ID   1.14.15.17
DE   pheophorbide a oxygenase.
AN   PaO.
AN   PAO.
AN   pheide a monooxygenase.
AN   pheide a oxygenase.
CA   2 H(+) + O2 + pheophorbide a + 2 reduced [2Fe-2S]-[ferredoxin] =
CA   2 oxidized [2Fe-2S]-[ferredoxin] + red chlorophyll catabolite.
CC   -!- This enzyme catalyzes a key reaction in chlorophyll degradation,
CC       which occurs during leaf senescence and fruit ripening in higher
CC       plants.
CC   -!- The enzyme from Arabidopsis contains a Rieske-type iron-sulfur
CC       cluster and requires reduced ferredoxin, which is generated either by
CC       NADPH through the pentose-phosphate pathway or by the action of
CC       photosystem I.
CC   -!- While still attached to this enzyme, the product is rapidly converted
CC       into primary fluorescent chlorophyll catabolite by the action of
CC       EC 1.3.7.12.
CC   -!- Pheophorbide b acts as an inhibitor.
CC   -!- In (18)O2 labeling experiments, only the aldehyde oxygen is labeled,
CC       suggesting that the other oxygen atom may originate from H2O.
CC   -!- Formerly EC 1.14.12.20.
DR   Q9FYC2, PAO_ARATH  ;  Q0DV66, PAO_ORYSJ  ;
//