Information on EC - methylenetetrahydrofolate reductase (NADH)

for references in articles please use BRENDA:EC1.5.1.54
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IUBMB Comments
A flavoprotein (FAD). The enzyme, found in plants and some bacteria, catalyses the reversible conversion of 5,10-methylenetetrahydrofolate to 5-methyltetrahydrofolate using NADH as the electron donor. It play an important role in folate metabolism by regulating the distribution of one-carbon moieties between cellular methylation reactions and nucleic acid synthesis. These proteins either contain a C-terminal domain that does not mediate allosteric regulation (as in plants) or lack this domain entirely (as in Escherichia coli). As a result, the plant enzymes are not inhibited by S-adenosyl-L-methionine, unlike other eukaryotic enzymes, and catalyse a reversible reaction. cf. EC, methylenetetrahydrofolate reductase (NADPH); EC, methylenetetrahydrofolate reductase [NAD(P)H]; and EC, methylenetetrahydrofolate reductase (ferredoxin).
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The expected taxonomic range for this enzyme is: Bacteria, Eukaryota
mthfr1, msmeg_6596, msmeg_6649, more
5-methyltetrahydrofolate + NAD+ = 5,10-methylenetetrahydrofolate + NADH + H+
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