| Assay Method Information | |
| | Stimulation of sGC Enzyme Activity |
| Description: | To carry out the assay, 29 μl of enzyme solution [0-10 nM soluble guanylate cyclase (prepared according to H nicka et al, J. Mol. Med. 77, 14-23 (1999)) in 50 mM TEA, 2 mM MgC2, 0.1% BSA (fraction V), 0.005% Brij , pH 7.5] are initially introduced into a microplate, and 1 μl of the substance to be tested (as a serially diluted solution in DMSO) is added. The mixture is incubated at room temperature for 10 min. Then 20 μl of detection mix [1.2 nM Firefly Luciferase (Photinus pyralis luciferase, Promega), 29 μM dehydroluciferin (prepared according to Bitler & McElroy, Arch. Biochem. Biophys. 72, 358 (1957)), 122 μM luciferin (Promega), 153 μM ATP (Sigma) and 0.4 mM DTT (Sigma) in 50 mM TEA, 2 mM MgCl2, 0.1% BSA (fraction V), 0.005% Brij , pH 7.5] are added. The enzyme reaction is started by adding 20 μl of substrate solution [1.25 mM guanosine 5′-triphosphate (Sigma) in 50 mM TEA, 2 mM MgC2, 0.1% BSA (fraction V), 0.005% Brij , pH 7.5] and measured continuously in a luminometer. The extent of the stimulation by the substance to be tested can be determined relative to the signal of the unstimulated reaction.The activation of haem-free guanylate cyclase is examined by addition of 25 μM of 1H-1,2,4-oxadiazolo[4,3-a]quinoxalin-1-one (ODQ) to the enzyme solution and subsequent incubation for 30 minutes and compared to the stimulation of the native enzyme. |
| Affinity data for this assay | |
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