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Assay Method Information

Assay Name:  Homogenous Time-Resolved Fluorescence Resonance Energy Transfer 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 pmole/min/ug with assay conditions: 10 mM Tris-HCl, pH7.4, 10 mM MgCl2, 1 mM MnCl2, 200 uM cAMP, 2.5 kU 5'nucleotidase, 37 C, 20 min).
Affinity data for this assay
 

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Last update November 1, 2007
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