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EC 1.14.13.90 Details
EC 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
EC Tree
1.14.13.45 created 1992, deleted 2003