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crtYB

Gene
crtYB
Protein
Bifunctional lycopene cyclase/phytoene synthase
Organism
Phaffia rhodozyma
Length
673 amino acids
Function
Bifunctional enzyme that catalyzes the reactions from geranylgeranyl diphosphate to phytoene (phytoene synthase) and lycopene to beta-carotene via the intermediate gamma-carotene (lycopene cyclase). The cyclase preferentially catalyzes the symmetric cyclization of both ends of the substrate to produce dicyclic carotenoids. Beta-carotene is further processed to the acidic carotenoid astaxanthin.
Similarity
In the C-terminal section; belongs to the phytoene/squalene synthase family.
Mass
74.736 kDa
Sequence
MTALAYYQIHLIYTLPILGLLGLLTSPILTKFDIYKISILVFIAFSATTPWDSWIIRNGAWTYPSAESGQGVFGTFLDVPYEEYAFFVIQTVITGLVYVLATRHLLPSLALPKTRSSALSLALKALIPLPIIYLFTAHPSPSPDPLVTDHYFYMRALSLLITPPTMLLAALSGEYAFDWKSGRAKSTIAAIMIPTVYLIWVDYVAVGQDSWSINDEKIVGWRLGGVLPIEEAMFFLLTNLMIVLGLSACDHTQALYLLHGRTIYGNKKMPSSFPLITPPVLSLFFSSRPYSSQPKRDLELAVKLLEEKSRSFFVASAGFPSEVRERLVGLYAFCRVTDDLIDSPEVSSNPHATIDMVSDFLTLLFGPPLHPSQPDKILSSPLLPPSHPSRPTGMYPLPPPPSLSPAELVQFLTERVPVQYHFAFRLLAKLQGLIPRYPLDELLRGYTTDLIFPLSTEAVQARKTPIETTADLLDYGLCVAGSVAELLVYVSWASAPSQVPATIEEREAVLVASREMGTALQLVNIARDIKGDATEGRFYLPLSFFGLRDESKLAIPTDWTEPRPQDFDKLLSLSPSSTLPSSNASESFRFEWKTYSLPLVAYAEDLAKHSYKGIDRLPTEVQAGMRAACASYLLIGREIKVVWKGDVGERRTVAGWRRVRKVLSVVMSGWEGQ