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Information on EC 1.23.5.1 - violaxanthin de-epoxidase

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EC Tree
IUBMB Comments
Along with EC 1.14.15.21, zeaxanthin epoxidase, this enzyme forms part of the xanthophyll (or violaxanthin) cycle for controlling the concentration of zeaxanthin in chloroplasts. It is activated by a low pH of the thylakoid lumen (produced by high light intensity). Zeaxanthin induces the dissipation of excitation energy in the chlorophyll of the light-harvesting protein complex of photosystem II. In higher plants the enzyme reacts with all-trans-diepoxides, such as violaxanthin, and all-trans-monoepoxides, but in the alga Mantoniella squamata, only the diepoxides are good substrates.
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Word Map
The enzyme appears in viruses and cellular organisms
Synonyms
violaxanthin de-epoxidase, csvde, vx de-epoxidase, zmvde1, ahvde, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
antheraxanthin + L-ascorbate = zeaxanthin + L-dehydroascorbate + H2O
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violaxanthin + 2 L-ascorbate = zeaxanthin + 2 L-dehydroascorbate + 2 H2O
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overall reaction
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violaxanthin + L-ascorbate = antheraxanthin + L-dehydroascorbate + H2O
show the reaction diagram
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