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A von Willebrand factor-binding protein from Staphylococcus lugdunensis
Martin Nilsson1, Joakim Bjerketorp, Asa Wiebensjö
1Department of Microbiology, Swedish University of Agricultural Sciences, SE75007 Uppsala, Sweden.
FEMS Microbiology Letters
|April 28, 2004
Summary
Researchers identified a new Staphylococcus lugdunensis gene, vwbl, encoding a cell surface protein (vWbl) that binds to von Willebrand factor (vWf). This binding interaction is crucial for understanding bacterial adhesion and potential therapeutic targets.
Area of Science:
- Microbiology
- Molecular Biology
- Bacterial Pathogenesis
Background:
- Staphylococcus lugdunensis is a coagulase-negative staphylococci species known for its association with various infections.
- Von Willebrand factor (vWf) is a key protein in hemostasis and plays a role in bacterial adhesion to host tissues.
Purpose of the Study:
- To identify Staphylococcus lugdunensis surface proteins that interact with von Willebrand factor (vWf).
- To characterize the gene and protein responsible for vWf binding in S. lugdunensis.
Main Methods:
- Phage display library selection against purified von Willebrand factor.
- Gene identification, protein sequencing, and domain analysis.
- Southern blot analysis to determine gene prevalence.
Main Results:
- Identification of a novel gene, vwbl, encoding a 2060 amino acid cell surface protein, vWbl.
- vWbl possesses typical staphylococcal cell surface protein organization with repetitive vWf-binding domains.
- Antibodies against vWbl or vWf inhibited the binding interaction.
- The vwbl gene was detected in all 12 tested S. lugdunensis strains.
Conclusions:
- Staphylococcus lugdunensis expresses a cell surface protein, vWbl, that mediates binding to von Willebrand factor.
- This interaction is mediated by repetitive domains within vWbl and can be blocked by specific antibodies.
- The widespread presence of vwbl suggests its importance in S. lugdunensis biology and pathogenesis.