title: N-terminal amino acid sequence of the chromosomal dihydrofolate reductase purified from trimethoprim-resistant Staphylococcus aureus.
abstract: The existence of two distinct dihydrofolate reductases (DHFR) in highly trimethoprim-resistant clinical isolates has been unequivocally demonstrated. The enzymes have been characterized with regard to the affinity for substrates and sensitivity to inhibitors. The chromosomal, trimethoprim-sensitive DHFR was purified to homogeneity by a new simple two-step procedure. Its N-terminal amino acid sequence, determined up to the first 35 amino acids, showed 69% homology with the Escherichia coli DHFR.
authors.affiliation: Pharmaceutical Research Department, F. Hoffmann-La Roche & Co. Ltd, Basel, Switzerland.
authors.forename: P G
authors.initials: PG
authors.lastname: Hartman
authors.forename: M
authors.initials: M
authors.lastname: Stähli
authors.forename: H P
authors.initials: HP
authors.lastname: Kocher
authors.forename: R L
authors.initials: RL
authors.lastname: Then
mesh_terms: D000595:Amino Acid Sequence; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000201:enzymology; D008727:Methotrexate / Q000494:pharmacology; D008969:Molecular Sequence Data; D008970:Molecular Weight; D012689:Sequence Homology, Nucleic Acid; D013211:Staphylococcus aureus / Q000187:drug effects / Q000201:enzymology*; D013762:Tetrahydrofolate Dehydrogenase / Q000302:isolation & purification*; D014296:Trimethoprim Resistance
chemical_list: D013762:Tetrahydrofolate Dehydrogenase; D008727:Methotrexate