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EC 1.5.1.20 Details

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EC number

1.5.1.20

Accepted name

methylenetetrahydrofolate reductase [NAD(P)H]

Reaction

5-methyltetrahydrofolate + NAD(P)⁺ = 5,10-methylenetetrahydrofolate + NAD(P)H + H⁺

Other name(s)

MTHFR (gene name)

Systematic name

5-methyltetrahydrofolate:NAD(P)⁺ oxidoreductase

CAS registry number

71822-25-8

Comment

A flavoprotein (FAD). The enzyme catalyses the reversible conversion of 5,10-methylenetetrahydrofolate to 5-methyltetrahydrofolate, playing an important role in folate metabolism by regulating the distribution of one-carbon moieties between cellular methylation reactions and nucleic acid synthesis. This enzyme, characterized from Protozoan parasites of the genus Leishmania, is unique among similar characterized eukaryotic enzymes in that it lacks the C-terminal allosteric regulatory domain (allowing it to catalyse a reversible reaction) and uses NADH and NADPH with equal efficiency under physiological conditions. cf. EC 1.5.1.53, methylenetetrahydrofolate reductase (NADPH); EC 1.5.1.54, methylenetetrahydrofolate reductase (NADH); and EC 1.5.7.1, methylenetetrahydrofolate reductase (ferredoxin).

History

created 1978 as EC 1.1.1.171, transferred 1984 to EC 1.5.1.20 (EC 1.7.99.5 incorporated 2005), modified 2005., modified 2021

EC Tree

1 Oxidoreductases

1.1 Acting on the CH-OH group of donors

1.1.1 With NAD⁺ or NADP⁺ as acceptor

1.1.2 With a cytochrome as acceptor

1.1.3 With oxygen as acceptor

1.1.4 With a disulfide as acceptor

1.1.5 With a quinone or similar compound as acceptor

1.1.7 With an iron-sulfur protein as acceptor

1.1.9 With a copper protein as acceptor

1.1.98 With other, known, physiological acceptors

1.1.99 With unknown physiological acceptors

1.1.99.1 choline dehydrogenase

1.1.99.2 L-2-hydroxyglutarate dehydrogenase

1.1.99.3 gluconate 2-dehydrogenase (acceptor)

1.1.99.4 dehydrogluconate dehydrogenase

1.1.99.5 glycerol-3-phosphate dehydrogenase

1.1.99.6 D-lactate dehydrogenase (acceptor)

1.1.99.7 lactate—malate transhydrogenase

1.1.99.8 alcohol dehydrogenase (acceptor)

1.1.99.9 pyridoxine 5-dehydrogenase

1.1.99.10 glucose dehydrogenase (acceptor)

1.1.99.11 fructose 5-dehydrogenase

1.1.99.12 sorbose dehydrogenase

1.1.99.13 glucoside 3-dehydrogenase (acceptor)

1.1.99.14 glycolate dehydrogenase

1.1.99.15 created 1978, deleted 1980

1.1.99.16 malate dehydrogenase (acceptor)

1.1.99.17 created 1982, deleted 2003

1.1.99.18 cellobiose dehydrogenase (acceptor)

1.1.99.19 uracil dehydrogenase

1.1.99.20 alkan-1-ol dehydrogenase (acceptor)

1.1.99.21 D-sorbitol dehydrogenase (acceptor)

1.1.99.22 glycerol dehydrogenase (acceptor)

1.1.99.23 polyvinyl-alcohol dehydrogenase (acceptor)

1.1.99.24 hydroxyacid-oxoacid transhydrogenase

1.1.99.25 quinate dehydrogenase (pyrroloquinoline-quinone)

1.1.99.26 3-hydroxycyclohexanone dehydrogenase

1.1.99.27 (R)-pantolactone dehydrogenase (flavin)

1.1.99.28 glucose-fructose oxidoreductase

1.1.99.29 pyranose dehydrogenase (acceptor)

1.1.99.30 2-oxo-acid reductase

1.1.99.31 (S)-mandelate dehydrogenase

1.1.99.32 L-sorbose 1-dehydrogenase

1.1.99.33 formate dehydrogenase (acceptor)

1.1.99.34 glucose-6-phosphate dehydrogenase (coenzyme-F₄₂₀)

1.1.99.35 soluble quinoprotein glucose dehydrogenase

1.1.99.36 alcohol dehydrogenase (nicotinoprotein)

1.1.99.37 methanol dehydrogenase (nicotinoprotein)

1.1.99.38 2-deoxy-scyllo-inosamine dehydrogenase (AdoMet-dependent)

1.1.99.39 D-2-hydroxyglutarate dehydrogenase

1.1.99.40 (R)-2-hydroxyglutarate—pyruvate transhydrogenase

1.1.99.41 3-hydroxy-1,2-didehydro-2,3-dihydrotabersonine reductase

1.1.99.42 4-pyridoxic acid dehydrogenase

1.2 Acting on the aldehyde or oxo group of donors

1.3 Acting on the CH-CH group of donors

1.4 Acting on the CH-NH₂ group of donors

1.5 Acting on the CH-NH group of donors

1.5.1 With NAD⁺ or NADP⁺ as acceptor

1.5.1.1 1-piperideine-2-carboxylate/1-pyrroline-2-carboxylate reductase [NAD(P)H]

