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A new class EC 7, Translocases, has been added to the EC list. It will be part of ENZYME from release 2018_10. Read more about EC 7 here.

ENZYME entry: EC

Accepted Name
Chlorophyll(ide) b reductase.
Alternative Name(s)
Chl b reductase.
Chlorophyll b reductase.
Reaction catalysed
7(1)-hydroxychlorophyllide a + NAD(P)(+) <=> chlorophyllide b + NAD(P)H
  • Carries out the first step in the conversion of chlorophyll b to chlorophyll a.
  • Involved in chlorophyll degradation, which occurs during leaf senescence and it also forms part of the chlorophyll cycle, which interconverts chlorophyll a and b in response to changing light conditions.
  • While both chlorophyll a and chlorophyll b are found in higher plants, only breakdown products derived from chlorophyll a are found in the end products, i.e. non-fluorescent chlorophyll catabolites (NCCs).
  • The transition from chlorophyll b, which contains a formyl group on C7, to chlorophyll a, which contains a methyl group on C7, proceeds through the intermediate 7(1)-hydroxychlorophyll.
  • Another enzyme, which requires ferredoxin but has not been characterized fully, is required to complete the conversion.
PRIAM enzyme-specific profiles1.1.1.294
KEGG Ligand Database for Enzyme Nomenclature1.1.1.294
IUBMB Enzyme Nomenclature1.1.1.294
MEDLINEFind literature relating to
Q5N800, NYC1_ORYSJ;  

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