Reaction catalyzed by beta-carotene 4-ketolase (1.14.99.63)
+
2
reduced acceptor
+
2
=
+
2
acceptor
+
3
H2O
echinenone
+
2 reduced acceptor
+
2 O2
=
canthaxanthin
+
2 acceptor
+
3 H2O
