Binding of Polycationic Antibiotics and Polyamines to Lipopolysaccharides of Pseudomonas Aeruginosa

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1985 Dec 1

PMID 2999076

Citations 56

Authors

A A Peterson

R E Hancock

E J McGroarty

Affiliations

Soon will be listed here.

Abstract

Polycations, such as aminoglycoside and peptide antibiotics, and naturally occurring polyamines were found to bind to the lipopolysaccharide of Pseudomonas aeruginosa and alter its packing arrangement. Binding of cations was measured by the displacement of a cationic spin probe from lipopolysaccharide into the aqueous environment upon addition of competitive cations. The level of probe displacement was dependent on the concentration and charge of the competing cation, with the more highly charged cations being more effective at displacing probe. The relative affinity of several antibiotics for lipopolysaccharide correlated with their ability to increase outer membrane permeability, while the relative affinity of several polyamines correlated with their ability to stabilize the outer membrane. Probe mobility within the lipopolysaccharide head group was shown to be decreased by cationic antibiotics and unaltered or increased by polyamines. We propose that antibiotic permeability and disruption of outer membrane integrity by polycationic antibiotics results from binding of the antibiotic to anionic groups on lipopolysaccharide with a consequent change in the conformation of lipopolysaccharide aggregate structure.

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