Reaction: 5,10-methylenetetrahydrofolate + NADP+ = 5,10-methenyltetrahydrofolate + NADPH + H+
For diagram of reaction click here (another example).
Other name(s): N5,N10-methylenetetrahydrofolate dehydrogenase; 5,10-methylenetetrahydrofolate:NADP oxidoreductase; 5,10-methylenetetrahydrofolate dehydrogenase; methylenetetrahydrofolate dehydrogenase; methylenetetrahydrofolate dehydrogenase (NADP)
Systematic name: 5,10-methylenetetrahydrofolate:NADP+ oxidoreductase
Comments: In eukaryotes, occurs as a trifunctional enzyme also having methenyltetrahydrofolate cyclohydrolase (EC 3.5.4.9) and formate—tetrahydrofolate ligase (EC 6.3.4.3) activity. In some prokaryotes occurs as a bifunctional enzyme also having methenyltetrahydrofolate cyclohydrolase activity (EC 3.5.4.9).
Links to other databases: BRENDA, EXPASY, GTD, KEGG, Metacyc, PDB, CAS registry number: 9029-14-5
References:
1. Hatefi, Y., Osborn, M.J., Kay, L.D. and Huennekens, F.M. Hydroxymethyl tetrahydrofolic dehydrogenase. J. Biol. Chem. 227 (1957) 637-647.
2. Osborn, M.J. and Huennekens, F.M. Participation of anhydroleucovorin in the hydroxymethyl tetrahydrofolic dehydrogenase system. Biochim. Biophys. Acta 26 (1957) 646-647.
3. Ramasastri, B.V. and Blakley, R.L. 5,10-Methylenetetrahydrofolic acid dehydrogenase from Bakers' yeast. I. Partial purification and some properties. J. Biol. Chem. 237 (1962) 1982-1988.
4. Yeh, Y.-C. and Greenberg, D.M. Purification and properties of N5,N10-methylenetetrahydrofolate dehydrogenase of calf thymus. Biochim. Biophys. Acta 105 (1965) 279-291. [PMID: 4379024]