Accepted name: phytoene desaturase (lycopene-forming)
Reaction: 15-cis-phytoene + 4 acceptor = all-trans-lycopene + 4 reduced acceptor (overall reaction)
(1a) 15-cis-phytoene + acceptor = all-trans-phytofluene + reduced acceptor
(1b) all-trans-phytofluene + acceptor = all-trans-ζ-carotene + reduced acceptor
(1c) all-trans-ζ-carotene + acceptor = all-trans-neurosporene + reduced acceptor
(1d) all-trans-neurosporene + acceptor = all-trans-lycopene + reduced acceptor
Other name(s): 4-step phytoene desaturase; four-step phytoene desaturase; phytoene desaturase (ambiguous); CrtI (ambiguous)
Systematic name: 15-cis-phytoene:acceptor oxidoreductase (lycopene-forming)
Comments: Requires FAD. The enzyme is involved in carotenoid biosynthesis and catalyses up to four desaturation steps (cf. EC [phytoene desaturase (neurosporene-forming)], EC [phytoene desaturase (ζ-carotene-forming)] and EC [phytoene desaturase (3,4-didehydrolycopene-forming)]).
1.  Fraser, P.D., Misawa, N., Linden, H., Yamano, S., Kobayashi, K. and Sandmann, G. Expression in Escherichia coli, purification, and reactivation of the recombinant Erwinia uredovora phytoene desaturase. J. Biol. Chem. 267 (1992) 19891–19895. [PMID: 1400305]
[EC created 2011]