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EC 1.13.11.65 Details
EC number
1.13.11.65
Accepted name
carotenoid isomerooxygenase
Reaction
zeaxanthin + O2 = (3R)-11-cis-3-hydroxyretinal + (3R)-all-trans-3-hydroxyretinal
Other name(s)
ninaB (gene name)
Systematic name
zeaxanthin:oxygen 15,15′-oxidoreductase (bond-cleaving, cis-isomerizing)
Comment
The enzyme, characterized from the moth Galleria mellonella and the fruit fly Drosophila melanogaster, is involved in the synthesis of retinal from dietary caroteoids in insects. The enzyme accepts different all-trans carotenoids, including β-carotene, α-carotene and lutein, and catalyses the symmetrical cleavage of the carotenoid and the simultaneous isomerization of only one of the products to a cis configuration. When the substrate is hydroxylated only in one side (as in cryptoxanthin), the enzyme preferentially isomerizes the hydroxylated part of the molecule.
History
created 2012 as EC 1.14.13.164, transferred 2012 to EC 1.13.11.65
EC Tree
1.1.1.68 created 1965, deleted 1978 [transferred to EC 1.1.99.15, deleted 1980]
1.1.1.70 created 1965, deleted 1978
1.1.1.74 created 1972, deleted 1976
1.1.1.89 created 1972, deleted 1976
1.1.1.109 created 1972, deleted 1976
1.1.1.139 created 1972, deleted 1978
1.1.1.155 created 1976, deleted 2004
1.1.1.171 created 1978, deleted 1984
1.1.1.180 created 1983, deleted 1984
1.1.1.182 created 1983, deleted 1990
1.1.1.204 created 1972 as EC 1.2.1.37, transferred 1984 to EC 1.1.1.204, modified 1989, deleted 2004
1.1.1.242 created 1992, deleted 2001
1.1.1.249 provisional version created 1999, deleted 1999 (reinstated 2001 as EC 2.5.1.46)
1.1.1.253 created 1999, deleted 2003
1.1.99.15 created 1978, deleted 1980
1.1.99.17 created 1982, deleted 2003