carotenoid dioxygenase activity 9-cis-epoxycarotenoid dioxygenase activity https://github.com/geneontology/go-ontology/issues/30193 GO:0045549 molecular_function VP14 Catalysis of the reactions: a 9-cis-epoxycarotenoid + O2 = 2-cis,4-trans-xanthoxin + a 12'-apo-carotenal; 9-cis-violaxanthin + O2 = 2-cis,4-trans-xanthoxin + (3S,5R,6S)-5,6-epoxy-3-hydroxy-5,6-dihydro-12'-apo-beta-caroten-12'-al; and 9'-cis-neoxanthin + O2 = 2-cis,4-trans-xanthoxin + (3S,5R,6R)-5,6-dihydroxy-6,7-didehydro-5,6-dihydro-12'-apo-beta-caroten-12'-al. EC:1.13.11.51 nine-cis-epoxycarotenoid dioxygenase activity PvNCED1 AtNCED3 9-cis-epoxycarotenoid 11,12-dioxygenase activity NCED neoxanthin cleavage enzyme