Pathogenic bacteria attach to human fibronectin through a tandem beta-zipper

Nature. 2003 May 8;423(6936):177-81. doi: 10.1038/nature01589.

Abstract

Staphylococcus aureus and Streptococcus pyogenes, two important human pathogens, target host fibronectin (Fn) in their adhesion to and invasion of host cells. Fibronectin-binding proteins (FnBPs), anchored in the bacterial cell wall, have multiple Fn-binding repeats in an unfolded region of the protein. The bacterium-binding site in the amino-terminal domain (1-5F1) of Fn contains five sequential Fn type 1 (F1) modules. Here we show the structure of a streptococcal (S. dysgalactiae) FnBP peptide (B3) in complex with the module pair 1F12F1. This identifies 1F1- and 2F1-binding motifs in B3 that form additional antiparallel beta-strands on sequential F1 modules-the first example of a tandem beta-zipper. Sequence analyses of larger regions of FnBPs from S. pyogenes and S. aureus reveal a repeating pattern of F1-binding motifs that match the pattern of F1 modules in 1-5F1 of Fn. In the process of Fn-mediated invasion of host cells, therefore, the bacterial proteins seem to exploit the modular structure of Fn by forming extended tandem beta-zippers. This work is a vital step forward in explaining the full mechanism of the integrin-dependent FnBP-mediated invasion of host cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Motifs
  • Amino Acid Sequence
  • Bacterial Adhesion*
  • Binding Sites
  • Fibronectins / chemistry*
  • Fibronectins / metabolism*
  • Humans
  • Models, Molecular
  • Molecular Sequence Data
  • Nuclear Magnetic Resonance, Biomolecular
  • Protein Binding
  • Protein Structure, Secondary
  • Staphylococcus aureus / chemistry*
  • Staphylococcus aureus / metabolism*
  • Staphylococcus aureus / pathogenicity
  • Streptococcus pyogenes / chemistry*
  • Streptococcus pyogenes / metabolism*
  • Streptococcus pyogenes / pathogenicity

Substances

  • Fibronectins

Associated data

  • PDB/1O9A