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Area of Science:

  • Microbiology and Biomaterials Science
  • Investigating microbial adhesion mechanisms on synthetic surfaces

Background:

  • Biofilms on medical devices cause infections and device failure.
  • Staphylococcus epidermidis autolysin domains R2ab and amidase are implicated in initial bacterial attachment to polystyrene.
  • Structural basis of R2ab and amidase binding to surfaces remains unclear.

Purpose of the Study:

  • To investigate the influence of R2ab and amidase domains on biofilm formation on polystyrene.
  • To study the interaction of R2ab and amidase with polystyrene nanoparticles (PSNPs) using biophysical methods.
  • To understand the structural changes in R2ab and amidase upon binding to polystyrene surfaces.

Main Methods:

  • Biofilm inhibition assays on polystyrene plates pretreated with R2ab and amidase.
  • Interaction studies of R2ab and amidase with functionalized and non-functionalized PSNPs.
  • Circular dichroism (CD) spectroscopy and limited proteolysis to monitor protein structural changes.

Main Results:

  • R2ab and amidase pretreatment significantly inhibited biofilm growth on polystyrene.
  • Both domains exhibited strong interactions with neutral and anionic PSNPs.
  • PSNP interaction induced secondary structural changes in R2ab and amidase, with minor differences between neutral and anionic PSNPs.

Conclusions:

  • R2ab and amidase domains strongly adsorb to polystyrene surfaces, blocking bacterial attachment.
  • Surface adsorption destabilizes the secondary structure of these autolysin domains.
  • Aromatic residues likely mediate bacterial attachment to polystyrene, offering targets for anti-biofilm strategies.