blaIMP-27 on transferable plasmids in Proteus mirabilis and Providencia rettgeri

R. F. Potter, M. A. Wallace, Allison Rebecca McMullen, J. Prusa, C. L. Stallings, C. A.D. Burnham, G. Dantas

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Objectives: A carbapenem-resistant Providencia rettgeri (PR1) isolate was recovered from a wound infection in Missouri, USA. This isolate possessed an EDTA-inhibitable carbapenemase that was unidentified using the Xpert CARBA-R assay. Our objective was to elucidate the molecular determinant of carbapenem resistance in this isolate. We then sought to test the transmissibility of blaIMP-27 loci in clinical P. rettgeri and Proteus mirabilis isolates. Methods: In October 2016 the novel ambler Class B carbapenemase blaIMP-27, was reported in two different Proteus mirabilis (PM185 and PM187) isolates. Broth mating assays for transfer of carbapenemase activity were performed for the three clinical isolates with recipient sodium azide-resistant Escherichia coli J53. Antibiotic susceptibility testing and phenotypic carbapenemase activity testing were performed on the clinical isolates, J53 and transconjugants using the Kirby–Bauer disc diffusion method according to CLSI guidelines. Plasmid DNA from PM187, PR1 and their transconjugants were used as input for Nextera Illumina sequencing libraries and sequenced on a NEXTSEQ platform. Results: PR1 was resistant to both imipenem and meropenem. PM187 and PR1 could transfer resistance to E. coli through plasmid conjugation (pPM187 and pPR1). pPM187 had a virB/virD4 type IV secretion system whereas pPR1 had a traB/traD type IV secretion system. Conclusion: Two of three blaIMP-27-bearing clinical isolates tested could conjugate resistance into E. coli. The resulting transconjugants became positive for phenotypic carbapenemase production but did not pass clinical resistance breakpoints. blaIMP-27 can be transmitted on different plasmid replicon types that rely on distinct classes of type IV secretion system for horizontal transfer.

Original languageEnglish (US)
Pages (from-to)1019.e5-1019.e8
JournalClinical Microbiology and Infection
Issue number9
StatePublished - Sep 2018


  • Carbapenem resistance
  • Horizontal gene transfer
  • Proteus mirabilis
  • Providencia rettgeri
  • bla

ASJC Scopus subject areas

  • Microbiology (medical)
  • Infectious Diseases


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