Protein
9-cis-epoxycarotenoid dioxygenase, chloroplastic
Organism
Oncidium hybrid cultivar
Function
Has a 11,12(11',12') 9-cis epoxycarotenoid cleavage activity. Catalyzes the first step of abscisic-acid biosynthesis from carotenoids. Not active on the all-trans isomers of violaxanthin and neoxanthin. Contributes probably to abscisic acid synthesis for the induction of seed dormancy (By similarity).
Similarity
Belongs to the carotenoid oxygenase family.
Sequence
MASSMSLFISSSSNQTVNSDTLRLKQSSKPTNLIHPNPIKLVRSRQVIAGSIQCSTTPNSFGLDTTSPSPFYPLPPTCPKEIHPEQSAKPSRPSWNLFQRAAAAVLEAVEDNLIQNLLESGHPLPKTADPAVQIAGNFAPVGEQKPHHDLPVDGRIPPLINGVYLRNGANPLFEPVAGHHFFDGDGMVHAVHLRNGRASYACRFTETERLKQERAVGRAIFPKAIGELHGHSGIARLLLFYARGLLGLIDHSRGTGVANAGLIYFNNRLLAMSEDDLPYHVRIKPNGDLETAGRYDFDGQLTTTMIAHPKLDPETREFFALSYDVIKKPYLKYFRFSPCGEKSPDVEIPLPQPTMMHDFAITKNFVIIPDQQVVFKLQEMICGGSPVVYDKEKIARFGVLPKYAIDASEMQWIDVPDCFCFHLWNSWEEPETEEVVVIGSCMTPPDSIFNESEENLQSVLTEIRLNLRTGKSTRRPILRPGNSQINLEAGMVNRNRLGRRTRFAYLAIAEPWPKVSGFAKVDLASGEIQRFEYGDGGYGGEPYFVPREGCDREDGGYVLAFVHDEREGSSELLIMNAADMRLEAAVRLPSRVPYGFYGTFVSATELHSQA