Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Quorum Quenching Bacteria Isolated from the Sludge of a Wastewater Treatment Plant and Their Application for Controlling Biofilm Formation

  • Kim, A-Leum (Department of Biomedicinal Science and Biotechnology, Paichai University) ;
  • Park, Son-Young (Department of Biomedicinal Science and Biotechnology, Paichai University) ;
  • Lee, Chi-Ho (Department of Biomedicinal Science and Biotechnology, Paichai University) ;
  • Lee, Chung-Hak (School of Chemical and Biological Engineering, Seoul National University) ;
  • Lee, Jung-Kee (Department of Biomedicinal Science and Biotechnology, Paichai University)
  • Received : 2014.07.07
  • Accepted : 2014.08.10
  • Published : 2014.11.28
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Abstract

Bacteria recognize changes in their population density by sensing the concentration of signal molecules, N-acyl-homoserine lactones (AHLs). AHL-mediated quorum sensing (QS) plays a key role in biofilm formation, so the interference of QS, referred to as quorum quenching (QQ), has received a great deal of attention. A QQ strategy can be applied to membrane bioreactors (MBRs) for advanced wastewater treatment to control biofouling. To isolate QQ bacteria that can inhibit biofilm formation, we isolated diverse AHL-degrading bacteria from a laboratory-scale MBR and sludge from real wastewater treatment plants. A total of 225 AHL-degrading bacteria were isolated from the sludge sample by enrichment culture. Afipia sp., Acinetobacter sp. and Streptococcus sp. strains produced the intracellular QQ enzyme, whereas Pseudomonas sp., Micrococcus sp. and Staphylococcus sp. produced the extracellular QQ enzyme. In case of Microbacterium sp. and Rhodococcus sp., AHL-degrading activities were detected in the whole-cell assay and Rhodococcus sp. showed AHL-degrading activity in cell-free lysate as well. There has been no report for AHL-degrading capability in the case of Streptococcus sp. and Afipia sp. strains. Finally, inhibition of biofilm formation by isolated QQ bacteria or enzymes was observed on glass slides and 96-well microtiter plates using crystal violet staining. QQ strains or enzymes not only inhibited initial biofilm development but also reduced established biofilms.

Keywords

References

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