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• W2958025668 abstract "Listeria monocytogenes the causative agent of listeriosis is an important public health concern and food safety challenge. Increased tolerance of this bacterium to benzalkonium chloride (BC), an antibacterial agent widely used in industrial settings, is a growing issue. Plasmid pLMST6 harbouring the gene of the multidrug efflux pump protein EmrC has been recently linked to enhanced BC tolerance and meningitis due to L. monocytogenes ST6 strains. In this study, occurrence and contribution of this plasmid to BC tolerance was examined using PCR, plasmid curing and transformation, RT-qPCR and proteome analysis, respectively. Furthermore, the substrate specificity of the pLMST6 associated EmrC efflux pump and the impact of the plasmid on L. monocytogenes virulence was investigated. pLMST6 was detected in 7 (1.6%) of 439 L. monocytogenes strains isolated from different sources. A phenotypic role of this plasmid in conferring increased BC tolerance was confirmed by showing that plasmid cure increases BC susceptibility whereas plasmid complementation and transformation increased BC tolerance in different L. monocytogenes genetic backgrounds and L. innocua. RT-qPCR showed that BC stress exposure strongly induces the expression of mRNAs associated with pLMST6 genes for EmrC and a TetR transcription regulator. A full proteome analysis in a plasmid harbouring L. monocytogenes strain revealed that the pLMST6 encoded putative TetR family transcription regulator protein is the most upregulated protein in response to BC stress exposure. An investigation into the EmrC efflux pump’s substrate spectrum showed that while pLMST6 confers increased tolerance to other quaternary ammonium compounds (QACs) based disinfectants it has no impact on the sensitivity of L. monocytogenes to non-QAC disinfectants as well as on antibiotics such as ampicillin, tetracycline and gentamycin. A reduction in the survival of zebrafish embryos infected with pLMST6 plasmid harbouring L. monocytogenes strains was observed when compared with plasmid cured variants of the same strains suggesting that some pLMST6 harboured genes might contribute to increased virulence capacity. Overall these results confirm the phenotypic contribution of pLMST6 plasmid in promoting and dissemination of BC tolerance in L. monocytogenes as well as provide new insights on different molecular levels of pLMST6 associated genes in response to BC stress." @default.
• W2958025668 created "2019-07-23" @default.
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• W2958025668 date "2019-07-09" @default.
• W2958025668 modified "2023-10-13" @default.
• W2958025668 title "New Insights on the Role of the pLMST6 Plasmid in Listeria monocytogenes Biocide Tolerance and Virulence" @default.
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• W2958025668 doi "https://doi.org/10.3389/fmicb.2019.01538" @default.
• W2958025668 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6629823" @default.
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