).
Affinity data for this assay
 

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Last update November 1, 2007
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