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.
1.  Prairie, R.L. and Talalay, P. Enzymatic formation of testololactone. Biochemistry 2 (1963) 203–208. [PMID: 13985909]
[EC created 1972, modified 1999]

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