Reaction catalyzed by phycobiliprotein cysteine-84 phycobilin lyase (4.4.1.29)
apo-[phycocyanin beta-subunit]
+
=
[phycocyanin beta-subunit]-Cys82-phycocyanobilin
apo-[phycocyanin beta-subunit]
+
(2R,3E)-phycocyanobilin
=
[phycocyanin beta-subunit]-Cys82-phycocyanobilin