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The product of the qacC gene of Staphylococcus epidermidis CH mediates resistance to β-lactam antibiotics in Gram-positive and Gram-negative bacteria

  • Derie E. Fuentes
  • , Claudio A. Navarro
  • , Juan C. Tantaleán
  • , Manuel A. Araya
  • , Claudia P. Saavedra
  • , José M. Pérez
  • , Iván L. Calderón
  • , Phil A. Youderian
  • , Guido C. Mora
  • , Claudio C. Vásquez
  • Lab. de Microbiol. Molecular
  • Universidad de Santiago de Chile
  • Depto. de Ciencias Biológicas
  • Universidad Andrés Bello
  • Department of Biology
  • Texas A&M University

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

We have characterized a natural isolate of Staphylococcus epidermidis resistant to heavy metals that carries a small 2391-bp plasmid, pSepCH, encoding the qacC gene. The S. epidermidis qacC gene confers resistance to a number of β-lactam antibiotics and to ethidium bromide in its natural host and in Escherichia coli K12 and Salmonella enterica sv. Typhimurium. This is the first communication of a small multidrug resistance (SMR) pump involved in resistance to β-lactam antibiotics. Experiments using tolC, ompW and ompD mutant strains of S. Typhimurium demonstrated that the β-lactam antibiotic resistance conferred by this pump does not depend on these outer membrane proteins.

Original languageEnglish
Pages (from-to)472-477
Number of pages6
JournalResearch in Microbiology
Volume156
Issue number4
DOIs
StatePublished - May 2005

Keywords

  • Ethidium bromide
  • Multidrug resistance
  • SMR
  • Staphylococcus epidermidis
  • qacC
  • β-Lactam resistance

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