Phytoene desaturase (zeta-carotene-forming) Tags: Enzyme.Phytoene desaturase (zeta-carotene-forming) (EC 1.3.99.29 CrtIa 2-step phytoene desaturase (ambiguous) two-step phytoene desaturase (ambiguous)) is an enzyme with system name 15-cis-phytoene:acceptor oxidoreductase (zeta-carotene-forming). EC number 1.3.99.29 Learn more... Loading...