ID   1.1.1.294
DE   chlorophyll(ide) b reductase.
AN   Chl b reductase.
AN   chlorophyll b reductase.
CA   (1) 7(1)-hydroxychlorophyllide a + NAD(+) = chlorophyllide b + H(+) +
CA   NADH.
CA   (2) 7(1)-hydroxychlorophyllide a + NADP(+) = chlorophyllide b + H(+) +
CA   NADPH.
CC   -!- Carries out the first step in the conversion of chlorophyll b to
CC       chlorophyll a.
CC   -!- Involved in chlorophyll degradation, which occurs during leaf
CC       senescence and it also forms part of the chlorophyll cycle, which
CC       interconverts chlorophyll a and b in response to changing light
CC       conditions.
CC   -!- While both chlorophyll a and chlorophyll b are found in higher
CC       plants, only breakdown products derived from chlorophyll a are found
CC       in the end products, i.e. non-fluorescent chlorophyll catabolites
CC       (NCCs).
CC   -!- The transition from chlorophyll b, which contains a formyl group on
CC       C7, to chlorophyll a, which contains a methyl group on C7, proceeds
CC       through the intermediate 7(1)-hydroxychlorophyll.
CC   -!- Another enzyme, which requires ferredoxin but has not been
CC       characterized fully, is required to complete the conversion.
DR   Q8LEU3, NOL_ARATH  ;  Q84ST4, NOL_ORYSJ  ;  Q93ZA0, NYC1_ARATH ;
DR   Q5N800, NYC1_ORYSJ ;
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