Phytoene desaturase (3,4 didehydrolycopene forming)

Phytoene desaturase (3,4-didehydrolycopene-forming) (EC 1.3.99.30, 5-step phytoene desaturase, five-step phytoene desaturase, phytoene desaturase (ambiguous), Al-1) is an enzyme with systematic name 15-cis-phytoene:acceptor oxidoreductase (3,4-didehydrolycopene-forming). This enzyme catalyses the following chemical reaction

15-cis-phytoene + 5 acceptor ⇌ all-trans-3,4-didehydrolycopene + 5 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(1c) all-trans-zeta-carotene + acceptor ⇌ all-trans-neurosporene + reduced acceptor(1d) all-trans-neurosporene + acceptor ⇌ all-trans-lycopene + reduced acceptor(1e) all-trans-lycopene + acceptor ⇌ all-trans-3,4-didehydrolycopene + reduced acceptor

This enzyme is involved in carotenoid biosynthesis.