title: Lanosterol 14alpha-demethylase. Similarity of the enzyme system from yeast and rat liver.
abstract: The chemical synthesis of 24,25-dihydro[32-14C]lanosterol is described. The incubation of this material with a cell-free system from Saccharomyces cerevisiae or with a microsomal preparation from rat liver resulted in both cases in the release of [14C]formic acid. This result suggests that in the biosynthesis of ergosterol in yeast, as well as in that of cholesterol in higher animals, the 14alpha-methyl group of lanosterol is removed as formic acid. In both systems, the measurement of the rate of release of [14C]formic acid from 24,25-dihydro[32-14C]lanosterol provides a simple and direct assay of lanosterol 14alpha-demethylase. Carbon monoxide inhibited both yeast and liver 14alpha-demethylase.
mesh_terms: D000818:Animals; D002248:Carbon Monoxide / Q000494:pharmacology; D055598:Chemical Phenomena; D002621:Chemistry; D002784:Cholesterol / Q000096:biosynthesis; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism; D004875:Ergosterol / Q000096:biosynthesis; D005561:Formates / Q000378:metabolism; D066298:In Vitro Techniques; D007700:Kinetics; D007810:Lanosterol / Q000378:metabolism*; D008862:Microsomes, Liver / Q000201:enzymology*; D010088:Oxidoreductases / Q000378:metabolism*; D051381:Rats; D012441:Saccharomyces cerevisiae / Q000201:enzymology*; D013045:Species Specificity
chemical_list: D005561:Formates; D007810:Lanosterol; D002248:Carbon Monoxide; D003577:Cytochrome P-450 Enzyme System; D002784:Cholesterol; D010088:Oxidoreductases; D004875:Ergosterol