title: NAD-dependent methylenetetrahydrofolate dehydrogenase-methenyltetrahydrofolate cyclohydrolase in transformed cells is a mitochondrial enzyme.
abstract: Transformed mammalian cells express a unique bifunctional NAD-dependent methylenetetrahydrofolate dehydrogenase-methenyltetrahydrofolate cyclohydrolase in addition to the usual NADP-dependent dehydrogenase-cyclohydrolase-synthetase. Subcellular fractionation of murine cell lines revealed that the NAD-dependent dehydrogenase activity is located predominantly in mitochondria, while the NADP-dependent trifunctional dehydrogenase appears to exist only in the cytosol of these cells. Western analysis using monospecific polyclonal antisera confirms the subcellular distribution of these two proteins.
authors.affiliation: Department of Biochemistry, McGill University, Montreal, Que. Canada.
authors.forename: N R
authors.initials: NR
authors.lastname: Mejia
authors.forename: R E
authors.initials: RE
authors.lastname: MacKenzie
mesh_terms: D000619:Aminohydrolases / Q000302:isolation & purification / Q000378:metabolism*; D000818:Animals; D002286:Carcinoma, Ehrlich Tumor / Q000201:enzymology; D002458:Cell Fractionation; D002461:Cell Line, Transformed; D003600:Cytosol / Q000201:enzymology; D007118:Immunoassay; D008754:Methylenetetrahydrofolate Dehydrogenase (NADP) / Q000302:isolation & purification / Q000378:metabolism*; D051379:Mice; D008928:Mitochondria / Q000201:enzymology*; D009097:Multienzyme Complexes / Q000302:isolation & purification / Q000378:metabolism*; D010088:Oxidoreductases / Q000378:metabolism*
chemical_list: D009097:Multienzyme Complexes; C055342:methylene tetrahydrofolate dehydrogenase-methenyltetrahydrofolate cyclohydrolase; D010088:Oxidoreductases; D008754:Methylenetetrahydrofolate Dehydrogenase (NADP); D000619:Aminohydrolases