Journal article

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Heteroresistance to colistin in Klebsiella pneumoniae associated with alterations in the PhoPQ regulatory system

  • Jayol, Aurélie Medical and Molecular Microbiology Unit, Department of Medicine, Faculty of Science, University of Fribourg, Switzerland
  • Nordmann, Patrice Medical and Molecular Microbiology Unit, Department of Medicine, Faculty of Science, University of Fribourg, Switzerland - HFR–Hôpital Cantonal de Fribourg, Fribourg, Switzerland
  • Brink, Adrian Department of Clinical Microbiology, Ampath National Laboratory Services, Milpark Hospital, Johannesburg, South Africa
  • Poirel, Laurent Medical and Molecular Microbiology Unit, Department of Medicine, Faculty of Science, University of Fribourg, Switzerland
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    05.01.2015
Published in:
  • Antimicrobial Agents and Chemotherapy. - 2015, vol. 59, no. 5, p. 2780–2784
English A multidrug-resistant Klebsiella pneumoniae isolate exhibiting heteroresistance to colistin was investigated. The colistin-resistant subpopulation harbored a single amino acid change (Asp191Tyr) in protein PhoP, which is part of the PhoPQ two-component system that activates pmrHFIJKLM expression responsible for l-aminoarabinose synthesis and polymyxin resistance. Complementation assays with a wild-type phoP gene restored full susceptibility to colistin. Then, analysis of the colistin-susceptible subpopulation showed a partial deletion (25 bp) in the phoP gene compared to that in the colistin-resistant subpopulation. That deletion disrupted the reading frame of phoP, leading to a longer and inactive protein (255 versus 223 amino acids long). This is the first report showing the involvement of mutation(s) in PhoP in colistin resistance. Furthermore, this is the first study to decipher the mechanisms leading to colistin heteroresistance in K. pneumoniae.
Faculty
Faculté des sciences et de médecine
Department
Médecine 3ème année
Language
  • English
Classification
Biology
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/304158
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