Antiadhesive activity of the biosurfactant pseudofactin II secreted by the Arctic bacterium Pseudomonas fluorescens BD5

BMC Microbiology

Anna Krasowska¹  Marcin Łukaszewicz¹  Tomasz Janek² 

[1] Faculty of Chemistry, Wroclaw University of Technology, Gdańska 9/7, Wroclaw 50-344, Poland;Faculty of Biotechnology, University of Wroclaw, Przybyszewskiego 63/77, Wroclaw 51-148, Poland

关键词: Uropathogenic microorganisms;    Biofilm;    Adhesion;    Lipopeptide;    Biosurfactant;   

Others  :  1222025
DOI  :  10.1186/1471-2180-12-24

 received in 2011-09-16, accepted in 2012-02-23,  发布年份 2012

【 摘 要 】

Background

Pseudofactin II is a recently identified biosurfactant secreted by Pseudomonas fluorescens BD5, the strain obtained from freshwater from the Arctic Archipelago of Svalbard. Pseudofactin II is a novel compound identified as cyclic lipopeptide with a palmitic acid connected to the terminal amino group of eighth amino acid in peptide moiety. The C-terminal carboxylic group of the last amino acid forms a lactone with the hydroxyl of Thr3.

Adhesion is the first stage of biofilm formation and the best moment for the action of antiadhesive and anti-biofilm compounds. Adsorption of biosurfactants to a surface e.g. glass, polystyrene, silicone modifies its hydrophobicity, interfering with the microbial adhesion and desorption processes. In this study the role and applications of pseudofactin II as a antiadhesive compound has been investigated from medicinal and therapeutic perspectives.

Results

Pseudofactin II lowered the adhesion to three types of surfaces (glass, polystyrene and silicone) of bacterial strains of five species: Escherichia coli, Enterococcus faecalis, Enterococcus hirae, Staphylococcus epidermidis,Proteus mirabilis and two Candida albicans strains. Pretreatment of a polystyrene surface with 0.5 mg/ml pseudofactin II inhibited bacterial adhesion by 36-90% and that of C. albicans by 92-99%. The same concentration of pseudofactin II dislodged 26-70% of preexisting biofilms grown on previously untreated surfaces. Pseudofactin II also caused a marked inhibition of the initial adhesion of E. faecalis, E. coli, E. hirae and C. albicans strains to silicone urethral catheters. The highest concentration tested (0.5 mg/ml) caused a total growth inhibition of S. epidermidis, partial (18-37%) inhibition of other bacteria and 8-9% inhibition of C. albicans growth.

Conclusion

Pseudofactin II showed antiadhesive activity against several pathogenic microorganisms which are potential biofilm formers on catheters, implants and internal prostheses. Up to 99% prevention could be achieved by 0.5 mg/ml pseudofactin II. In addition, pseudofactin II dispersed preformed biofilms. Pseudofactin II can be used as a disinfectant or surface coating agent against microbial colonization of different surfaces, e.g. implants or urethral catheters.

【 授权许可】

   
2011 Janek et al; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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