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Cholate-Stimulated Biofilm Formation by Lactococcus lactis Cells

Zaidi, A. H., Bakkes, P. J., Krom, B. P., van der Mei, H. C. & Driessen, A. J. M., Apr-2011, In : Applied and environmental microbiology. 77, 8, p. 2602-2610 9 p.

Research output: Contribution to journalArticleAcademicpeer-review

Bile acid resistance by Lactococcus lactis depends on the ABC-type multidrug transporter LmrCD. Upon deletion of the lmrCD genes, cells can reacquire bile acid resistance upon prolonged exposure to cholate, yielding the Delta lmrCD(r) strain. The resistance mechanism in this strain is non-transporter based. Instead, cells show a high tendency to flocculate, suggesting cell surface alterations. Contact angle measurements demonstrate that the Delta lmrCD(r) cells are equipped with an increased cell surface hydrophilicity compared to those of the parental and wild-type strains, while the surface hydrophilicity is reduced in the presence of cholate. Delta lmrCD(r) cells are poor in biofilm formation on a hydrophobic polystyrene surface, but in the presence of subinhibitory concentrations of cholate, biofilm formation is strongly stimulated. Biofilm cells show an enhanced extracellular polymeric substance production and are highly resistant to bile acids. These data suggest that non-transporter-based cholate resistance in L. lactis is due to alterations in the cell surface that stimulate cells to form resistant biofilms.

Original languageEnglish
Pages (from-to)2602-2610
Number of pages9
JournalApplied and environmental microbiology
Volume77
Issue number8
Publication statusPublished - Apr-2011

    Keywords

  • MULTIDRUG-RESISTANCE TRANSPORTER, PSEUDOMONAS-AERUGINOSA BIOFILMS, STAPHYLOCOCCUS-EPIDERMIDIS, ANTIMICROBIAL AGENTS, GENE-EXPRESSION, ACID BACTERIA, EFFLUX PUMPS, SURFACE, BIOSYNTHESIS, SUBSTANCES

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