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. 1972 Oct;112(1):74–83. doi: 10.1128/jb.112.1.74-83.1972

Pleiotropic Properties and Genetic Organization of the tolA, B Locus of Escherichia coli K-12

Alan Bernstein a,1, Barry Rolfe a,2, Kazukiyo Onodera a,3
PMCID: PMC251382  PMID: 4627928

Abstract

Colicin-tolerant mutants of Escherichia coli K-12, which map near gal at 17 min (tolA, B mutants), have been isolated and characterized. These mutants exhibited a very broad spectrum of phenotypic changes consistent with the interpretation that they are cell surface mutants. In addition to being colicintolerant and sensitive to deoxycholate and ethylenediaminetetraacetic acid, tolA, B mutants are sensitive to vancomycin, bacitracin, and dodecyl sulfate. The tolA, B mutants from most strains also formed mucoid colonies at 30 C on nutrient agar plates and had a greatly increased plating efficiency for lysisdefective S mutants of bacteriophage λ. Complementation analysis showed that the four phenotypic groups of tol mutants that map near gal fall into three complementation groups: tolP, tolA, and tolB. Recombination analysis by three-factor crosses established the order of the three groups as tolP-tolA-tolB—gal. Because of the wide variety of phenotypic changes that accompanies mutation to colicin tolerance, revertants were isolated to test whether single or multiple mutations were involved. The reversion analysis, as well as other genetic criteria, confirmed that only single mutations were involved, suggesting that these pleiotropic changes are a consequence of a single change in the E. coli cell surface.

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Selected References

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