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Information on EC 1.14.15.21 - zeaxanthin epoxidase

for references in articles please use BRENDA:EC1.14.15.21
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EC Tree
IUBMB Comments
A flavoprotein (FAD) that is active under conditions of low light. Along with EC 1.23.5.1, 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.
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Word Map
The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
Reaction Schemes
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+
4
reduced ferredoxin [iron-sulfur] cluster
+
4
+
2
=
+
4
oxidized ferredoxin [iron-sulfur] cluster
+
2
Synonyms
lhcii, zeaxanthin epoxidase, temperature-induced lipocalin, lipocalin-like protein, chloroplastic lipocalin, aba2 protein, zea-epoxidase, zeaxanthin-epoxidase, violaxanthin cycle enzyme, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
antheraxanthin + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H+ + O2 = violaxanthin + 2 oxidized ferredoxin [iron-sulfur] cluster + H2O
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zeaxanthin + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H+ + O2 = antheraxanthin + 2 oxidized ferredoxin [iron-sulfur] cluster + H2O
show the reaction diagram
zeaxanthin + 4 reduced ferredoxin [iron-sulfur] cluster + 4 H+ + 2 O2 = violaxanthin + 4 oxidized ferredoxin [iron-sulfur] cluster + 2 H2O
show the reaction diagram
overall reaction
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