ID 5.2.1.12 DE zeta-carotene isomerase. AN 15-cis-zeta-carotene isomerase. CA 9,9',15-tri-cis-zeta-carotene = 9,9'-di-cis-zeta-carotene. CC -!- The enzyme catalyzes the cis-trans isomerization of the 15-15' CC carbon-carbon double bond in 9,15,9'-tricis-zeta-carotene, which is CC required for biosynthesis of all plant carotenoids. CC -!- Requires heme b. DR Q9SAC0, ZCIS_ARATH ; B4FHU1, ZCIS_MAIZE ; //