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Expression of extracellular polysaccharides and proteins by clinical isolates of Pseudomonas aeruginosa in response to environmental conditions

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Abstract

The opportunistic pathogen Pseudomonas aeruginosa causes chronic respiratory infections in patients with cystic fibrosis (CF). Persistence of this bacterium is attributed to its ability to form biofilms which rely on an extracellular polymeric substance matrix. Extracellular polysaccharides (EPS) and secreted proteins are key matrix components of P. aeruginosa biofilms. Recently, nebulized magnesium sulfate has been reported as a significant bronchodilator for asthmatic patients including CF. However, the impact of magnesium sulfate on the virulence effect of P. aeruginosa is lacking. In this report, we investigated the influence of magnesium sulfate and other environmental factors on the synthesis of alginate and secretion of proteins by a mucoid and a non-mucoid strain of P. aeruginosa, respectively. By applying the Plackett-Burman and Box-Behnken experimental designs, we found that phosphates (6.0 g/l), ammonium sulfate (4.0 g/l), and trace elements (0.6 mg/l) markedly supported alginate production by the mucoid strain. However, ferrous sulfate (0.3 mg/l), magnesium sulfate (0.02 g/l), and phosphates (6.0 g/l) reinforced the secretion of proteins by the non-mucoid strain.

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Authors and Affiliations

  1. Microbiology Department, Faculty of Dentistry, Pharos University in Alexandria, Alexandria, Egypt

    Walid A. Lotfy

  2. Department of Botany and Microbiology, Faculty of Science, Alexandria University, Alexandria, Egypt

    Ramy G. Atalla, Wael A. Sabra & Ehab R. El-Helow

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  1. Walid A. Lotfy
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  2. Ramy G. Atalla
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  3. Wael A. Sabra
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  4. Ehab R. El-Helow
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Correspondence to Walid A. Lotfy.

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Lotfy, W.A., Atalla, R.G., Sabra, W.A. et al. Expression of extracellular polysaccharides and proteins by clinical isolates of Pseudomonas aeruginosa in response to environmental conditions. Int Microbiol 21, 129–142 (2018). https://doi.org/10.1007/s10123-018-0010-5

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