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• W1978707497 endingPage "1094" @default.
• W1978707497 startingPage "1086" @default.
• W1978707497 abstract "Transport processes are used by all organisms to obtain essential nutrients and to expel wastes and other potentially harmful substances from cells. Such processes are important means by which resistance to selected antimicrobial agents in bacteria is achieved. The recently described Staphylococcus aureus norA gene encodes a membrane-associated protein that mediates active efflux of fluoroquinolones from cells. SA-1199B is a fluoroquinolone-resistant strain of S. aureus from which we cloned an allele of norA (norA1199). Similar to that of norA, the protein product of norA1199 preferentially mediates efflux of hydrophilic fluoroquinolones in both S. aureus and an Escherichia coli host, a process driven by the proton motive force. Determination of the nucleotide sequence of norA1199 revealed an encoded 388-amino-acid hydrophobic polypeptide 95% homologous with the norA-encoded protein. Significant homology with other proteins involved in transport processes also exists, but especially with tetracycline efflux proteins and with the Bacillus subtilis Bmr protein that mediates active efflux of structurally unrelated compounds, including fluoroquinolones. In S. aureus, the norA1199-encoded protein also appears to function as a multidrug efflux transporter. Southern hybridization studies indicated that norA1199 (or an allele of it) is a naturally occurring S. aureus gene and that related sequences are present in the S. epidermidis genome. The nucleotide sequence of the wild-type allele of norA1199, cloned from the fluoroquinolone-susceptible parent strain of SA-1199B, did not differ from that of norA1199 throughout the coding region. Northern (RNA) and Southern hybridization studies showed that increased transcription, and not gene amplification, of norA1199 is the basis for fluoroquinolone resistance in SA-1199B." @default.
• W1978707497 created "2016-06-24" @default.
• W1978707497 creator A5011362369 @default.
• W1978707497 creator A5046985728 @default.
• W1978707497 creator A5066014473 @default.
• W1978707497 date "1993-05-01" @default.
• W1978707497 modified "2023-09-26" @default.
• W1978707497 title "Efflux-mediated fluoroquinolone resistance in Staphylococcus aureus" @default.
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• W1978707497 doi "https://doi.org/10.1128/aac.37.5.1086" @default.
• W1978707497 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/187905" @default.
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