IUBMB Enzyme Nomenclature


Accepted name: androst-4-ene-3,17-dione monooxygenase

Reaction: androstenedione + reduced acceptor + O2 = testololactone + acceptor + H2O

Glossary: androstenedione = androst-4-ene-3,17-dione
testololactone = 3-oxo-13,17-secoandrost-4-eno-17,13-lactone

Other name(s): androstene-3,17-dione hydroxylase; androst-4-ene-3,17-dione 17-oxidoreductase; androst-4-ene-3,17-dione hydroxylase; androstenedione monooxygenase; 4-androstene-3,17-dione monooxygenase

Systematic name: androst-4-ene-3,17-dione-hydrogen-donor:oxygen oxidoreductase (13-hydroxylating, lactonizing)

Comments: Has a wide specificity. A single enzyme from the ascomycete Neonectria radicicola (EC ketosteroid monooxygenase) catalyses both this reaction and that catalysed by EC progesterone monooxygenase.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 37256-74-9


1. Prairie, R.L. and Talalay, P. Enzymatic formation of testololactone. Biochemistry 2 (1963) 203-208.

[EC created 1972, modified 1999]

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