当前位置： SCI文献检索 > WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY期刊下所有文献 > Mutational analyses of regulatory genes, mexR, nalC, nalD and mexZ of mexAB-oprM and mexXY operons, in efflux pump hyperexpressing multidrug-resistant clinical isolates of Pseudomonas aeruginosa.

Mutational analyses of regulatory genes, mexR, nalC, nalD and mexZ of mexAB-oprM and mexXY operons, in efflux pump hyperexpressing multidrug-resistant clinical isolates of Pseudomonas aeruginosa.

Abstract：

:The present study deals with membrane-bound efflux pumps, MexAB-OprM and MexXY and their respective regulatory genes mexR, nalC, nalD and mexZ in multidrug resistant (MDR) Pseudomonas aeruginosa. Following antibiotic sensitivity testing and detection of various beta-lactamases, hyperexpression of efflux pump genes, mexB and mexY in the isolates was investigated using semi-quantitative and real-time reverse transcription-PCR. Amplicons from regulatory genes were sequenced and subjected to mutational and phylogenetic analysis. Twenty-nine clinical isolates of P. aeruginosa were obtained from a total of 144 MDR gram-negative bacteria collected from Kerala State, South India. All strains were found to be resistant to ampicillin and nalidixic acid with 13.8, 44.8 and 31% testing positive for extended-spectrum beta-lactamases, metallo-beta-lactamases and AmpC producers respectively. Increased mexB and mexY transcription was detected respectively in 10.3 and 20.7% of the isolates in comparison with P. aeruginosa reference strain, PAO (MTCC). Co-expression of MexY was also observed in MexB overproducers. Various synonymous/and non-synonymous mutations in regulatory gene sequences of efflux pump operons were detected. In the strain designate Pa16, mexR was found to harbour four novel point mutations with one transversion and three transitions which included a substitution of an ochre codon with that for serine. The gene also displayed a novel mutation involving insertion of a cysteine at the 444th base position, followed by an opal codon. The genetic divergence and homogeneity of the concatenated (mexR, nalC and nalD) regulatory gene sequences of mexAB-oprM operon was apparent in the phylogram generated with similar sequences retrieved from public database.

journal_name

World J Microbiol Biotechnol

journal_title

World journal of microbiology & biotechnology

authors

Suresh M,Nithya N,Jayasree PR,Vimal KP,Manish Kumar PR

doi

10.1007/s11274-018-2465-0

subject

Has Abstract

pub_date

2018-05-30 00:00:00

pages

83

issue

6

eissn

0959-3993

issn

1573-0972

pii

10.1007/s11274-018-2465-0

journal_volume

34

pub_type

杂志文章

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