First report of mefA and msrA/msrB multidrug efflux pumps associated with blaTEM-1 β-lactamase in Enterococcus faecalis
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چکیده
منابع مشابه
EfrAB, an ABC multidrug efflux pump in Enterococcus faecalis.
A DNA fragment responsible for resistance to antimicrobial agents was cloned from the chromosomal DNA of Enterococcus faecalis ATCC 29212 by using drug-hypersensitive mutant Escherichia coli KAM32 as a host cell. Cells of E. coli KAM32 harboring a recombinant plasmid (pAEF82) carrying the DNA fragment became resistant to many structurally unrelated antimicrobial agents, such as norfloxacin, cip...
متن کاملMultidrug Efflux Pumps of E. coli 215 AcrAB and Related Multidrug Efflux Pumps of Escherichia coli
The AcrAB system of Escherichia coli is a multidrug efflux system composed of an RND-type transporter AcrB and a periplasmic accessory protein AcrA, and pumps out a wide variety of lipophilic and amphiphilic inhibitors directly into the medium, presumably through the TolC outer membrane channel. AcrA, a highly elongated protein, is thought to bring the outer and inner membranes closer. It forms...
متن کاملCharacterization of emeA, a NorA homolog and multidrug resistance efflux pump, in Enterococcus faecalis.
We hypothesized that multidrug resistance efflux pumps (MDRs) may be contributing to the drug resistance of enterococci. We recently identified potential MDR-encoding genes in the Enterococcus faecalis V583 genome. Among the putative MDRs, we found a gene that encodes a NorA homolog and have characterized this enterococcal MDR in the present study. A mutant from which the enterococcal NorA homo...
متن کاملMultidrug efflux pumps of gram-negative bacteria.
Gram-negative bacteria tend to be more resistant to lipophilic and amphiphilic inhibitors than gram-positive bacteria. Such inhibitors include dyes, detergents, free fatty acids, antibiotics, and other chemotherapeutic agents. This property is used in the selective enrichment of gram-negative bacteria, especially of members of the family Enterobacteriaceae, for example with MacConkey agar (cont...
متن کاملTripartite assembly of RND multidrug efflux pumps
Tripartite multidrug efflux systems of Gram-negative bacteria are composed of an inner membrane transporter, an outer membrane channel and a periplasmic adaptor protein. They are assumed to form ducts inside the periplasm facilitating drug exit across the outer membrane. Here we present the reconstitution of native Pseudomonas aeruginosa MexAB-OprM and Escherichia coli AcrAB-TolC tripartite Res...
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ژورنال
عنوان ژورنال: International Journal of Infectious Diseases
سال: 2012
ISSN: 1201-9712
DOI: 10.1016/j.ijid.2011.09.024