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Assays for Studying the Role of Vitronectin in Bacterial Adhesion and Serum Resistance
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Goat vitronectin: characterization and binding to Staphylococcus aureus.

Manish Mahawar1, Paritosh Joshi

  • 1Division of Biochemistry, Indian Veterinary Research Institute, Izatnagar, India.

Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
|December 7, 2007
PubMed
Summary

Goat vitronectin (Vn) interacts with Staphylococcus aureus. A complete heparin-binding site at the C-terminus of Vn is essential for this bacterial binding, particularly when Vn is in its multimeric form.

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Area of Science:

  • Biochemistry
  • Microbiology
  • Veterinary Science

Background:

  • Vitronectin (Vn) is a key protein in plasma and extracellular matrix, known to bind various bacteria.
  • Staphylococcus aureus is a significant pathogen in animal husbandry, necessitating studies on its host interactions.

Purpose of the Study:

  • To characterize goat vitronectin (Vn).
  • To investigate the interaction between goat Vn and Staphylococcus aureus.
  • To identify the specific regions of goat Vn involved in S. aureus binding.

Main Methods:

  • Characterization of goat Vn, including identification of RGD motifs and multimerization sites using recombinant protein fragments.
  • Analysis of S. aureus binding to different goat Vn fragments (Vn1-200, Vn183-444, Vn323-444, Vn363-444).
  • Isolation of goat Vn using immunoaffinity chromatography to study binding with multimeric forms.

Main Results:

  • Goat Vn possesses two RGD motifs and two multimerization sites.
  • The N-terminal fragment (Vn1-200) supported S. aureus binding.
  • A complete heparin-binding site at the C-terminus of Vn was essential for S. aureus binding, with fragments lacking this site showing no binding.
  • Multimeric Vn, isolated by immunoaffinity chromatography, showed maximum S. aureus binding.

Conclusions:

  • The C-terminal heparin-binding site of goat vitronectin is crucial for Staphylococcus aureus adhesion.
  • Multimeric vitronectin, found in the extracellular matrix, likely plays a significant role in initial bacterial colonization in animals.
  • Understanding these interactions can inform strategies to control S. aureus infections in livestock.