Measurement of cGMP and Soluble Guanylyl Cyclase Activity
1999
Soluble guanylyl cyclase is responsible for synthesis of guanosine 3'5'-cyclic monophosphate. The enzyme is activated by NO, so measurement of tissue levels of cGMP and the activity of guanylyl cyclase is important in studies of NO-cGMP signal transduction. The method of choice for measuring tissue levels of cGMP is a radioimmunoassay, but it can also be measured using a scintillation proximity assay. Guanylyl cyclase activity is determined by measuring the conversion of GTP to cGMP using a radioimmunoassay or by following the conversion of [32P]GTP to [32P]cGMP, with separation of the product by precipitation and chromatography on an alumina column.
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