Characterization of the gene for chromosomal trimethoprim-sensitive dihydrofolate reductase of Staphylococcus aureus ATCC 25923.
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Dale GE, Then RL, Stuber D
Characterization of the gene for chromosomal trimethoprim-sensitive dihydrofolate reductase of Staphylococcus aureus ATCC 25923.
Antimicrob Agents Chemother. 1993 Jul;37(7):1400-5.
- PubMed ID
- 8363365 [ View in PubMed]
- 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.