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Mol Microbiol. 2016 Jan;99(1):123-34. doi: 10.1111/mmi.13219. Epub 2015 Oct 14.

Extracellular DNA facilitates the formation of functional amyloids in Staphylococcus aureus biofilms.

Author information

1
Department of Molecular Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, USA.
2
Department of Chemical Engineering, University of Michigan, Ann Arbor, MI, USA.
3
Department of Microbiology, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA, USA.

Abstract

Persistent staphylococcal infections often involve surface-associated communities called biofilms. Staphylococcus aureus biofilm development is mediated by the co-ordinated production of the biofilm matrix, which can be composed of polysaccharides, extracellular DNA (eDNA) and proteins including amyloid fibers. The nature of the interactions between matrix components, and how these interactions contribute to the formation of matrix, remain unclear. Here we show that the presence of eDNA in S. aureus biofilms promotes the formation of amyloid fibers. Conditions or mutants that do not generate eDNA result in lack of amyloids during biofilm growth despite the amyloidogeneic subunits, phenol soluble modulin peptides, being produced. In vitro studies revealed that the presence of DNA promotes amyloid formation by PSM peptides. Thus, this work exposes a previously unacknowledged interaction between biofilm matrix components that furthers our understanding of functional amyloid formation and S. aureus biofilm biology.

PMID:
26365835
PMCID:
PMC4715698
DOI:
10.1111/mmi.13219
[Indexed for MEDLINE]
Free PMC Article

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