Protein
Bifunctional lycopene cyclase/phytoene synthase
Organism
Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987)
Function
Bifunctional enzyme that catalyzes the reactions from geranylgeranyl diphosphate to phytoene (phytoene synthase) and from lycopene to beta-carotene via the intermediate gamma-carotene and from 3,4-didehydrolycopene to torulene (lycopene cyclase). Torulene is further processed to the acidic carotenoid neurosporaxanthin. The cyclase preferentially catalyzes single cyclizations at only one end of the substrate to produce monocyclic carotenoids.
Similarity
In the C-terminal section; belongs to the phytoene/squalene synthase family.
Sequence
MYDYAFVHLKFTVPAAVLLTAIAYPILNRIHLIQTGFLVVVAFTAALPWDAYLIKHKVWSYPPEAIVGPRLLGIPFEELFFFVIQTYITALVYILFNKPVLHALHLNNQQNPPAWMRVVKVTGQVVLVALSVWGWNAAQVHQETSYLGLILVWACPFLLAIWTLAGRFILSLPWYATVLPMFLPTFYLWAVDEFALHRGTWSIGSGTKLDFCLFGKLDIEEATFFLVTNMLIVGGMAAFDQYLAVIYAFPTLFPKVNRYPTTHMLLQSRLINTSRYDLERIEGLREAVERLRLKSRSFYLANSLFSGRLRIDLILLYSFCRLADDLVDDAKSRREVLSWTAKLNHFLDLHYKDADATEDPKKKAERIDAYIKTAFPPCAYQALHLLPTHILPPKPLYDLIKGFEMDSQFTFHGTSDSTDLQYPIADDKDLENYAIYVAGTVGELCIALIIYHCLPDMSDTQKRELETAACRMGIALQYVNIARDIVVDARIGRVYLPTTWLKKEGLTHKMVLENPEGPEVIERMRRRLLENAFELYGGARPEMQRIPSEARGPMIGAVENYMAIGRVLRERKEGTVFVRMEGRATVPKRRRLSTLLRALYEQ