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. 1981 Nov;148(2):399–405. doi: 10.1128/jb.148.2.399-405.1981

Use of lipophilic cation-permeable mutants for measurement of transmembrane electrical potential in metabolizing cells of Escherichia coli.

N Hirota, S Matsuura, N Mochizuki, N Mutoh, Y Imae
PMCID: PMC216219  PMID: 6795176

Abstract

Some lipopolysaccharide-defective mutants of Escherichia coli showed, without ethylenediaminetetraacetic acid treatment, a quick and high uptake of lipophilic cations such as triphenylmethylphosphonium and tetraphenylphosphonium. The rate and amount of uptake were comparable to those of an ethylenediaminetetraacetic acid-treated wild type. Transmembrane electrical potential, which was calculated from the distribution of these lipophilic cations between the inside and outside of the mutant cells, was about -150 mV at pH 7.5 and showed a strong dependency on the external pH. One of the E. coli mutants, the acrA mutant, was found to be also permeable to dicyclohexylcarbodiimide, an H+-adenosine triphosphatase inhibitor, and 1-anilino-8-naphthalene sulfonate, a fluorescent dye. The acrA mutant was vigorously motile and highly sensitive to many bacteriophages and colicins. Thus, the acrA mutant is quite useful for the quantitative measurement of transmembrane electrical potential by lipophilic cations in intact and metabolizing cells especially in relation to motility and actions of colicins and bacteriophages.

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Selected References

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