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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
Pheophorbide a oxygenase.
Alternative Name(s)
Pheide a monooxygenase.
Pheide a oxygenase.
Reaction catalysed
Pheophorbide a + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H(+) + O(2) <=> red chlorophyll catabolite + 2 oxidized ferredoxin [iron-sulfur] cluster
  • This enzyme catalyzes a key reaction in chlorophyll degradation, which occurs during leaf senescence and fruit ripening in higher plants.
  • The enzyme from Arabidopsis contains a Rieske-type iron-sulfur cluster and requires reduced ferredoxin, which is generated either by NADPH through the pentose-phosphate pathway or by the action of photosystem I.
  • While still attached to this enzyme, the product is rapidly converted into primary fluorescent chlorophyll catabolite by the action of EC
  • Pheophorbide b acts as an inhibitor.
  • In (18)O(2) labelling experiments, only the aldehyde oxygen is labelled, suggesting that the other oxygen atom may originate from H(2)O.
  • Formerly EC
PRIAM enzyme-specific profiles1.14.15.17
KEGG Ligand Database for Enzyme Nomenclature1.14.15.17
IUBMB Enzyme Nomenclature1.14.15.17
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