1.5.1.2 pyrroline-5-carboxylate reductase

1.5.1.3 dihydrofolate reductase

1.5.1.4 created 1961, deleted 1976

1.5.1.5 methylenetetrahydrofolate dehydrogenase (NADP⁺)

1.5.1.6 formyltetrahydrofolate dehydrogenase

1.5.1.7 saccharopine dehydrogenase (NAD⁺, L-lysine-forming)

1.5.1.8 saccharopine dehydrogenase (NADP⁺, L-lysine-forming)

1.5.1.9 saccharopine dehydrogenase (NAD⁺, L-glutamate-forming)

1.5.1.10 saccharopine dehydrogenase (NADP⁺, L-glutamate-forming)

1.5.1.11 D-octopine dehydrogenase

1.5.1.12 1-pyrroline-5-carboxylate dehydrogenase

1.5.1.13 created 1972, deleted 2004

1.5.1.14 created 1976, deleted 1989

1.5.1.15 methylenetetrahydrofolate dehydrogenase (NAD⁺)

1.5.1.16 D-lysopine dehydrogenase

1.5.1.17 alanopine dehydrogenase

1.5.1.18 ephedrine dehydrogenase

1.5.1.19 D-nopaline dehydrogenase

1.5.1.20 methylenetetrahydrofolate reductase [NAD(P)H]

1.5.1.21 1-piperideine-2-carboxylate/1-pyrroline-2-carboxylate reductase (NADPH)

1.5.1.22 strombine dehydrogenase

1.5.1.23 tauropine dehydrogenase

1.5.1.24 N⁵-(carboxyethyl)ornithine synthase

1.5.1.25 thiomorpholine-carboxylate dehydrogenase

1.5.1.26 β-alanopine dehydrogenase

1.5.1.27 1,2-dehydroreticulinium reductase (NADPH)

1.5.1.28 opine dehydrogenase

1.5.1.29 FMN reductase [NAD(P)H]

1.5.1.30 flavin reductase (NADPH)

1.5.1.31 berberine reductase

1.5.1.32 vomilenine reductase

1.5.1.33 pteridine reductase

1.5.1.34 6,7-dihydropteridine reductase

1.5.1.35 1-pyrroline dehydrogenase

1.5.1.36 flavin reductase (NADH)

1.5.1.37 FAD reductase (NADH)

1.5.1.38 FMN reductase (NADPH)

1.5.1.39 FMN reductase [NAD(P)H]

1.5.1.40 8-hydroxy-5-deazaflavin:NADPH oxidoreductase

1.5.1.41 riboflavin reductase [NAD(P)H]

1.5.1.42 FMN reductase (NADH)

1.5.1.43 carboxynorspermidine synthase

1.5.1.44 festuclavine dehydrogenase

1.5.1.45 FAD reductase [NAD(P)H]

1.5.1.46 agroclavine dehydrogenase

1.5.1.47 dihydromethanopterin reductase [NAD(P)⁺]

1.5.1.48 2-methyl-1-pyrroline reductase

1.5.1.49 1-pyrroline-2-carboxylate reductase [NAD(P)H]

1.5.1.50 dihydromonapterin reductase

1.5.1.51 N-[(2S)-2-amino-2-carboxyethyl]-L-glutamate dehydrogenase

1.5.1.52 staphylopine dehydrogenase

1.5.1.53 methylenetetrahydrofolate reductase (NADPH)

1.5.1.54 methylenetetrahydrofolate reductase (NADH)

1.5.3 With oxygen as acceptor

1.5.4 With a disulfide as acceptor

1.5.5 With a quinone or similar compound as acceptor

1.5.7 With an iron-sulfur protein as acceptor

1.5.8 With a flavin or flavoprotein as acceptor

1.5.98 With other, known, physiological acceptors

1.5.99 With unknown physiological acceptors

1.6 Acting on NADH or NADPH

1.7 Acting on other nitrogenous compounds as donors

1.8 Acting on a sulfur group of donors

1.9 Acting on a heme group of donors

1.10 Acting on diphenols and related substances as donors

1.11 Acting on a peroxide as acceptor

1.12 Acting on hydrogen as donor

1.13 Acting on single donors with incorporation of molecular oxygen (oxygenases)

1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen

1.15 Acting on superoxide as acceptor

1.16 Oxidizing metal ions

1.17 Acting on CH or CH₂ groups

1.18 Acting on iron-sulfur proteins as donors

1.19 Acting on reduced flavodoxin as donor

1.20 Acting on phosphorus or arsenic in donors

1.21 Catalysing the reaction X-H + Y-H = X-Y

1.21.1 With NAD⁺ or NADP⁺ as acceptor

1.21.3 With oxygen as acceptor

1.21.4 With a disulfide as acceptor

1.21.98 With other, known, physiological acceptors

1.21.99 With unknown physiological acceptors

1.22 Acting on halogen in donors

1.23 Reducing C-O-C group as acceptor

1.97 Other oxidoreductases

1.98 Enzymes using H₂ as reductant (deleted subclass)

1.99 Other enzymes using O₂ as oxidant (deleted subclass)

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Release 2023.1 (January 2023)