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Information on EC 1.14.15.21 - zeaxanthin epoxidase

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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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The enzyme appears in viruses and cellular organisms
Reaction Schemes
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+
4
reduced ferredoxin [iron-sulfur] cluster
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4
+
2
=
+
4
oxidized ferredoxin [iron-sulfur] cluster
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2
Synonyms
ABA2 protein, At5g67030, CHL, chloroplastic lipocalin, LHCII, lipocalin-like protein, More, temperature stress-induced lipocalin, temperature-induced lipocalin, TIL, 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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