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Studies on the 14α-hydroxylation of progesterone in mucor piriformis

Madyastha, KM and Joseph, Theresa (1993) Studies on the 14α-hydroxylation of progesterone in mucor piriformis. In: The Journal of Steroid Biochemistry and Molecular Biology, 45 (6). pp. 563-569.

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Official URL: http://dx.doi.org/10.1016/0960-0760(93)90173-T


Cell-free extracts with high 14?-hydroxylase activity were prepared from induced vegetative cell cultures of Mucor piriformis by grinding in potassium phosphate buffer (0.05 M, pH 8.0) containing glucose (0.25 M), KCl (1 mM), glutathione (1.0 mM) and glycerol (10%). Although the ideal pH for preparing the cell-free extract from vegetative cells was 8.0, the pH optimum of the hydroxylase was found to be 7.6. Microsomes (2.0 mg) prepared from the crude cell-free extract hydroxylated progesterone to 14?-hydroxyprogesterone in not, vert, similar60% yields in 30 min in the presence of NADPH and O2. Microsomes prepared from the uninduced cells did not contain any 14?-hydroxylase activity. The hydroxylase activity was inhibited to a significant extent by CO and p-chloromercuribenzoate whereas moderate inhibition was noticed in the presence of SKF-525A, metyrapone and N-methylmaleimideindicating the possible involvement of the cytochromeP-450 system in the reaction. The membrane bound hydroxylase was solubilized using Triton X-100 and the solubilized fraction contained nearly 35% of the original hydroxylase activity.

Item Type: Journal Article
Publication: The Journal of Steroid Biochemistry and Molecular Biology
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Department/Centre: Division of Chemical Sciences > Organic Chemistry
Date Deposited: 11 Mar 2011 07:16
Last Modified: 11 Mar 2011 07:16
URI: http://eprints.iisc.ac.in/id/eprint/35842

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