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Assay Method Information

Assay Name:  Enzyme Activity Assay
Description:  Complementary assays were utilized for the quantitative comparison of compound activity data for CYP17A1 and CYP21A2. Progesterone is a substrate for both CYP17A1 and CYP21A2, and was the substrate studied for enzyme activity, IC50 determinations, and selectivity comparison. Two methods for detecting enzymatic activity were utilized. Analytical High Pressure Liquid Chromatography (HPLC) for biochemical assays was performed on a Prominence HPLC system (Shimadzu Scientific Instruments, Inc., Columbia, Md.) equipped with a C18 reverse phase 100 mm Luna Column (Phenomenex, Torrance, Calif.). The mobile phase consisted of 40% acetonitrile, 59% water, and 1% acetic acid with a 1 mL/min flow rate at 40 C. An injection volume of 32 μL (CYP17A1) or 45 μL (CYP21A2) was used. The presence of the CYP17A1 product 17α-hydroxyprogesterone was detected with an absorption wavelength of 248 nm as reported by Devore, N. M.; Scott, E. E. Structure and function of human cytochromes P450 enzymes: Xenobiotic metabolism by CYP2A and steroid biosynthesis by CYP17A1. University of Kansas, Lawrence, K S, 2011. The presence of the CYP21A2 product 21-hydroxyprogesterone was detected with an absorption wavelength of 248 nm.
Affinity data for this assay
 

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Last update November 1, 2007
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