Steroid 9alpha-monooxygenase

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In enzymology, a steroid 9alpha-monooxygenase (EC 1.14.99.24) is an enzyme that catalyzes the chemical reaction

pregna-4,9(11)-diene-3,20-dione + AH2 + O2 \rightleftharpoons 9,11alpha-epoxypregn-4-ene-3,20-dione + A + H2O

The 3 substrates of this enzyme are pregna-4,9(11)-diene-3,20-dione, AH2, and O2, whereas its 3 products are 9,11alpha-epoxypregn-4-ene-3,20-dione, A, and H2O.

This enzyme belongs to the family of oxidoreductases, specifically those acting on paired donors, with O2 as oxidant and incorporation or reduction of oxygen. The oxygen incorporated need not be derive from O miscellaneous. The systematic name of this enzyme class is steroid,hydrogen-donor:oxygen oxidoreductase (9-epoxidizing). This enzyme is also called steroid 9alpha-hydroxylase. It has 2 cofactors: FMN, and Iron-sulfur.

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The CAS registry number for this enzyme class is 82869-33-8.

[edit] Gene Ontology (GO) codes

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