Divinyl chlorophyllide a 8-vinyl-reductase | |||||||||
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Identifiers | |||||||||
EC no. | 1.3.1.75 | ||||||||
Databases | |||||||||
IntEnz | IntEnz view | ||||||||
BRENDA | BRENDA entry | ||||||||
ExPASy | NiceZyme view | ||||||||
KEGG | KEGG entry | ||||||||
MetaCyc | metabolic pathway | ||||||||
PRIAM | profile | ||||||||
PDB structures | RCSB PDB PDBe PDBsum | ||||||||
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In enzymology, divinyl chlorophyllide a 8-vinyl-reductase (EC 1.3.1.75) is an enzyme that catalyzes the chemical reaction
The three substrates of this enzyme are 3,8-divinylprotochlorophyllide, NADPH, and H+; its two products are protochlorophyllide and NADP+. This enzyme can also convert alternative substrates, for example 3,8-divinyl chlorophyllide a and in all cases reduces a single specific vinyl group to an ethyl group.
This enzyme belongs to the family of oxidoreductases. The systematic name of this enzyme class is chlorophyllide-a :NADP+ oxidoreductase. Other names in common use include 3,8-divinyl protochlorophyllide a 8-vinyl-reductase, [4-vinyl]chlorophyllide a reductase, and 4VCR. This enzyme is part of the biosynthetic pathway to chlorophylls.
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In enzymology, protochlorophyllide reductases (POR) are enzymes that catalyze the conversion from protochlorophyllide to chlorophyllide a. They are oxidoreductases participating in the biosynthetic pathway to chlorophylls.
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Protochlorophyllide, or monovinyl protochlorophyllide, is an intermediate in the biosynthesis of chlorophyll a. It lacks the phytol side-chain of chlorophyll and the reduced pyrrole in ring D. Protochlorophyllide is highly fluorescent; mutants that accumulate it glow red if irradiated with blue light. In angiosperms, the later steps which convert protochlorophyllide to chlorophyll are light-dependent, and such plants are pale (chlorotic) if grown in the darkness. Gymnosperms, algae, and photosynthetic bacteria have another, light-independent enzyme and grow green in the darkness as well.
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