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Invasion of Human Cells by a Bacterial Pathogen
07:15

Invasion of Human Cells by a Bacterial Pathogen

Published on: March 21, 2011

Binding of a peptide from a Streptococcus dysgalactiae MSCRAMM to the N-terminal F1 module pair of human fibronectin

U Schwarz-Linek1, M J Plevin, A R Pickford

  • 1Department of Biochemistry, University of Oxford, South Parks Road, UK.

FEBS Letters
|May 30, 2001
PubMed

Insights

This study reveals how a synthetic peptide from Streptococcus dysgalactiae binds to human fibronectin. The findings illuminate bacterial adhesion mechanisms, crucial for understanding host-pathogen interactions.

Area of Science:

  • Microbiology
  • Biochemistry
  • Structural Biology

Background:

  • Pathogenic bacteria like staphylococci and streptococci adhere to host fibronectin, an extracellular matrix protein, for invasion.
  • Microbial Surface Components Recognizing Adhesive Matrix Molecules (MSCRAMMs) mediate this bacterial adherence and are often virulence factors.

Purpose of the Study:

  • To characterize the interaction between a synthetic peptide (B3) from Streptococcus dysgalactiae and the N-terminal module pair (1F12F1) of human fibronectin.
  • To elucidate the binding sites and mechanisms involved in this host-pathogen interaction.

Main Methods:

  • Nuclear magnetic resonance (NMR) spectroscopy was employed to analyze the complex formation.
  • Chemical shift changes in the 1F12F1 modules upon peptide binding were monitored.

Main Results:

  • NMR data demonstrated that both modules within the 1F12F1 pair bind to the B3 peptide.
  • A conserved region on each module was identified as the primary interaction site for the peptide.
  • This binding site is analogous to the previously identified binding site for a Staphylococcus aureus peptide on the 4F15F1 fibronectin module pair.

Conclusions:

  • The study provides structural insights into the binding of Streptococcus dysgalactiae adhesin-derived peptide B3 to human fibronectin.
  • The findings highlight conserved mechanisms of bacterial fibronectin binding across different pathogenic species.
  • Understanding these interactions is vital for developing strategies to combat bacterial infections.

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