MeSH definition : An NADP-dependent oxidoreductase that catalyses the conversion of 5,10-methyleneterahydrofolate
to 5,10-methenyl-tetrahydrofolate. In higher eukaryotes a trifunctional enzyme exists
with additional METHENYLTETRAHYDROFOLATE CYCLOHYDROLASE and FORMATE-TETRAHYDROFOLATE
LIGASE activity. The enzyme plays an important role in the synthesis of 5-methyltetrahydrofolate,
the methyl donor for the VITAMIN B12-dependent remethylation of HOMOCYSTEINE to METHIONINE
via METHIONINE SYNTHETASE.;
An NADP-dependent oxidoreductase that catalyses the conversion of 5,10-methyleneterahydrofolate
to 5,10-methenyl-tetrahydrofolate. In higher eukaryotes a trifunctional enzyme exists
with additional METHENYLTETRAHYDROFOLATE CYCLOHYDROLASE and FORMATE-TETRAHYDROFOLATE
LIGASE activity. The enzyme plays an important role in the synthesis of 5-methyltetrahydrofolate,
the methyl donor for the VITAMIN B12-dependent remethylation of HOMOCYSTEINE to METHIONINE
via METHIONINE SYNTHETASE.