The Enzyme Database

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EC 1.1.1.294     
Accepted name: chlorophyll(ide) b reductase
Reaction: 71-hydroxychlorophyllide a + NAD(P)+ = chlorophyllide b + NAD(P)H + H+
For diagram of the chlorophyll cycle, click here
Other name(s): chlorophyll b reductase; Chl b reductase
Systematic name: 71-hydroxychlorophyllide-a:NAD(P)+ oxidoreductase
Comments: 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 [3] and it also forms part of the chlorophyll cycle, which interconverts chlorophyll a and b in response to changing light conditions [4,5].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Scheumann, V., Ito, H., Tanaka, A., Schoch, S. and Rüdiger, W. Substrate specificity of chlorophyll(ide) b reductase in etioplasts of barley (Hordeum vulgare L.). Eur. J. Biochem. 242 (1996) 163–170. [PMID: 8954166]
2.  Scheumann, V., Schoch, S. and Rüdiger, W. Chlorophyll a formation in the chlorophyll b reductase reaction requires reduced ferredoxin. J. Biol. Chem. 273 (1998) 35102–35108. [PMID: 9857045]
3.  Hörtensteiner, S. Chlorophyll degradation during senescence. Annu. Rev. Plant Biol. 57 (2006) 55–77. [PMID: 16669755]
4.  Ito, H., Ohtsuka, T. and Tanaka, A. Conversion of chlorophyll b to chlorophyll a via 7-hydroxymethyl chlorophyll. J. Biol. Chem. 271 (1996) 1475–1479. [PMID: 8576141]
5.  Rüdiger, W. Biosynthesis of chlorophyll b and the chlorophyll cycle. Photosynth. Res. 74 (2002) 187–193. [PMID: 16228557]
[EC 1.1.1.294 created 2007]
 
 


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