9-cis-epoxycarotenoid dioxygenase EC#: 1.13.11.51; ChemWhat Code: 1374974

Product Name 9-cis-epoxycarotenoid dioxygenase
Example Structure Example Structure of 9-cis-epoxycarotenoid dioxygenase EC#: 1.13.11.51
Synonyms 9,10[9′,10′]carotenoid cleavage dioxygenase, 9-cis epoxycarotenoid dioxygenase, 9-cis-epoxcarotenoid dioxygenase, 9-cis-epoxicarotenoid dioxygenase, 9-cis-epoxycarotenoid dioxygenase, 9-cis-epoxycarotenoid dioxygenase 3, 9-cis-epoxycarotenoid dioxygenase 6, 9-cis-epoxycarotenoid dioxygenase1, 9-cis-epoxycarotenoid dioxygenase4, 9-cis-epoxycarotenoid dioxygenases, AtCCD1, AtNCED3, B-diox-II, carotenoid cleavage dioxygenase, carotenoid cleavage dioxygenase 1, CCD, CCD1, CCD7, CCD8, CitNCED2, CitNCED3, CMNCED1, CsNCED1, CsNCED2, DHN2, DKNCED1, LeNCED1, LeNCED2, LsNCED1, LsNCED2, LsNCED3, LsNCED4, NCED, NCED 3, NCED1, NCED2, NCED2A, NCED2B, NCED2D, NCED3, NCED4, NCED5, NCED6, NCED9, nine-cis-epoxy dioxygenase, nine-cis-epoxycarotenoid dioxygenase, nine-cis-epoxycarotenoid dioxygenase 3, NosCCD, Nostoc carotenoid cleavage dioxygenase, NSC1, NSC2, NSC3, PpNCED1, PpNCED2, putative carotenoid cleavage dioxygenase, PvNCED1, SgNCED1, STO1, VP14, VP14 epoxy-carotenoid dioxygenase, VP14 protein, VuNCED1 protein, VvNCED1
EC Number 1.13.11.51
CAS Registry Number
Comments Requires iron(II). Acts on 9-cis-violaxanthin and 9′-cis-neoxanthin but not on the all-trans isomers [2,3]. In vitro, it will cleave 9-cis-zeaxanthin. Catalyses the first step of abscisic-acid biosynthesis from carotenoids in chloroplasts, in response to water stress. The other enzymes involved in the abscisic-acid biosynthesis pathway are EC 1.1.1.288 (xanthoxin dehydrogenase), EC 1.2.3.14 (abscisic aldehyde oxidase) and EC 1.14.13.93 [(+)-abscisic acid 8′-hydroxylase].
Cofactor Fe cation
History
Reactions (1) A 9-cis-epoxycarotenoid + O(2) = 2-cis,4-trans-xanthoxin + a 12′-apo- carotenal. (2) 9-cis-violaxanthin + O(2) = 2-cis,4-trans-xanthoxin + (3S,5R,6S)-5,6- epoxy-3-hydroxy-5,6-dihydro-12′-apo-beta-caroten-12′-al. (3) 9′-cis-neoxanthin + O(2) = 2-cis,4-trans-xanthoxin + (3S,5R,6R)-5,6- dihydroxy-6,7-didehydro-5,6-dihydro-12′-apo-beta-caroten-12′-al.

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