ENZYME entry: EC 1.1.1.294
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 |
Comment(s) |
- 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.
|
Cross-references |
PROSITE | PDOC00060 |
BRENDA | 1.1.1.294 |
EC2PDB | 1.1.1.294 |
ExplorEnz | 1.1.1.294 |
PRIAM enzyme-specific profiles | 1.1.1.294 |
KEGG Ligand Database for Enzyme Nomenclature | 1.1.1.294 |
IUBMB Enzyme Nomenclature | 1.1.1.294 |
IntEnz | 1.1.1.294 |
MEDLINE | Find literature relating to 1.1.1.294 |
MetaCyc | 1.1.1.294 |
UniProtKB/Swiss-Prot |
|
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