All-trans-zeta-carotene desaturase

All-trans-zeta-carotene desaturase (, Crtlb, phytoene desaturase (ambiguous), 2-step phytoene desaturase (ambiguous), two-step phytoene desaturase (ambiguous), CrtI (ambiguous)) is an enzyme with systematic name all-trans-zeta-carotene:acceptor oxidoreductase. This enzyme catalyses the following chemical reaction


 * all-trans-zeta-carotene + 2 acceptor $$\rightleftharpoons$$ all-trans-lycopene + 2 reduced acceptor (overall reaction)
 * (1a) all-trans-zeta-carotene + acceptor $$\rightleftharpoons$$ all-trans-neurosporene + reduced acceptor
 * (1b) all-trans-neurosporene + acceptor $$\rightleftharpoons$$ all-trans-lycopene + reduced acceptor

This enzyme is involved in carotenoid biosynthesis.