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EC 1.1.3.17 Details
EC number
1.1.3.17
Accepted name
choline oxidase
Reaction
choline + 2 O2 + H2O = betaine + 2 H2O2 (overall reaction);;(1a) choline + O2 = betaine aldehyde + H2O2;;(1b) betaine aldehyde + O2 + H2O = betaine + H2O2
Systematic name
choline:oxygen 1-oxidoreductase
CAS registry number
9028-67-5
Comment
A flavoprotein (FAD). In many bacteria, plants and animals, the osmoprotectant betaine is synthesized using different enzymes to catalyse the conversion of (1) choline into betaine aldehyde and (2) betaine aldehyde into betaine. In plants, the first reaction is catalysed by EC 1.14.15.7, choline monooxygenase, whereas in animals and many bacteria, it is catalysed by either membrane-bound choline dehydrogenase (EC 1.1.99.1) or soluble choline oxidase (EC 1.1.3.17) [6]. The enzyme involved in the second step, EC 1.2.1.8, betaine-aldehyde dehydrogenase, appears to be the same in those plants, animals and bacteria that use two separate enzymes.
History
created 1978, modified 2005, modified 2007
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