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Background  Carbapenem resistant  Acinetobacter  species have caused great difficulties in clinical therapy in the worldwide. Here we describe an  Acinetobacter johnsonii  M19 with a novel  bla  OXA-23  containing transposon Tn 6681  on the conjugative plasmid pFM-M19 and the ability to transferand carbapenem resistance.Methods   A. johnsonii  M19 was isolated under selection with 8 mg/L meropenem from hospital sewage, and the minimum inhibitory concentrations (MICs) for the representative carbapenems imipenem, meropenem and ertapenem were determined. The genome of  A. johnsonii  M19 was sequenced by PacBio RS II and Illumina HiSeq 4000 platforms. A homologous model of OXA-23 was generated, and molecular docking models with imipenem, meropenem and ertapenem were constructed by Discovery Studio 2.0. Type IV secretion system and conjugation elements were identified by the Pathosystems Resource Integration Center (PATRIC) server and the oriTfinder. Mating experiments were performed to evaluate transfer of OXA-23 to  Escherichia coli  25DN.    Results  MICs of  A. johnsonii  M19 for imipenem, meropenem and ertapenem were 128 mg/L, 48 mg/L and 24 mg/L, respectively. Genome sequencing identified plasmid pFM-M19, which harbours the carbapenem resistance gene  bla  OXA-23  within the novel transposon Tn 6681 . Molecular docking analysis indicated that the elongated hydrophobic tunnel of OXA-23 provides a hydrophobic environment and that Lys-216, Thr-217, Met-221 and Arg-259 were the conserved amino acids bound to imipenem, meropenem and ertapenem. Furthermore, pFM-M19 could transfer  bla  OXA-23  to  E. coli  25DN by conjugation, resulting in carbapenem-resistant transconjugants.Conclusions  Our investigation showed that  A. johnsonii  M19 is a source and disseminator of  bla  OXA-23  and carbapenem resistance. The ability to transfer  bla  OXA-23  to other species by the conjugative plasmid pFM-M19 raises the risk of spread of carbapenem resistance.    Graphic abstract  The carbapenem resistance gene  bla  OXA-23  is disseminated by a conjugative plasmid containing the novel transposon Tn 6681  in  Acinetobacter johnsonii  M19.

antimicrobial resistance and infection control

The carbapenem resistance gene blaOXA-23 is disseminated by a conjugative plasmid containing the novel transposon Tn6681 in Acinetobacter johnsonii M19