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Information on EC 1.14.15.17 - pheophorbide a oxygenase

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IUBMB Comments
This enzyme catalyses 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 1.3.7.12, red chlorophyll catabolite reductase [2,6]. Pheophorbide b acts as an inhibitor. In 18O2 labelling experiments, only the aldehyde oxygen is labelled, suggesting that the other oxygen atom may originate from H2O .
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The enzyme appears in viruses and cellular organisms
Reaction Schemes
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2
reduced ferredoxin [iron-sulfur] cluster
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oxidized ferredoxin [iron-sulfur] cluster
Synonyms
pheide a oxygenase, atpao, accelerated cell death 1, lethal leaf spot protein lls1, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
epoxypheophorbide a + H2O = red chlorophyll catabolite
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spontaneous
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pheophorbide a + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H+ + O2 = epoxypheophorbide a + 2 oxidized ferredoxin [iron-sulfur] cluster + H2O
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(1a)
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pheophorbide a + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H+ + O2 = red chlorophyll catabolite + 2 oxidized ferredoxin [iron-sulfur] cluster
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overall reaction
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