title: Characterization of the gene for chromosomal trimethoprim-sensitive dihydrofolate reductase of Staphylococcus aureus ATCC 25923.
abstract: The gene for the trimethoprim-sensitive (Tmps) chromosomal dihydrofolate reductase (DHFR) of Staphylococcus aureus ATCC 25923 was cloned and characterized. The structural gene encodes a polypeptide of 159 amino acid residues and has a calculated molecular weight of 18,251. The amino acid sequences of this Tmps DHFR and those of the trimethoprim-resistant type S1 DHFR encoded by transposon Tn4003 are 80% identical. In contrast to the trimethoprim-resistant enzyme, the Tmps DHFR can be highly overexpressed in Escherichia coli, with most of the recombinant protein occurring in a soluble and an active form.
authors.affiliation: Department of New Technologies, F. Hoffmann-La Roche Ltd., Basel, Switzerland.
authors.forename: G E
authors.initials: GE
authors.lastname: Dale
authors.forename: R L
authors.initials: RL
authors.lastname: Then
authors.forename: D
authors.initials: D
authors.lastname: Stüber
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002876:Chromosomes, Bacterial / Q000502:physiology*; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics; D015870:Gene Expression / Q000235:genetics; D005798:Genes, Bacterial / Q000235:genetics; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000235:genetics; D017386:Sequence Homology, Amino Acid; D013211:Staphylococcus aureus / Q000201:enzymology* / Q000235:genetics*; D013762:Tetrahydrofolate Dehydrogenase / Q000235:genetics*; D014296:Trimethoprim Resistance / Q000235:genetics*
chemical_list: D011994:Recombinant Proteins; D013762:Tetrahydrofolate Dehydrogenase