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The cell-envelope proteome of Bifidobacterium longum in an in vitro bile environment

Ruiz, Lorena
Sanchez, Borja
de los Reyes-Gavilan, C. G.
Margolles, A.
Published in Microbiology. 2009, vol. 155, no. Pt 3, p. 957-967
Abstract Host-bacteria interactions are often mediated via surface-associated proteins. The identification of these proteins is an important goal of bacterial proteomics. To address how bile can influence the cell-envelope proteome of Bifidobacterium longum biotype longum NCIMB 8809, we analysed its membrane protein fraction using stable isotope labelling of amino acids in cell culture (SILAC). We were able to identify 141 proteins in the membrane fraction, including a large percentage of the theoretical transporters of this species. Moreover, the envelope-associated soluble fraction was analysed using different subfractionation techniques and differential in-gel fluorescence electrophoresis (DIGE). This approach identified 128 different proteins. Some of them were well-known cell wall proteins, but others were highly conserved cytoplasmic proteins probably displaying a 'moonlighting' function. We were able to identify 11 proteins in the membrane fraction and 6 proteins in the envelope-associated soluble fraction whose concentration varied in the presence of bile. Bile promoted changes in the levels of proteins with important biological functions, such as some ribosomal proteins and enolase. Also, oligopeptide-binding proteins were accumulated on the cell surface, which was reflected in a different tripeptide transport rate in the cells grown with bile. The data reported here will provide the first cell-envelope proteome map for B. longum, and may contribute to understanding the bile tolerance of these bacteria.
Keywords Bacterial Proteins/genetics/isolation & purification/*metabolismBifidobacterium/genetics/*metabolismBile/*chemistryCell Membrane/genetics/*metabolismComputational BiologyCulture MediaGene Expression Regulation, BacterialIsotope LabelingProteome/genetics/*metabolismProteomics
PMID: 19246766
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Research group Groupe de Protéomique biomédicale (635)
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RUIZ, Lorena et al. The cell-envelope proteome of Bifidobacterium longum in an in vitro bile environment. In: Microbiology, 2009, vol. 155, n° Pt 3, p. 957-967. doi: 10.1099/mic.0.024273-0 https://archive-ouverte.unige.ch/unige:20068

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Deposited on : 2012-04-23

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