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      Contribution of EmrAB efflux pumps to colistin resistance in Acinetobacter baumannii.

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          Abstract

          Efflux pumps play an important role in antimicrobial resistance for Acinetobacter baumannii. However, the function of the Emr pump system and the relationship between Emr and drug resistance has not been characterized in A. baumannii. In this study, four possible groups of emr-like genes were found by searching a genome database. Among them, A1S_1772 (emrB) and A1S_1773 (emrA) were demonstrated to be co-transcribed as a single operon. Moreover, during osmotic stress, A1S_1772 showed the largest change in gene expression compared to the other emrB-like genes, and deletion of A1S_1772 (AB ΔemrB) significantly slowed cell growth in 20% sucrose. Using a phenotypic microarray analysis, the AB ΔemrB mutant was more susceptible to colistin and nafcillin, paromomycin, spiramycin, and D,L-serine hydroxmate than the wild type. The spot assay, time kill assay and minimal inhibition concentration determination also indicated that the wild type could tolerate colistin better than the AB ΔemrB mutant. Finally, the increased expression levels of all emrB-like genes, including A1S_0775, A1S_0909, A1S_1772, and A1S_1799, in colistin resistance-induced A. baumannii further supported the possible involvement of the emrB genes in A. baumannii colistin resistance. Together, the Emr pump systems in A. baumannii contribute to adaptation to osmotic stress and resistance to colistin.

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          Author and article information

          Journal
          J. Microbiol.
          Journal of microbiology (Seoul, Korea)
          Springer Nature
          1976-3794
          1225-8873
          Feb 2017
          : 55
          : 2
          Affiliations
          [1 ] Department of Medicine, National Taiwan University Hospital Chu-Tung Branch, Hsin-Chu County, Taiwan.
          [2 ] Institute of Molecular and Cellular Biology, National Tsing Hua University, Hsin-Chu City, Taiwan.
          [3 ] Institute of Molecular and Cellular Biology, National Tsing Hua University, Hsin-Chu City, Taiwan. cylan@life.nthu.edu.tw.
          [4 ] Department of Life Science, National Tsing Hua University, Hsin-Chu City, Taiwan. cylan@life.nthu.edu.tw.
          Article
          10.1007/s12275-017-6408-5
          10.1007/s12275-017-6408-5
          28120193

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