Effect of steroid biosynthesis modifiers on progesterone biotransformation by recombinant yeasts expressing cytochrome P450cl7

  • V. M. Shkumatov
  • E. V. Usova
  • N. S. Frolova
  • G. Barth
  • S. Mauersberger
Experimental Studies
  • 57 Downloads

Abstract

Using recombinant microorganisms S. cerevisiae GRF18/YEp 5117α, expressing bovine adrenocortical cytochrome P450cl7, we have studied the effect of various modifiers of steroid biosynthesis on the relationship between reactions of the 17α-hydroxylation and 20α-reduction of progesterone. Dexamethasone and metyrapone had no effect on the reaction of progesterone 17α-hydroxylation and 20α-reduction of 17α-hydroxyprogesterone. Mifepriston and danazol did not covalently modify amino acid residues of the cytochrome P450cl7 or its heme group under the conditions of progesterone biotransformation by recombinant yeasts. Ketokonazole, mifepriston and danazol were found to be low-affinity competitive inhibitors, but the 20-dihydroderivatives of progesterone were mixed type inhibitors of the cytochrome P450cl7. All modifiers used did not affect the functional properties of the yeast analog of 20α-hydroxysteroid dehydrogenase. Based on the effect on catalytic parameters of the cytochrome P450cl7, the all modifiers used can be arranged in the following order: 20β-dihydroprogesterone (maximal effect) > mifepriston = ketokonazole > 20α-dihydroprogesterone > danazol > dexamethasone, metyrapone (without effect).

Key words

cytochrome P450cl7 17α-hydroxylation 20-reduction recombinant yeasts 

Abbreviations

C

competitive type

M

mixed type of inhibition

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Copyright information

© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  • V. M. Shkumatov
    • 1
  • E. V. Usova
    • 1
  • N. S. Frolova
    • 1
  • G. Barth
    • 2
  • S. Mauersberger
    • 2
  1. 1.Research Institute for Physico-Chemical ProblemsBelarussian State UniversityMinskBelarus
  2. 2.Institute of MicrobiologyDresden University of TechnologyDresdenGermany

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