EC 1.13.11.51 - 9-cis-epoxycarotenoid dioxygenase

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ENZYME: 1.13.11.51


ID   1.13.11.51
DE   9-cis-epoxycarotenoid dioxygenase.
AN   NCED.
AN   Nine-cis-epoxycarotenoid dioxygenase.
AN   VP14.
CA   (1) A 9-cis-epoxycarotenoid + O(2) = 2-cis,4-trans-xanthoxin + a 12'-apo-
CA   carotenal.
CA   (2) 9-cis-violaxanthin + O(2) = 2-cis,4-trans-xanthoxin + (3S,5R,6S)-5,6-
CA   epoxy-3-hydroxy-5,6-dihydro-12'-apo-beta-caroten-12'-al.
CA   (3) 9'-cis-neoxanthin + O(2) = 2-cis,4-trans-xanthoxin + (3S,5R,6R)-5,6-
CA   dihydroxy-6,7-didehydro-5,6-dihydro-12'-apo-beta-caroten-12'-al.
CF   Fe cation.
CC   -!- Acts on 9-cis-violaxanthin and 9'-cis-neoxanthin but not on the all-
CC       trans isomers.
CC   -!- In vitro, it will cleave 9-cis-zeaxanthin.
CC   -!- Catalyzes the first step of abscisic-acid biosynthesis from
CC       carotenoids in chloroplasts, in response to water stress.
CC   -!- The other enzymes involved in the abscisic-acid biosynthesis pathway
CC       are EC 1.1.1.288, EC 1.2.3.14 and EC 1.14.13.93.
DR   O24592    , NCED1_MAIZE;  Q6YVJ0    , NCED1_ORYSJ;  Q9M6E8    , NCED1_PHAVU;
DR   O24023    , NCED1_SOLLC;  O49505    , NCED2_ARATH;  Q5MBR6    , NCED2_ORYSJ;
DR   K4CJJ1    , NCED2_SOLLC;  Q9LRR7    , NCED3_ARATH;  Q5MBR5    , NCED3_ORYSJ;
DR   Q69NX5    , NCED4_ORYSJ;  Q9C6Z1    , NCED5_ARATH;  Q5MBR3    , NCED5_ORYSJ;
DR   Q9LRM7    , NCED6_ARATH;  Q9M9F5    , NCED9_ARATH;  C3VEQ3    , NCED_ONCHC ;
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