| 英文名 |
violaxanthin de-epoxidase |
| Example Structure |
 |
| 别名 |
AhVDE, CsVDE, lipocalin-like protein, NPQ1, VDE, Vio de-epoxidase, violaxanthin de-epoxidase, Vx de-epoxidase, ZmVDE1 |
| EC Number |
1.23.5.1 |
| CAS编号 |
|
| 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. |
