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2014 | 61 | 1 |

Tytuł artykułu

Effect of nutrient and stress factors on polysaccharides synthesis in Proteus mirabilis biofilm

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The extracellular matrix in biofilm consists of water, proteins, polysaccharides, nucleic acids and phospholipids. Synthesis of these components is influenced by many factors, e.g. environment conditions or carbon source. The aim of the study was to analyse polysaccharides levels in Proteus mirabilis biofilms after exposure to stress and nutritional conditions. Biofilms of 22 P. mirabilis strains were cultivated for 24, 48, 72 hours, 1 and 2 weeks in tryptone soya broth or in modified media containing an additional amount of nutrients (glucose, albumin) or stress factors (cefotaxime, pH 4, nutrient depletion). Proteins and total polysaccharides levels were studied by Lowry and the phenol-sulphuric acid methods, respectively. Glycoproteins levels were calculated by ELLA with the use of selected lectins (WGA and HPA). For CLSM analysis dual fluorescent staining was applied with SYTO 13 and WGA-TRITC. In optimal conditions the levels of polysaccharides were from 0 to 442 μg/mg of protein and differed depending on the strains and cultivation time. The agents used in this study had a significant impact on the polysaccharides synthesis in the P. mirabilis biofilm. Among all studied components (depending on tested methods), glucose and cefotaxime stimulated the greatest production of polysaccharides by P. mirabilis strains (more than a twofold increase). For most tested strains the highest amounts of sugars were detected after one week of incubation. CLSM analysis confirmed the overproduction of N-acetyloglucosamine in biofilms after cultivation in nutrient and stress conditions, with the level 111-1134%, which varied depending on the P. mirabilis strain and the test factor.

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  • Department of Immunobiology of Bacteria, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
  • Department of Immunobiology of Bacteria, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
  • Department of Immunobiology of Bacteria, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
  • Department of Industrial Microbiology and Biotechnology, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
  • Department of Immunobiology of Bacteria, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland


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