Phytoene desaturase (zeta-carotene-forming) (, CrtIa, 2-step phytoene desaturase (ambiguous), two-step phytoene desaturase (ambiguous)) is an enzyme with systematic name 15-cis-phytoene:acceptor oxidoreductase (zeta-carotene-forming). This enzyme catalyses the following chemical reaction
15-cis-phytoene + 2 acceptor all-trans-zeta-carotene + 2 reduced acceptor (overall reaction) (1a) 15-cis-phytoene + acceptor all-trans-phytofluene + reduced acceptor (1b) all-trans-phytofluene + acceptor all-trans-zeta-carotene + reduced acceptor
The enzyme is involved in carotenoid biosynthesis.
See also Phytoene desaturase (lycopene-forming) Phytoene desaturase (neurosporene-forming) 15-Cis-phytoene desaturase Phytoene desaturase (3,4-didehydrolycopene-forming)
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