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ENZYME

ENZYME entry: EC 1.13.11.51

PURL: https://purl.expasy.org/enzyme/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 + O2 = a 12'-apo-carotenal + 2-cis,4-trans-xanthoxin
  • 9-cis-violaxanthin + O2 = (3S,5R,6S)-5,6-epoxy-3-hydroxy-5,6-dihydro-12'-apo-beta-caroten-12'-al + 2-cis,4-trans-xanthoxin
  • 9'-cis-neoxanthin + O2 = (3S,5R,6R)-3,5-dihydroxy-6,7-didehydro-5,6-dihydro-12'-apo-beta-caroten-12'-al + 2-cis,4-trans-xanthoxin
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
BRENDA1.13.11.51
EC2PDB1.13.11.51
ExplorEnz1.13.11.51
KEGG Ligand Database for Enzyme Nomenclature1.13.11.51
IUBMB Enzyme Nomenclature1.13.11.51
MEDLINEFind literature relating to 1.13.11.51
MetaCyc1.13.11.51
Rhea expert-curated reactions1.13.11.51
UniProtKB/Swiss-Prot
O24592, NCED1_MAIZEQ6YVJ0, NCED1_ORYSJQ9M6E8, NCED1_PHAVU
O24023, NCED1_SOLLCO49505, NCED2_ARATHQ5MBR6, NCED2_ORYSJ
K4CJJ1, NCED2_SOLLCQ9LRR7, NCED3_ARATHQ5MBR5, NCED3_ORYSJ
Q69NX5, NCED4_ORYSJQ9C6Z1, NCED5_ARATHQ5MBR3, NCED5_ORYSJ
Q9LRM7, NCED6_ARATHQ9M9F5, NCED9_ARATHC3VEQ3, NCED_ONCHC

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