Phosphodiesterases (PDEs) play an important role in the dynamic regulation of cAMP and cGMP signaling. PDE5A, also known as cGMP-inhibited phosphodiesterase, has been implicated in cardiovascular function and fertility. Phosphodiesterases catalyze the hydrolysis of the phosphodiester bond in dye-labeled cyclic monophosphates. Beads selectively bind the phosphate group in the nucleotide product. This increases the size of the nucleotide relative to unreacted cyclic monophosphate. In the polarization assay, dye molecules with absorption transition vectors parallel to the linearly-polarized excitation light are selectively excited. Dyes attached to the rapidly-rotating cyclic monophosphates will obtain random orientations and emit light with low polarization. Dyes attached to the slowly-rotating nucleotide-bead complexes will not have time to reorient and therefore will emit highly polarized light.
The PDE5A Assay Kit is designed for identification of PDE5A inhibitors using fluorescence polarization. The assay is based on the binding of a fluorescent nucleotide monophosphate generated by PDE5A to the binding agent. The key to the PDE5A Assay Kit is the specific binding agent. Using this kit, only two simple steps on a microtiter plate are required for PDE5A reactions. First, the fluorescently labeled cGMP is incubated with PDE5A for 1 hour. Second, the binding agent is added to the reaction mix to produce a change in fluorescent polarization that can then be measured using a fluorescence reader equipped for the measurement of fluorescence polarization.
Great for studying enzyme kinetics and screening small molecular inhibitors for drug discovery and HTS applications.
At least 6 months from date of receipt, when stored as directed. Kit components require different storage conditions. Be sure to store each component at the proper temperature upon arrival.
PDE5A: 1 µg; -80°C FAM-Cyclic-3′, 5′-AMP (20 µM): 50 µl; -80°C PDE assay buffer: 25 ml; -20°C Binding Agent: 100 µl; +4°C Binding Agent Diluent: 10 ml; +4°C Black, low binding, microtiter plate: 1; Room temp.