• Source: Violaxanthin de-epoxidase

Violaxanthin de-epoxidase (EC 1.10.99.3, VDE) is an enzyme with systematic name violaxanthin:ascorbate oxidoreductase. This enzyme catalyses the following chemical reaction

violaxanthin + 2 L-ascorbate



⇌


{\displaystyle \rightleftharpoons }

zeaxanthin + 2 L-dehydroascorbate + 2 H2O (overall reaction)
(1a) violaxanthin + L-ascorbate



⇌


{\displaystyle \rightleftharpoons }

antheraxanthin + L-dehydroascorbate + H2O
(1b) antheraxanthin + L-ascorbate



⇌


{\displaystyle \rightleftharpoons }

zeaxanthin + L-dehydroascorbate + H2O
Violaxanthin de-epoxidase is a part of the xanthophyll (or violaxanthin) cycle for controlling the concentration of zeaxanthin in chloroplasts.




References






External links


Violaxanthin+de-epoxidase at the U.S. National Library of Medicine Medical Subject Headings (MeSH)

Kata Kunci Pencarian:

• Xantofil
• Violaxanthin de-epoxidase
• Xanthophyll
• VDE
• Non-photochemical quenching
• Zeaxanthin epoxidase
• Antheraxanthin
• List of EC numbers (EC 1)