| Synonyms |
accelerated cell death 1, ACD1, AtPaO, chloroplast pheophorbide a oxygenase PaO1, chloroplast pheophorbide a oxygenase PaO2, CitPaO, lethal leaf spot protein LLS1, lethal leaf-spot 1 homolog, Lls1, PAO, pheide a monooxygenase, pheide a oxygenase, pheophorbide a oxygenase |
| 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 [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]. |
