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. 1985 Apr;27(4):548–554. doi: 10.1128/aac.27.4.548

Binding of polymyxin B nonapeptide to gram-negative bacteria.

M Vaara, P Viljanen
PMCID: PMC180093  PMID: 2988430

Abstract

The binding of the outer membrane-disorganizing peptide polymyxin B nonapeptide (PMBN) to gram-negative bacteria was studied by using tritium-labeled PMBN. Smooth Salmonella typhimurium had a binding capacity of ca. 6 nmol of PMBN per mg (dry weight) of bacteria, which corresponds to ca. 1 X 10(6) to 2 X 10(6) molecules of PMBN per single cell. The binding was of relatively high affinity (Kd, 1.3 microM). The isolated outer membrane of S. typhimurium bound ca. 100 nmol of PMBN per mg of outer membrane protein (Kd, 1.1 microM), whereas the cytoplasmic membrane bound 9 to 10 times less. Other bacteria which are susceptible to the action of PMBN (Escherichia coli strains, Pseudomonas aeruginosa, Haemophilus influenzae) also bound large amounts of PMBN. The S. typhimurium pmrA mutant, Neisseria gonorrhoeae, and Proteus mirabilis (all known as resistant to polymyxin and PMBN) bound 3.3, 4, and 12 times less than S. typhimurium, respectively. The binding of PMBN to S. typhimurium was effectively inhibited by low concentrations of polymyxin B, compound EM49 (octapeptin), polylysine, and protamine. Spermine, Ca2+, and Mg2+ also inhibited the PMBN binding although they were ca. 160, 700, and 2,400 times less active (based on molarity) than polymyxin B, respectively. No binding inhibition was found at the tested concentrations of streptomycin, tetralysine, spermidine, or cadaverine.

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Selected References

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