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Int. J. Mol. Sci. 2018, 19(6), 1685; https://doi.org/10.3390/ijms19061685

Influence of Bacterial Biofilm Polysaccharide Structure on Interactions with Antimicrobial Peptides: A Study on Klebsiella pneumoniae

Department of Life Sciences, University of Trieste, Via Licio Giorgieri 1, 34127 Trieste, Italy
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Received: 28 March 2018 / Revised: 18 May 2018 / Accepted: 1 June 2018 / Published: 6 June 2018
(This article belongs to the Section Biochemistry)
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Abstract

Biofilms are complex systems produced by bacteria and constituted by macromolecular matrix embedding cells. They provide advantages to bacteria including protection against antimicrobials. The protection given by biofilms produced by Klebsiella pneumoniae strains towards antimicrobial peptides of the innate immune system was investigated. In particular, the role of matrix bacterial exopolysaccharides was explored. Three clinical strains producing exopolysaccharides with different chemistry were selected and the interaction of purified biofilm polysaccharides with two bovine cathelicidins was studied by circular dichroism spectroscopy and microbiological assays to establish their influence on the peptide’s antimicrobial activity. The spectroscopic data indicated a different extent of interaction with the two peptides, in a manner dependent on their sugar composition, and in particular the presence of rhamnose residues correlated with a lower interaction. The extent of interaction was then related to the protection towards antimicrobial peptides, conferred by the addition of the different exopolysaccharides, in minimum inhibitory concentration (MIC) assays against a reference Escherichia coli strain. Microbiological results were in very good agreement with spectroscopic data, confirming the active role of matrix polysaccharides in determining a biofilm’s protective capacity and indicating lower protection levels afforded by rhamnose containing exopolysaccharides. View Full-Text
Keywords: bacterial biofilm; matrix exopolysaccharides; antimicrobial peptides; bacterial protection; exopolysaccharides biological activity bacterial biofilm; matrix exopolysaccharides; antimicrobial peptides; bacterial protection; exopolysaccharides biological activity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bellich, B.; Lagatolla, C.; Tossi, A.; Benincasa, M.; Cescutti, P.; Rizzo, R. Influence of Bacterial Biofilm Polysaccharide Structure on Interactions with Antimicrobial Peptides: A Study on Klebsiella pneumoniae. Int. J. Mol. Sci. 2018, 19, 1685.

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