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EC 1.14.13.90 Details
show Brenda entryEC number
1.14.13.90
Accepted name
zeaxanthin epoxidase
Reaction
zeaxanthin + 2 NAD(P)H + 2 H+ + 2 O2 = violaxanthin + 2 NAD(P)+ + 2 H2O (overall reaction);;(1a) zeaxanthin + NAD(P)H + H+ + O2 = antheraxanthin + NAD(P)+ + H2O;;(1b) antheraxanthin + NAD(P)H + H+ + O2 = violaxanthin + NAD(P)+ + H2O
Other name(s)
Zea-epoxidase
Systematic name
zeaxanthin,NAD(P)H:oxygen oxidoreductase
CAS registry number
149718-34-3
Comment
A flavoprotein (FAD) that is active under conditions of low light. Along with EC 1.10.99.3, violaxanthin de-epoxidase, this enzyme forms part of the xanthophyll (or violaxanthin) cycle, which is involved in protecting the plant against damage by excess light. It will also epoxidize lutein in some higher-plant species.
History
created 2005, deleted 2016
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1 Oxidoreductases
1.1 Acting on the CH-OH group of donors
1.6.99.4 created 1965, deleted 1972 1.6.99.8 created 1972, deleted 2002 1.6.99.9 created 1972, deleted 2002 1.6.99.10 created 1978, deleted 1981 1.6.99.11 created 1989, deleted 2002 1.6.99.12 created 1989, deleted 2002 1.6.99.13 created 1992, deleted 2002 1.14.13.45 created 1992, deleted 2003
