Document Detail

Interspecies communication in Streptococcus gordonii-Veillonella atypica biofilms: signaling in flow conditions requires juxtaposition.
MedLine Citation:
PMID:  15546975     Owner:  NLM     Status:  MEDLINE    
During the development of human oral biofilm communities, the spatial arrangement of the bacteria is thought to be driven by metabolic interactions between them. Streptococcus gordonii and Veillonella atypica, two early colonizing members of the dental plaque biofilm, have been postulated to participate in metabolic communication; S. gordonii ferments carbohydrates to form lactic acid, which is a preferred fermentation substrate for V. atypica. We found that, during agar-plate coculture of these organisms, a signaling event occurs that results in increased expression of the S. gordonii alpha-amylase-encoding gene amyB. Confocal scanning laser microscopy of coculture flowcell-grown biofilms using human saliva as the sole nutrient showed that V. atypica caused S. gordonii to increase expression of a PamyB-'gfp transcriptional fusion in a spatially resolved fashion. In this open system, only those streptococci in mixed-species microcolonies containing V. atypica expressed GFP; nearby S. gordonii colonies that lacked V. atypica did not express GFP. In a closed system containing S. gordonii and V. atypica, flow cytometric analysis showed that S. gordonii containing the PamyB-'gfp reporter plasmid exhibited mean fluorescence levels 20-fold higher than did S. gordonii that had not been incubated with V. atypica. Thus, in a closed system where a diffusible signal can accumulate above a required threshold, interspecies signaling mediates a change in gene expression. We provide evidence that, in open systems like those that predominate in natural biofilms, diffusible signals between species are designed to function over short distances, on the order of 1 mum.
Paul G Egland; Robert J Palmer; Paul E Kolenbrander
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Publication Detail:
Type:  Journal Article     Date:  2004-11-16
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  101     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-12-01     Completed Date:  2005-01-11     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  16917-22     Citation Subset:  IM    
Oral Infection and Immunity Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892, USA.
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MeSH Terms
Base Sequence
DNA Primers
Signal Transduction*
Species Specificity
Streptococcus / growth & development,  physiology*
Veillonella / growth & development,  physiology*
Reg. No./Substance:
0/DNA Primers

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