chlorophyll(ide) b reductase EC#: 1.1.1.294; ChemWhat Code: 1373399
Product Name
chlorophyll(ide) b reductase
Example Structure
Synonyms
CBR, Chl b reductase, chlorophyll b reductase, chlorophyll(ide) b reductase, More, NOL, NON-YELLOW COLORING 1, NON-YELLOW COLORING1, NYC-like, NYC1, NYC1-LIKE
EC Number
1.1.1.294
CAS Registry Number
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 [3,4] and it also forms part of the chlorophyll cycle, which interconverts chlorophyll a and b in response to changing light conditions [5,6]. 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 71-hydroxychlorophyll [1]. Another enzyme, which requires ferredoxin but has not been characterized fully, is required to complete the conversion [3].
Cofactor
History
Reactions
7(1)-hydroxychlorophyllide a + NAD(P)(+) = chlorophyllide b + NAD(P)H.
