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. 1983 Apr;154(1):104–112. doi: 10.1128/jb.154.1.104-112.1983

Glycerol and ethylene glycol: members of a new class of repellents of Escherichia coli chemotaxis.

K Oosawa, Y Imae
PMCID: PMC217436  PMID: 6339465

Abstract

By using the chemical-in-plug method, we found that glycerol and ethylene glycol caused negative chemotaxis in wild-type cells of Escherichia coli; the threshold concentration was about 10(-3) M for both chemicals. As with other known repellents, the addition of glycerol or ethylene glycol induced a brief tumble response in wild-type cells but not in generally nonchemotactic mutants. Experiments with mutants defective in various methyl-accepting chemotaxis proteins (MCPs) revealed that the presence of any one of three kinds of MCPs (MCP I, MCP II, or MCP III) was necessary to give a tumble response to these repellents. Consistently, it was found that the methylation-demethylation system of MCPs was involved in the adaptation of the cells to these repellents. The effect of glycerol or ethylene glycol was not enhanced by lowering the pH of the medium, and glycerol did not alter the membrane potential of the cells. All of these results suggest that glycerol and ethylene glycol are members of a new class of repellents which produce a tumble response in the cells by perturbing the MCPs in the membrane.

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Selected References

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