Phytoene desaturase (3,4-didehydrolycopene-forming)

Phytoene desaturase (3,4-didehydrolycopene-forming) (, 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 $$\rightleftharpoons$$ all-trans-3,4-didehydrolycopene + 5 reduced acceptor (overall reaction)
 * (1a) 15-cis-phytoene + acceptor $$\rightleftharpoons$$ all-trans-phytofluene + reduced acceptor
 * (1b) all-trans-phytofluene + acceptor $$\rightleftharpoons$$ all-trans-zeta-carotene + reduced acceptor
 * (1c) all-trans-zeta-carotene + acceptor $$\rightleftharpoons$$ all-trans-neurosporene + reduced acceptor
 * (1d) all-trans-neurosporene + acceptor $$\rightleftharpoons$$ all-trans-lycopene + reduced acceptor
 * (1e) all-trans-lycopene + acceptor $$\rightleftharpoons$$ all-trans-3,4-didehydrolycopene + reduced acceptor

This enzyme is involved in carotenoid biosynthesis.