Chlorophyll(ide) b reductase

Chlorophyll(ide) b reductase (EC 1.1.1.294), chlorophyll b reductase, Chl b reductase) is an enzyme with systematic name 71-hydroxychlorophyllide-a:NAD(P)+ oxidoreductase.[1][2][3][4][5] This enzyme catalyses the following chemical reaction

71-hydroxychlorophyllide a + NAD(P)+ chlorophyllide b + NAD(P)H + H+
Chlorophyll(ide) b reductase
Identifiers
EC number1.1.1.294
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum

This enzyme carries out the first step in the conversion of chlorophyll b to chlorophyll a. It is 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.

References
  1. Scheumann V, Ito H, Tanaka A, Schoch S, Rüdiger W (November 1996). "Substrate specificity of chlorophyll(ide) b reductase in etioplasts of barley (Hordeum vulgare L.)". European Journal of Biochemistry. 242 (1): 163–70. doi:10.1111/j.1432-1033.1996.0163r.x. PMID 8954166.
  2. Scheumann V, Schoch S, Rüdiger W (December 1998). "Chlorophyll a formation in the chlorophyll b reductase reaction requires reduced ferredoxin". The Journal of Biological Chemistry. 273 (52): 35102–8. doi:10.1074/jbc.273.52.35102. PMID 9857045.
  3. Hörtensteiner S (2006). "Chlorophyll degradation during senescence". Annual Review of Plant Biology. 57: 55–77. doi:10.1146/annurev.arplant.57.032905.105212. PMID 16669755.
  4. Ito H, Ohtsuka T, Tanaka A (January 1996). "Conversion of chlorophyll b to chlorophyll a via 7-hydroxymethyl chlorophyll". The Journal of Biological Chemistry. 271 (3): 1475–9. doi:10.1074/jbc.271.3.1475. PMID 8576141.
  5. Rüdiger W (2002). "Biosynthesis of chlorophyll b and the chlorophyll cycle". Photosynthesis Research. 74 (2): 187–93. doi:10.1023/A:1020959610952. PMID 16228557.
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