Cob(II)alamin reductase

cob(II)alamin reductase
Identifiers
EC number	1.16.1.4
CAS number	37256-40-9
Databases
IntEnz	IntEnz view
BRENDA	BRENDA entry
ExPASy	NiceZyme view
KEGG	KEGG entry
MetaCyc	metabolic pathway
PRIAM	profile
PDB structures	RCSB PDB PDBe PDBsum
Gene Ontology	AmiGO / EGO
Search PMC articles PubMed articles

In enzymology, a cob(II)alamin reductase (EC 1.16.1.4) is an enzyme that catalyzes the chemical reaction

2 cob(I)alamin + NAD⁺ $\rightleftharpoons$ 2 cob(II)alamin + NADH + H⁺

Thus, the two substrates of this enzyme are cob(I)alamin and NAD⁺, whereas its 3 products are cob(II)alamin, NADH, and H⁺.

This enzyme belongs to the family of oxidoreductases, specifically those oxidizing metal ion with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is cob(I)alamin:NAD+ oxidoreductase. Other names in common use include vitamin B12r reductase, B12r reductase, and NADH2:cob(II)alamin oxidoreductase. This enzyme participates in porphyrin and chlorophyll metabolism. It employs one cofactor, FAD.

References

• Walker GA, Murphy S, Huennekens FM (1969). "Enzymatic conversion of vitamin B 12a to adenosyl-B 12: evidence for the existence of two separate reducing systems". Arch. Biochem. Biophys. 134 (1): 95–102. doi:10.1016/0003-9861(69)90255-0. PMID 4390543. 

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