ID 1.3.99.31 DE phytoene desaturase (lycopene-forming). AN 4-step phytoene desaturase. CA 15-cis-phytoene + 4 A = 4 AH2 + all-trans-lycopene. CC -!- The enzyme is involved in carotenoid biosynthesis and catalyzes up to CC four desaturation steps (cf. EC 1.3.99.28, EC 1.3.99.29 and CC EC 1.3.99.30). DR P21685, CRTI_PANAN ; P54978, CRTI_PARSN ; P22871, CRTI_PSEVU ; //