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EC 1.1.3.6 Details
EC number
1.1.3.6
Accepted name
cholesterol oxidase
Reaction
cholesterol + O2 = cholest-5-en-3-one + H2O2
Other name(s)
cholesterol- O2 oxidoreductase, 3β-hydroxy steroid oxidoreductase, 3β-hydroxysteroid:oxygen oxidoreductase
Systematic name
cholesterol:oxygen oxidoreductase
CAS registry number
9028-76-6
Comment
Contains FAD. Cholesterol oxidases are secreted bacterial bifunctional enzymes that catalyse the first two steps in the degradation of cholesterol. The enzyme catalyses the oxidation of the 3β-hydroxyl group to a keto group, and the isomerization of the double bond in the oxidized steroid ring system from the Δ5 position to Δ6 position (cf. EC 5.3.3.1, steroid Δ-isomerase).
History
created 1961, modified 1982, modified 2012
EC Tree
1.1.3.1 created 1961, deleted 1984
1.1.3.22 created 1961 as EC 1.2.3.2, transferred 1984 to EC 1.1.3.22, modified 1989, deleted 2004
1.1.3.25 created 1986, deleted 2005
1.1.3.26 created 1989, deleted 2002
1.1.3.31 created 1992, deleted 2003
1.1.3.32 created 1999, deleted 2002
1.1.3.33 created 1999, deleted 2002
1.1.3.34 created 1999, deleted 2002
1.1.3.35 created 1999, deleted 2002
1.1.3.36 created 1999, deleted 2002
1.1.99.15 created 1978, deleted 1980
1.1.99.17 created 1982, deleted 2003