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Microbiology 155 (2009), 1708-1716; DOI  10.1099/mic.0.025288-0
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Microbiology 155 (2009), 1708-1716; DOI  10.1099/mic.0.025288-0
© 2009 Society for General Microbiology

Identification of surface proteins involved in the adhesion of a probiotic Bacillus cereus strain to mucin and fibronectin

B. Sánchez1,{dagger}, S. Arias1,{dagger}, S. Chaignepain2, M. Denayrolles1, J. M. Schmitter2, P. Bressollier1,3 and M. C. Urdaci1

1 UMR 5248 CBMN CNRS-Université Bordeaux 1-ENITAB, Laboratoire de Microbiologie et Biochimie Appliquée, 1 cours du Général de Gaulle, 33175 Gradignan Cedex, France
2 UMR 5248 CBMN CNRS-Université Bordeaux 1-ENITAB, Institut Européen de Chimie et Biologie, B8 avenue des facultés, F-33402 Talence Cedex, France
3 Laboratoire de Chimie des Substances Naturelles, EA 1069, FST, 123 Av. A. Thomas, 87060 Limoges, France

Several Bacillus strains isolated from commercial probiotic preparations were identified at the species level, and their adhesion capabilities to three different model intestinal surfaces (mucin, Matrigel and Caco-2 cells) were assessed. In general, adhesion of spores was higher than that of vegetative cells to the three matrices, and overall strain Bacillus cereusCH displayed the best adhesion. Different biochemical treatments revealed that surface proteins of B. cereusCH were involved in the adhesion properties of the strain. Surface-associated proteins from vegetative cells and spores of B. cereusCH were extracted and identified, and some proteins such as S-layer components, flagellin and cell-bound proteases were found to bind to mucin or fibronectin. These facts suggest that those proteins might play important roles in the interaction of this probiotic Bacillus strain within the human gastrointestinal tract.

Correspondence
M. Urdaci
m-urdaci{at}enitab.fr

Abbreviations: GIT, gastrointestinal tract

{dagger}These authors contributed equally to this work.






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