ID   1.3.99.40
DE   carotenoid chi-ring synthase.
CA   2 A + a carotenoid beta-end derivative = a carotenoid chi-end derivative
CA   + 2 AH2.
CC   -!- The enzyme, found in purple sulfur bacteria (Chromatiaceae) and some
CC       cyanobacteria, is involved in the biosynthesis of carotenoids that
CC       contain chi-type end groups, such as okenone, renierapurpurin,
CC       and synechoxanthin.
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