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Interactions of polymyxin B with lipopolysaccharide-containing membranes
Bacterial resistance to antibiotics constantly remodels the battlefront between infections and antibiotic therapy. Polymyxin B, a cationic peptide with an anti-Gram-negative spectrum of activity is re-entering use as a last resort measure and as an adjuvant. We use fluorescence dequenching to invest...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8704168/ https://www.ncbi.nlm.nih.gov/pubmed/34550139 http://dx.doi.org/10.1039/d1fd00036e |
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author | Goode, Alice Yeh, Vivien Bonev, Boyan B. |
author_facet | Goode, Alice Yeh, Vivien Bonev, Boyan B. |
author_sort | Goode, Alice |
collection | PubMed |
description | Bacterial resistance to antibiotics constantly remodels the battlefront between infections and antibiotic therapy. Polymyxin B, a cationic peptide with an anti-Gram-negative spectrum of activity is re-entering use as a last resort measure and as an adjuvant. We use fluorescence dequenching to investigate the role of the rough chemotype bacterial lipopolysaccharide from E. coli BL21 as a molecular facilitator of membrane disruption by LPS. The minimal polymyxin B/lipid ratio required for leakage onset increased from 5.9 × 10(−4) to 1.9 × 10(−7) in the presence of rLPS. We confirm polymyxin B activity against E. coli BL21 by the agar diffusion method and determined a MIC of 291 μg ml(−1). Changes in lipid membrane stability and dynamics in response to polymyxin and the role of LPS are investigated by (31)P NMR and high resolution (31)P MAS NMR relaxation is used to monitor selective molecular interactions between polymyxin B and rLPS within bilayer lipid membranes. We observe a strong facilitating effect from rLPS on the membrane lytic properties of polymyxin B and a specific, pyrophosphate-mediated process of molecular recognition of LPS by polymyxin B. |
format | Online Article Text |
id | pubmed-8704168 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-87041682022-01-14 Interactions of polymyxin B with lipopolysaccharide-containing membranes Goode, Alice Yeh, Vivien Bonev, Boyan B. Faraday Discuss Chemistry Bacterial resistance to antibiotics constantly remodels the battlefront between infections and antibiotic therapy. Polymyxin B, a cationic peptide with an anti-Gram-negative spectrum of activity is re-entering use as a last resort measure and as an adjuvant. We use fluorescence dequenching to investigate the role of the rough chemotype bacterial lipopolysaccharide from E. coli BL21 as a molecular facilitator of membrane disruption by LPS. The minimal polymyxin B/lipid ratio required for leakage onset increased from 5.9 × 10(−4) to 1.9 × 10(−7) in the presence of rLPS. We confirm polymyxin B activity against E. coli BL21 by the agar diffusion method and determined a MIC of 291 μg ml(−1). Changes in lipid membrane stability and dynamics in response to polymyxin and the role of LPS are investigated by (31)P NMR and high resolution (31)P MAS NMR relaxation is used to monitor selective molecular interactions between polymyxin B and rLPS within bilayer lipid membranes. We observe a strong facilitating effect from rLPS on the membrane lytic properties of polymyxin B and a specific, pyrophosphate-mediated process of molecular recognition of LPS by polymyxin B. The Royal Society of Chemistry 2021-07-26 /pmc/articles/PMC8704168/ /pubmed/34550139 http://dx.doi.org/10.1039/d1fd00036e Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Chemistry Goode, Alice Yeh, Vivien Bonev, Boyan B. Interactions of polymyxin B with lipopolysaccharide-containing membranes |
title | Interactions of polymyxin B with lipopolysaccharide-containing membranes |
title_full | Interactions of polymyxin B with lipopolysaccharide-containing membranes |
title_fullStr | Interactions of polymyxin B with lipopolysaccharide-containing membranes |
title_full_unstemmed | Interactions of polymyxin B with lipopolysaccharide-containing membranes |
title_short | Interactions of polymyxin B with lipopolysaccharide-containing membranes |
title_sort | interactions of polymyxin b with lipopolysaccharide-containing membranes |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8704168/ https://www.ncbi.nlm.nih.gov/pubmed/34550139 http://dx.doi.org/10.1039/d1fd00036e |
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