ID   1.14.99.64
DE   zeaxanthin 4-ketolase.
CA   (1) all-trans-zeaxanthin + 2 AH2 + 2 O2 = all-trans-adonixanthin + 2 A +
CA   3 H2O.
CA   (2) all-trans-adonixanthin + 2 AH2 + 2 O2 = all-trans-(3S,3'S)-
CA   astaxanthin + 2 A + 3 H2O.
CC   -!- The enzyme has a similar activity to that of EC 1.14.99.63,
CC       but unlike that enzyme is able to also act on zeaxanthin.
DR   Q4VKB4, BKT_CHLRE  ;
//