15 Cis phytoene desaturase

15-Cis-phytoene desaturase (EC 1.3.5.5, phytoene desaturase (ambiguous), PDS, plant-type phytoene desaturase) is an enzyme with systematic name 15-cis-phytoene:plastoquinone oxidoreductase. This enzyme catalyses the following chemical reaction

15-cis-phytoene + 2 plastoquinone ⇌ 9,15,9'-tricis-zeta-carotene + 2 plastoquinol (overall reaction)(1a) 15-cis-phytoene + plastoquinone ⇌ 15,9'-dicis-phytofluene + plastoquinol(1b) 15,9'-dicis-phytofluene + plastoquinone ⇌ 9,15,9'-tricis-zeta-carotene + plastoquinol

This enzyme is involved in carotenoid biosynthesis in plants and cyanobacteria.