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Assay Method Information

Assay Name:  sGC Binding Assay
Description:  The binding potencies of sGC compounds to the human recombinant sGC enzyme were determined in a Size Exclusion Chromatography (SEC) competition binding assay using [3H] Ex-77B as the radioligand.[3H] Ex-77B was prepared using a standardardized tritium exchange procedure. The parent (non-labeled) molecule was first iodinated then a Pd-catalyzed iodine to tritium exchange provided the labeled compound.Method: The binding buffer was composed of 50 mM triethanolamine, pH 7.4, 3 mM MgCl2, 0.025% BSA, 2 mM dithiothreitol (DTT), 300 μM DETA/NO and 400 μM GTP. Assays were conducted in 96-well plates in a total volume of 200 μL. Recombinant human sGC protein (40 ng) was incubated with 1.6 nM [3H] Ex-77B for 24 hours at 37 C. in the presence and absence of various concentrations of sGC testing compounds delivered as DMSO solutions to give a total of 1% organic solvent content. Non-specific binding was defined by competition with 1 μM of Ex-77B. After the incubation period, the binding mixtures were loaded onto the gel-filtration plate (ThermoFischer Cat. No. 89808) pre-equilibrated with binding buffer and spun at 1000g for 3 min at 4 C. on a Bench top centrifuge. The collected eluates in White Frame Clear Well Isoplates (Perkin Elmer Cat #6005040) received 100 μl of UltimaGold scintillation cocktail. The sealed plates were shaken vigorously and span, and counted after 6 hours with a Wallac Microbeta TriLux 1450 LSC & Luminescence Counter (Perkin Elmer). Data from competition experiments were analyzed to determine Ki values using one site fit Ki equation.
Affinity data for this assay
 

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Last update November 1, 2007
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