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{{DISPLAYTITLE:Chlorophyll(ide) ''b'' reductase}}
{{Infobox enzyme
| Name = Chlorophyll(ide) ''b'' reductase
| EC_number = 1.1.1.294
| CAS_number = 
| IUBMB_EC_number = 1/1/1/294
| GO_code = 
| image = 
| width = 
| caption =
}}
'''Chlorophyll(ide) ''b'' reductase''' ({{EC number|1.1.1.294}}, ''chlorophyll b reductase'', ''Chl b reductase'') is an [[enzyme]] with system name ''71-hydroxychlorophyllide-a:NAD(P)<sup>+</sup> oxidoreductase''.<ref>{{cite journal | title = Substrate specificity of chlorophyll(ide) <em>b</em> reductase in etioplasts of barley (<em>Hordeum vulgare</em> L.) |author = Scheumann, V., Ito, H., Tanaka, A., Schoch, S. and R&uuml;diger, W. |journal = Eur. J. Biochem. |year = 1996 |volume = 242 |pages = 163–170 |pmid = 8954166 |issue=1}}</ref><ref>{{cite journal | title = Chlorophyll <em>a</em> formation in the chlorophyll <em>b</em> reductase reaction requires reduced ferredoxin |author = Scheumann, V., Schoch, S. and R&uuml;diger, W. |journal = J. Biol. Chem. |year = 1998 |volume = 273 |pages = 35102–35108 |pmid = 9857045 |issue=52}}</ref><ref>{{cite journal | title = Chlorophyll degradation during senescence |author = H&ouml;rtensteiner, S. |journal = Annu. Rev. Plant Biol. |year = 2006 |volume = 57 |pages = 55–77 |pmid = 16669755 |doi=10.1146/annurev.arplant.57.032905.105212}}</ref><ref>{{cite journal | title = Conversion of chlorophyll <em>b</em> to chlorophyll <em>a</em> via 7-hydroxymethyl chlorophyll |author = Ito, H., Ohtsuka, T. and Tanaka, A. |journal = J. Biol. Chem. |year = 1996 |volume = 271 |pages = 1475–1479 |pmid = 8576141 |issue=3}}</ref><ref>{{cite journal | title = Biosynthesis of chlorophyll <em>b</em> and the chlorophyll cycle |author = R&uuml;diger, W. |journal = Photosynth. Res. |year = 2002 |volume = 74 |pages = 187–193 |pmid = 16228557 |doi=10.1023/A:1020959610952}}</ref> This enzyme [[catalysis|catalyses]] the following [[chemical reaction]]

: 71-hydroxychlorophyllide ''a'' + NAD(P)<sup>+</sup> <math>\rightleftharpoons</math> chlorophyllide ''b'' + NAD(P)H + H<sup>+</sup>

This enzyme carries out the first step in the conversion of [[chlorophyll b|chlorophyll ''b'']] to [[chlorophyll a|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 ==
{{reflist}}

== External links ==
* {{MeshName|Chlorophyll(ide)+b+reductase}}

[[Category:EC 1.1.1]]