Interactions between QnrB, QnrB Mutants, and DNA Gyrase
نویسندگان
چکیده
منابع مشابه
SOS regulation of qnrB expression.
In the sequence upstream from qnrB (but not qnrA or qnrS) is a LexA binding site. qnrB was shown to be under SOS control by demonstrating that quinolone susceptibility decreased with increasing temperature in a strain with a recA441(Ts) allele, whereas qnrB expression increased in response to ciprofloxacin or mitomycin C in strains with an intact lexA gene.
متن کاملFunctions of a GyrBA fusion protein and its interaction with QnrB and quinolones.
In order to study the interactions between Escherichia coli DNA gyrase and the gyrase interacting protein QnrB in vivo, we constructed a gyrB-gyrA fusion and validated its ability to correct the temperature-sensitive growth of gyrA and gyrB mutants. Like wild-type gyrA, the gyrB-gyrA fusion complemented a quinolone-resistant gyrA mutant to increase susceptibility. It functioned as an active typ...
متن کاملqnrB, another plasmid-mediated gene for quinolone resistance.
A novel plasmid-mediated quinolone resistance gene, qnrB, has been discovered in a plasmid encoding the CTX-M-15 beta-lactamase from a Klebsiella pneumoniae strain isolated in South India. It has less than 40% amino acid identity with the original qnr (now qnrA) gene or with the recently described qnrS but, like them, codes for a protein belonging to the pentapeptide repeat family. Strains with...
متن کاملCitrobacter spp. as a source of qnrB Alleles.
qnrB is the most common of the five qnr families and has the greatest number of allelic variants. Almost two-thirds of the qnrB alleles have been reported in Citrobacter spp., and several were shown to be located on the chromosome. In this study, PCR was used to investigate the prevalence of plasmid-mediated quinolone resistance genes in 71 clinical isolates belonging to the Citrobacter freundi...
متن کاملThe SOS response promotes qnrB quinolone-resistance determinant expression.
The qnr genes are plasmid-borne fluoroquinolone-resistance determinants widespread in Enterobacteriaceae. Three families of qnr determinants (qnrA, B and S) have been described, but little is known about their expression and regulation. Two new determinants, qnrC and qnrD, have been found recently. Here, we describe the characterization of the qnrB2 promoter and the identification of a LexA-bin...
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ژورنال
عنوان ژورنال: Antimicrobial Agents and Chemotherapy
سال: 2015
ISSN: 0066-4804,1098-6596
DOI: 10.1128/aac.00771-15