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A new class EC 7, Translocases, has been added to the EC list. It will be part of ENZYME from release 2018_10. Read more about EC 7 here.

ENZYME entry: EC

Accepted Name
Phytochromobilin:ferredoxin oxidoreductase.
Alternative Name(s)
P-Phi-B synthase.
PFB synthase.
Phytochromobilin synthase.
Reaction catalysed
(3Z)-phytochromobilin + 2 oxidized [2Fe-2S] ferredoxin <=> biliverdin IX-alpha + 2 reduced [2Fe-2S] ferredoxin
  • Catalyzes the two-electron reduction of biliverdin IX-alpha.
  • Can use [2Fe-2S] ferredoxins from a number of sources as acceptor but not the [4Fe-4S] ferredoxin from Clostridium pasteurianum.
  • The isomerization of (3Z)-phytochromobilin to (3E)-phytochromobilin is thought to occur prior to covalent attachment to apophytochrome in the plant cell cytoplasm.
  • Flavodoxins can be used instead of ferredoxin.
PRIAM enzyme-specific profiles1.3.7.4
KEGG Ligand Database for Enzyme Nomenclature1.3.7.4
IUBMB Enzyme Nomenclature1.3.7.4
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