| Literature DB >> 12057966 |
Robert B Helling1, Brian K Janes, Heather Kimball, Timothy Tran, Michael Bundesmann, Pietra Check, Darcy Phelan, Charles Miller.
Abstract
About 10% of the nalidixic acid-resistant (Nal(r)) mutants in a transposition-induced library exhibited a growth factor requirement as the result of cysH, icdA, metE, or purB mutation. Resistance in all of these mutants required a functional AcrAB-TolC efflux pump, but the EmrAB-TolC pump played no obvious role. Transcription of acrAB was increased in each type of Nal(r) mutant. In the icdA and purB mutants, each of the known signaling pathways appeared to be used in activating the AcrAB-TolC pump. The metabolites that accumulate upstream of the blocks caused by the mutations are hypothesized to increase the levels of the AcrAB-TolC pump, thereby removing nalidixic acid from the organism.Entities:
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Year: 2002 PMID: 12057966 PMCID: PMC135154 DOI: 10.1128/JB.184.13.3699-3703.2002
Source DB: PubMed Journal: J Bacteriol ISSN: 0021-9193 Impact factor: 3.490