Protein
Violaxanthin de-epoxidase, chloroplastic
Organism
Nicotiana tabacum
Function
Part of the xanthophyll (or violaxanthin) cycle for controlling the concentration of zeaxanthin in chloroplasts. Catalyzes the two-step mono de-epoxidation reaction. Stereospecific for all-trans xanthophylls. Zeaxanthin induces the dissipation of excitation energy in the chlorophyll of the light-harvesting protein complex of photosystem II.
Similarity
Belongs to the calycin superfamily. Lipocalin family.
Sequence
MALAPHSNFLANHETIKYYVGSKLPGHKRFSWGWEDYFGSIVVAKICSSRRIPRYFRKSPRICCGLDSRGLQLFSHGKHNLSPAHSINQNVPKGNSGCKFPKDVALMVWEKWGQFAKTAIVAIFILSVASKADAVDALKTCTCLLKECRLELAKCISNPACAANVACLQTCNNRPDETECQIKCGDLFENSVVDEFNECAVSRKKCVPRKSDVGDFPVPDPSVLVQKFDMKDFSGKWFITRGLNPTFDAFDCQLHEFHTEENKLVGNLSWRIRTPDGGFFTRSAVQKFVQDPKYPGILYNHDNEYLLYQDDWYILSSKVENSPEDYIFVYYKGRNDAWDGYGGSVLYTRSAVLPESIIPELQTAAQKVGRDFNTFIKTDNTCGPEPPLVERLEKKVEEGERTIIKEVEEIEEEVEKVRDKEVTLFSKLFEGFKELQRDEENFLRELSKEEMDVLDGLKMEATEVEKLFGRALPIRKLR