ID   1.14.12.20
DE   Pheophorbide a oxygenase.
AN   PaO.
AN   PAO.
AN   Pheide a monooxygenase.
AN   Pheide a oxygenase.
CA   Pheophorbide a + NADPH + O(2) = red chlorophyll catabolite + NADP(+).
CC   -!- Catalyzes a key reaction in chlorophyll degradation, which occurs
CC       during leaf senescence and fruit ripening in higher plants.
CC   -!- Requires reduced ferredoxin, which is generated either by NADPH
CC       through the pentose-phosphate pathway or by the action of photosystem
CC       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 1.3.1.80.
CC   -!- Pheophorbide b acts as an inhibitor.
CC   -!- In (18)O(2) labelling experiments, only the aldehyde oxygen is
CC       labelled, suggesting that the other oxygen atom may originate from
CC       H(2)O.
DR   Q9FYC2, PAO_ARATH  ;
//