ENZYME entry: EC 1.13.11.51
Accepted Name |
9-cis-epoxycarotenoid dioxygenase.
|
Alternative Name(s) |
NCED. |
Nine-cis-epoxycarotenoid dioxygenase. |
VP14. |
Reaction catalysed |
- A 9-cis-epoxycarotenoid + O(2) <=> 2-cis,4-trans-xanthoxin + a 12'-apo-carotenal
- 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
- 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
|
Cofactor(s) |
Fe cation.
|
Comment(s) |
- Acts on 9-cis-violaxanthin and 9'-cis-neoxanthin but not on the all-
trans isomers.
- In vitro, it will cleave 9-cis-zeaxanthin.
- Catalyzes 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, EC 1.2.3.14 and EC 1.14.13.93.
|
Cross-references |
BRENDA | 1.13.11.51 |
EC2PDB | 1.13.11.51 |
ExplorEnz | 1.13.11.51 |
PRIAM enzyme-specific profiles | 1.13.11.51 |
KEGG Ligand Database for Enzyme Nomenclature | 1.13.11.51 |
IUBMB Enzyme Nomenclature | 1.13.11.51 |
IntEnz | 1.13.11.51 |
MEDLINE | Find literature relating to 1.13.11.51 |
MetaCyc | 1.13.11.51 |
UniProtKB/Swiss-Prot |
O24592, NCED1_MAIZE; | Q6YVJ0, NCED1_ORYSJ; | Q9M6E8, NCED1_PHAVU; |
O24023, NCED1_SOLLC; | O49505, NCED2_ARATH; | Q5MBR6, NCED2_ORYSJ; |
K4CJJ1, NCED2_SOLLC; | Q9LRR7, NCED3_ARATH; | Q5MBR5, NCED3_ORYSJ; |
Q69NX5, NCED4_ORYSJ; | Q9C6Z1, NCED5_ARATH; | Q5MBR3, NCED5_ORYSJ; |
Q9LRM7, NCED6_ARATH; | Q9M9F5, NCED9_ARATH; | C3VEQ3, NCED_ONCHC; |
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