violaxanthin de-epoxidase EC#: 1.23.5.1

Product Name violaxanthin de-epoxidase
Example Structure Example Structure of violaxanthin de-epoxidase EC#: 1.23.5.1
Synonyms AhVDE, CsVDE, lipocalin-like protein, NPQ1, VDE, Vio de-epoxidase, violaxanthin de-epoxidase, Vx de-epoxidase, ZmVDE1
EC Number 1.23.5.1
CAS Registry Number
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.
Cofactor
History
Reactions Violaxanthin + 2 L-ascorbate = antheraxanthin + 2 L-dehydroascorbate + H(2)O.

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