1.14.15.17: pheophorbide a oxygenase
This is an abbreviated version!
For detailed information about pheophorbide a oxygenase, go to the full flat file.
Word Map on EC 1.14.15.17
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1.14.15.17
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chlorophyll
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catabolite
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ripening
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chlorophyllase
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stay-green
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macrocycle
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tetrapyrrole
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pheophytinase
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colorless
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degreening
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dark-induced
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phototoxic
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rieske
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nonfluorescent
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thermospermine
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rieske-type
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pheophytin
- 1.14.15.17
- chlorophyll
- catabolite
-
ripening
- chlorophyllase
-
stay-green
-
macrocycle
- tetrapyrrole
-
pheophytinase
-
colorless
-
degreening
-
dark-induced
-
phototoxic
-
rieske
-
nonfluorescent
- thermospermine
-
rieske-type
- pheophytin
Reaction
Synonyms
accelerated cell death 1, ACD1, AtPaO, chloroplast pheophorbide a oxygenase PaO1, chloroplast pheophorbide a oxygenase PaO2, CitPaO, EC 1.14.12.20, lethal leaf spot protein LLS1, lethal leaf-spot 1 homolog, Lls1, PAO, pheide a monooxygenase, pheide a oxygenase, pheophorbide a oxygenase
ECTree
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Systematic Name
Systematic Name on EC 1.14.15.17 - pheophorbide a oxygenase
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pheophorbide-a,ferredoxin:oxygen oxidoreductase (biladiene-forming)
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 [2] and requires reduced ferredoxin, which is generated either by NADPH through the pentose-phosphate pathway or by the action of photosystem I [4]. 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 [1].