ID   1.3.7.5
DE   phycocyanobilin:ferredoxin oxidoreductase.
CA   (2R,3Z)-phycocyanobilin + 4 oxidized [2Fe-2S]-[ferredoxin] = biliverdin
CA   IXalpha + 4 H(+) + 4 reduced [2Fe-2S]-[ferredoxin].
CC   -!- Catalyzes the four-electron reduction of biliverdin IXalpha
CC       (2-electron reduction at both the A and D rings).
CC   -!- Reaction proceeds via an isolatable 2-electron intermediate,
CC       18(1),18(2)-dihydrobiliverdin.
CC   -!- Flavodoxins can be used instead of ferredoxin.
CC   -!- The direct conversion of biliverdin IXalpha (BV) to (3Z)-
CC       phycocyanobilin (PCB) in the cyanobacteria Synechocystis sp.
CC       PCC 6803, Anabaena sp. PCC7120 and Nostoc punctiforme is in contrast
CC       to the proposed pathways of PCB biosynthesis in the red alga
CC       Cyanidium caldarium, which involves (3Z)-phycoerythrobilin (PEB) as
CC       an intermediate and in the green alga Mesotaenium caldariorum,
CC       in which PCB is an isolable intermediate.
DR   B1X018, PCYA_CROS5 ;  B7KJQ2, PCYA_GLOC7 ;  Q7NHE8, PCYA_GLOVI ;
DR   B0JPG5, PCYA_MICAN ;  Q93TM9, PCYA_NOSP7 ;  Q93TN0, PCYA_NOSS1 ;
DR   Q7U7A1, PCYA_PARMW ;  A3PCF5, PCYA_PROM0 ;  A8G4C5, PCYA_PROM2 ;
DR   A2CA92, PCYA_PROM3 ;  A2BW83, PCYA_PROM5 ;  Q31BD0, PCYA_PROM9 ;
DR   Q7VCC2, PCYA_PROMA ;  Q7V7Y8, PCYA_PROMM ;  Q93TL5, PCYA_PROMP ;
DR   A2BQN3, PCYA_PROMS ;  B7JWS2, PCYA_RIPO1 ;  Q8KPS9, PCYA_SYNE7 ;
DR   Q5N5A3, PCYA_SYNP6 ;  Q3AXI3, PCYA_SYNS9 ;  Q3AKB1, PCYA_SYNSC ;
DR   Q55891, PCYA_SYNY3 ;  P59288, PCYA_THEVB ;  Q10X61, PCYA_TRIEI ;
DR   Q3M745, PCYA_TRIV2 ;
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