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. 1973 Mar;3(3):399–406. doi: 10.1128/aac.3.3.399

Susceptibility of Whole Cells and Spheroplasts of Pseudomonas aeruginosa to Actinomycin D

K-J Cheng 1,2,3, J W Costerton 1,2,3, A P Singh 1,2,3, J M Ingram 1,2,3, E S Idziak 1,2,3
PMCID: PMC444422  PMID: 4208288

Abstract

Cells of Pseudomonas aeruginosa suspended in 0.2 M Mg2+, 20% sucrose, 0.01 M tris(hydroxymethyl)aminomethane, or water partially release lipopolysaccharide. The release of alkaline phosphatase from the periplasmic space and the ability to form spheroplasts on lysozyme treatment is directly related to the lipopolysaccharide released during treatment with 0.2 M Mg2+, 20% sucrose, or other agents. The synthesis of ribonucleic acid (RNA) by intact cells, magnesium-lysozyme spheroplasts, or 20% sucrose-lysozyme spheroplasts is not sensitive to actinomycin D, whereas RNA synthesis by intact cells or spheroplasts in the presence of ethylene-diaminetetraacetic acid (EDTA) is sensitive to actinomycin D. EDTA alone has an inhibitory effect on RNA synthesis by whole cell, by magnesium-lysozyme spheroplasts, and by 20% sucrose-lysozyme spheroplasts. The experimental data indicate that, although the cell wall is damaged by 0.2 M Mg2+ or 20% sucrose treatment in the presence of lysozyme, the treated cells or spheroplasts are still resistant to actinomycin D. These results suggest that the cytoplasmic membrane should be considered as the final and determinative barrier to this antibiotic in this organism.

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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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