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Multiple interactions between human vitronectin and Staphylococcus aureus

O D Liang1, M Maccarana, J I Flock

  • 1Department of Medical Microbiology, University of Lund, Sweden.

Biochimica Et Biophysica Acta
|November 25, 1993
PubMed
Summary
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Staphylococcus aureus binds human vitronectin through high and moderate affinity interactions. This bacterial colonization may be influenced by vitronectin binding to bacterial surface proteins and heparin oligosaccharides.

Area of Science:

  • Microbiology
  • Biochemistry
  • Molecular Biology

Background:

  • Vitronectin is a key component of the extracellular matrix, involved in cell adhesion and migration.
  • Staphylococcus aureus is a common human pathogen that can colonize various tissues.

Purpose of the Study:

  • To investigate the molecular interactions between human vitronectin and Staphylococcus aureus.
  • To characterize the binding kinetics and identify potential binding sites and molecules involved in this interaction.

Main Methods:

  • Scatchard analysis was employed to quantify binding affinity and site numbers.
  • Experiments involving ionic strength and heparin oligosaccharides were conducted to probe interaction mechanisms.
  • Identification of a putative vitronectin-binding protein using molecular mass determination.

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Main Results:

  • Observed dual-affinity binding of vitronectin to S. aureus, with high affinity (Kd1 = 7.4 x 10(-10) M) and moderate affinity (Kd2 = 7.4 x 10(-8) M).
  • Binding exhibited negative cooperativity (Hill coefficient < 1), with distinct populations of binding sites (260 and 5240 per cell).
  • A significant portion of the interaction was independent of ionic strength and heparin, but modulated by heparin oligosaccharide length, suggesting direct saccharide-vitronectin association. A 60 kDa protein was identified as a potential high-affinity binding molecule.

Conclusions:

  • The interaction between multimeric vitronectin and S. aureus involves multiple recognition sites on the bacterial surface.
  • This binding interaction, potentially mediated by a 60 kDa protein and influenced by oligosaccharide structure, may play a role in bacterial colonization.
  • Further research into these molecular interactions can inform strategies to combat S. aureus infections.