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J Bacteriol. 1968 October; 96(4): 987-996
Copyright © 1968 American Society for Microbiology. All Rights Reserved.

Genetic Determination of Resistance to Acriflavine, Phenethyl Alcohol, and Sodium Dodecyl Sulfate in Escherichia coli

^a Biological Institute, Faculty of Science, Konan University, Kobe, Japan

ABSTRACT

Wild-type strains of Escherichia coli K-12 are resistant to acriflavine. Gene acrA⁺ which determines resistance to acriflavine is located near the lac region of the chromosome. This gene determines not only resistance to basic dyes but also resistance to phenethyl alcohol. Acriflavine resistance was transmitted, together with phenethyl alcohol resistance, from a resistant Hfr strain to a sensitive recipient by mating. Reversion of the mutant gene acrA1 (phenotypically acriflavine-sensitive) to acriflavine resistance was accompanied by a change from phenethyl alcohol sensitivity to resistance, and conversely the revertants selected for phenethyl alcohol resistance were resistant to acriflavine. A suppressor mutation, sup-100, closely linked to the acr locus, suppresses the acrA1 gene (phenotypically acriflavine-resistant), but does not determine resistance to phenethyl alcohol and basic dyes other than acriflavine. The genetic change in the locus acrA1 to types resistant to basic dyes and phenethyl alcohol was accompanied by an increase in resistance to sodium dodecyl sulfate, a potent solvent of lipopolysaccharide and lipoprotein. It is suggested that gene acrA determines synthesis of a membrane substance. The system seemed to be affected strongly by the presence of inorganic phosphate.

¹ Present address: Palo Alto Research Foundation, Palo Alto, Calif.

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