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Curr Microbiol. 2019 May;76(5):644-649. doi: 10.1007/s00284-019-01672-1. Epub 2019 Mar 19.

PmrAB and PhoPQ Variants in Colistin-Resistant Enterobacter spp. Isolates in Korea.

Author information

1
Department of Molecular Cell Biology and Samsung Medical Center, Sungkyunkwan University School of Medicine, Suwon, 16419, Republic of Korea.
2
Department of Molecular Cell Biology and Samsung Medical Center, Sungkyunkwan University School of Medicine, Suwon, 16419, Republic of Korea. ksko@skku.edu.

Abstract

In this study, we investigated the amino acid variations and mRNA expression of PhoPQ and PmrAB two-component regulatory systems in colistin-resistant Enterobacter cloacae isolates from Korea. We determined the nucleotide sequences of phoP, phoQ, pmrA, and pmrB in 51 colistin-resistant, 5 colistin-susceptible, and 8 skip-well isolates and consequently, the corresponding amino acid sequences as well. PhoPQ and PmrAB sequences showed large variations among the isolates (14, 67, 20, and 68 sites, respectively). Although there was some discrepancy between the genes, the colistin-resistant E. cloacae isolates were grouped into four clades and the susceptible isolates were grouped into two clades. We did not find any distinct amino acid substitutions associated with colistin resistance. Furthermore, mRNA expression of phoQ and pmrB was not significantly higher in the colistin-resistant isolates. Our data suggests that the colistin resistance mechanisms might be different in E. cloacae when compared to other gram-negative bacteria.

PMID:
30891622
DOI:
10.1007/s00284-019-01672-1
[Indexed for MEDLINE]

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