NDLI: Suppression of Hypersensitivity of Escherichia coli acrB Mutant to Organic Solvents by Integrational Activation of the acrEF Operon with the IS1 or IS2 Element

Content Provider	PubMed Central
Author	Kobayashi, Kei Tsukagoshi, Norihiko Aono, Rikizo
Copyright Year	2001
Abstract	The AcrAB-TolC efflux pump plays an intrinsic role in resistance to hydrophobic solvents in Escherichia coli. E. coli OST5500 is hypersensitive to solvents due to inactivation of the acrB gene by insertion of IS30. Suppressor mutants showing high solvent resistance were isolated from OST5500. These mutants produced high levels of AcrE and AcrF proteins, which were not produced in OST5500, and in each mutant an insertion sequence (IS1 or IS2) was found integrated upstream of the acrEF operon, coding for the two proteins. The suppressor mutants lost solvent resistance on inactivation of the acrEF operon. The solvent hypersensitivity of OST5500 was suppressed by introduction of the acrEF operon with IS1 or IS2 integrated upstream but not by introduction of the operon lacking the integrated IS. It was concluded that IS integration activated acrEF, resulting in functional complementation of the acrB mutation. The acrB mutation was also complemented by a plasmid containing acrF or acrEF under the control of Plac. The wild-type tolC gene was found to be essential for complementation of the acrB mutation by acrEF. Thus, it is concluded that in these cells a combination of the proteins AcrA, AcrF, and TolC or the proteins AcrE, AcrF, and TolC is functional in solvent efflux instead of the AcrAB-TolC efflux pump.
Related Links	http://dx.doi.org/10.1128/JB.183.8.2646-2653.2001
Starting Page	2646
File Format	PDF
ISSN	10985530
e-ISSN	10985530
Journal	Journal of Bacteriology
Issue Number	8
Volume Number	183
Language	English
Publisher	American Society for Microbiology
Publisher Date	2001-04-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Microbiology

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