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. 1975 Jul;8(1):95–104. doi: 10.1128/aac.8.1.95

Action of Polymyxin B on Bacterial Membranes: Morphological Changes in the Cytoplasm and in the Outer Membrane of Salmonella typhimurium and Escherichia coli B

Peter R G Schindler 1, Michael Teuber 1
PMCID: PMC429267  PMID: 169730

Abstract

Though the primary action of the cationic antibiotic polymyxin B is against the membrane of susceptible bacteria, severe morphological changes are detected in the cytoplasm. Using fluorescence microscopy and a mono-N-dansyl-polymyxin B derivative, we could demonstrate aggregations of the antibiotic with cellular material, possibly nucleic acids and/or ribosomes. These aggregations were only produced by minimum inhibitory or higher concentrations of the antibiotic as shown with Salmonella and Escherichia strains differing in their polymyxin susceptibility. The outer membrane of Salmonella typhimurium revealed characteristic blebs when treated with polymyxin B. This was investigated by the gentle methods of spray-freezing and freeze-etching. The obtained electron micrographs suggest that the polymyxin-induced blebs are projections of the outer monolayer of the outer membrane. A possible mechanism of penetration of polymyxin B through the cell envelope of gram-negative bacteria is presented.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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