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- W1985501097 abstract "A sensitive alpha-amidating enzyme (alpha AE) assay using C-terminal glycine-extended substance P (SP-Gly) as a substrate was developed. The product, substance P (SP), was measured by a radioimmunoassay with specific polyclonal antibodies which recognize SP with an affinity 10,000-fold higher than that of SP-Gly. The sensitivity of the radioimmunoassay was 5 fmol. Enzyme activity could be readily detected with 25 ng alpha AE partially purified from the conditioned medium of rat medullary thyroid carcinoma CA-77 cells. The Km and Vmax values were 2.0 +/- 0.2 microM and 1.7 +/- 0.1 nmol/mg/min (mean +/- SE, n = 3), respectively. The assay enabled the kinetic characterization of alpha AE from a single rat pituitary homogenate. Optimal Cu2+ required was 30 microM and greater than 3 mM of ascorbate was needed for maximal enzyme activity. The sensitivity of this assay will aid efforts to examine the regulation of in vivo alpha AE activity." @default.
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- W1985501097 date "1990-03-01" @default.
- W1985501097 modified "2023-09-24" @default.
- W1985501097 title "A radioimmunoassay for measuring α-amidating enzyme activity" @default.
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- W1985501097 doi "https://doi.org/10.1016/0003-2697(90)90282-e" @default.
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