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Methylenetetrahydrofolate dehydrogenase (NAD+)

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In enzymology, methylenetetrahydrofolate dehydrogenase (NAD+) (EC 1.5.1.15) is an enzyme that catalyzes the chemical reaction.[1]

 
 
 
H+
Reversible left-right reaction arrow with minor forward product(s) to top right and minor reverse substrate(s) from bottom right
 
H+
 
 

The two substrates of this enzyme are 5,10-methylenetetrahydrofolate and oxidised nicotinamide adenine dinucleotide (NAD+). Its products are 5,10-methenyltetrahydrofolate, reduced NADH, and a proton.[2][3]

This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-NH group of donors with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is 5,10-methylenetetrahydrofolate:NAD+ oxidoreductase. This enzyme is also called methylenetetrahydrofolate dehydrogenase (NAD+). This enzyme participates in one carbon pool by folate.[4]

Structural studies

As of late 2007, two structures have been solved for this class of enzymes, with PDB accession codes PDB: 1EDZ​ and PDB: 1EE9​.[5]

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