Colistin resistance associated with outer membrane protein change in Klebsiella pneumoniae and Enterobacter asburiae

Kádár, Béla and Kocsis, Béla and Tóth, Ákos and Kristóf, Katalin and Felső, Péter and Kocsis, Béla and Böddi, Katalin and Szabó, Dóra (2017) Colistin resistance associated with outer membrane protein change in Klebsiella pneumoniae and Enterobacter asburiae. Acta Microbiologica et Immunologica Hungarica, 64 (2). pp. 217-227. ISSN 1217-8950

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Abstract

In this study, outer membrane proteins (OMPs) of colistin-resistant Klebsiella pneumoniae and Enterobacter asburiae were analyzed. One colistin-susceptible and three colistin-resistant K. pneumoniae sequence type 258 strains as well as one colistin-susceptible E. asburiae and its colistin-heteroresistant counterpart strain were involved in the study. OMP analysis of each strain was performed by microchip method. Matrix-assisted laser desorption ionization time of flight/mass spectrometry (MALDI-TOF/MS) investigation was carried out after separation of OMPs by two-dimensional gel electrophoresis and in-gel digestion. The MALDI-TOF/MS analysis of OMPs in the colistin-susceptible K. pneumoniae found 16 kDa proteins belonging to the LysM domain/BON superfamily, as well as DNA starvation proteins, whereas OmpX and OmpW were detected in the colistin-resistant counterpart strains. OmpC and OmpW were detected in the colistin-susceptible E. asburiae, whereas OmpA and OmpX were identified in the colistin-resistant counterpart. This study demonstrated that OMP differences were between colistin-susceptible and -resistant counterpart strains. The altered Gram-negative cell wall may contribute to acquired colistin resistance in Enterobacteriaceae.

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