Reaction catalyzed by phycobiliprotein cysteine-84 phycobilin lyase (4.4.1.29)
apo-[C-phycoerythrin beta-subunit]
+
=
[C-phycoerythrin beta-subunit]-Cys84-phycoerythrobilin
apo-[C-phycoerythrin beta-subunit]
+
(3E)-phycoerythrobilin
=
[C-phycoerythrin beta-subunit]-Cys84-phycoerythrobilin