Functional Characterization of a Miniature Inverted Transposable Element at the Origin of mcr-5 Gene Acquisition in Escherichia coli

Antimicrob Agents Chemother. 2019 Jun 24;63(7):e00559-19. doi: 10.1128/AAC.00559-19. Print 2019 Jul.


Plasmid-mediated colistin resistance of the mobile colistin resistance (MCR) type is a growing concern in Enterobacteriaceae since it has been described worldwide in humans and animals. Here, we identified a series of MCR-producing Escherichia coli isolates corresponding to two different clones (represented by isolates PS1 and PS8b) producing MCR-1 and MCR-5, respectively, obtained from pig fecal samples in France. Plasmid analysis showed that the plasmid carrying the mcr-1 gene (pPS1) possesses an IncHI2 backbone, whereas the mcr-5 gene was carried onto a 6,268-bp nontypeable non-self-conjugative plasmid (pPS8b). Detailed analysis of plasmid pPS8b revealed a 3,803-bp-long cassette containing the mcr-5 gene that was bracketed by two inverted-repeat (IR) sequences with 5-bp-long direct repeats at each extremity, similarly to an insertion sequence, but with the exception that no transposase gene was identified within this cassette. By performing in vitro transposition experiments, we showed that the mcr-5 cassette could be mobilized by the TnAs1 transposase provided in trans, displaying a mobilization mechanism similar to that of miniature inverted-repeat transposable elements (MITEs).

Keywords: MCR; MITE; colistin; mobilization; pig; resistance; transposition.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Anti-Bacterial Agents / pharmacology
  • Colistin / pharmacology
  • DNA Transposable Elements / genetics*
  • Drug Resistance, Bacterial / genetics
  • Escherichia coli / drug effects
  • Escherichia coli / genetics*
  • Escherichia coli Infections / drug therapy
  • Escherichia coli Infections / microbiology
  • Escherichia coli Proteins / genetics*
  • France
  • Microbial Sensitivity Tests / methods
  • Plasmids / genetics
  • Swine
  • Transferases (Other Substituted Phosphate Groups) / genetics*


  • Anti-Bacterial Agents
  • DNA Transposable Elements
  • Escherichia coli Proteins
  • MCR-5 protein, E coli
  • Transferases (Other Substituted Phosphate Groups)
  • Colistin