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Standardized In vitro Assays to Visualize and Quantify Interactions between Human Neutrophils and Staphylococcus aureus Biofilms
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Pfs promotes autolysis-dependent release of eDNA and biofilm formation in Staphylococcus aureus

Yan Bao1, Xu Zhang, Qiu Jiang

  • 1Department of Microbiology and Immunology, School of Life Sciences, University of Science and Technology of China, Hefei, 230027, Anhui, China.

Medical Microbiology and Immunology
|September 5, 2014
PubMed

Insights

The Pfs enzyme is crucial for Staphylococcus aureus biofilm formation by promoting cell lysis and extracellular DNA release. Targeting Pfs could be a novel strategy for anti-biofilm therapies against S. aureus infections.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Staphylococcus aureus is a significant pathogen known for forming biofilms, which complicates clinical treatments.
  • Biofilm formation is a key virulence factor for S. aureus, contributing to persistent and difficult-to-treat infections.
  • The enzyme Methylthioadenosine/S-adenosylhomocysteine nucleosidase (Pfs) is involved in various metabolic and signaling pathways.

Purpose of the Study:

  • To investigate the role of the Pfs enzyme in Staphylococcus aureus biofilm formation.
  • To elucidate the mechanisms by which Pfs influences biofilm development.
  • To evaluate Pfs as a potential therapeutic target for combating S. aureus biofilms.

Main Methods:

  • Gene deletion of pfs in S. aureus NCTC8325.
  • Assessment of bacterial clumping and biofilm formation under static and dynamic conditions.
  • Quantification of poly-N-acetylglucosamine (PIA) and extracellular DNA (eDNA) in biofilms.
  • Analysis of cell autolysis and transcription levels of autolysin genes (lytM, atlE).

Main Results:

  • Deletion of the pfs gene significantly reduced S. aureus clumping and biofilm formation.
  • The pfs mutation decreased extracellular DNA (eDNA) levels within biofilms.
  • Reduced cell autolysis and decreased transcription of autolysin genes (lytM, atlE) were observed in the pfs mutant.
  • Biofilm reduction occurred independently of the autoinducer-2 quorum-sensing pathway.

Conclusions:

  • Pfs plays a critical role in promoting Staphylococcus aureus biofilm formation through an autolysis-dependent mechanism involving eDNA release.
  • The Pfs enzyme is a potential novel therapeutic target for developing anti-biofilm strategies against S. aureus infections.

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