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Binding of elastin to Staphylococcus aureus.

P W Park1, D D Roberts, L E Grosso

  • 1Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri 63110.

The Journal of Biological Chemistry
|December 5, 1991
PubMed
Summary
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Staphylococcus aureus specifically binds to elastin, a key component of elastic tissue. This interaction involves a high-affinity protein receptor on the bacteria, distinct from mammalian elastin receptors.

Area of Science:

  • Microbiology
  • Biochemistry
  • Extracellular Matrix Biology

Background:

  • Pathogenic bacteria often target extracellular matrix components for adhesion.
  • Elastin is a crucial structural protein in elastic tissues, influencing tissue mechanics and integrity.

Purpose of the Study:

  • To investigate the specific binding of Staphylococcus aureus to elastin.
  • To characterize the nature and affinity of this interaction and identify the bacterial binding domain on elastin.

Main Methods:

  • Radiolabeled tropoelastin competition assays to determine binding specificity.
  • Kinetic and Scatchard analyses to quantify binding affinity and site number.
  • Affinity chromatography using elastin peptides to isolate the bacterial binding protein.

Related Experiment Videos

  • Limited proteolysis and truncated tropoelastin fragments to map the binding domain.

    • Main Results:

    • Staphylococcus aureus demonstrated specific, high-affinity binding to elastin (KD ~4-7 nM).
    • Approximately 1000 binding sites were identified per bacterium.
    • A 25-kDa elastin-binding protein was isolated from S. aureus.
    • The bacterial binding site on elastin was mapped to a 30-kDa amino-terminal fragment, distinct from mammalian receptor binding sites.

    Conclusions:

    • Staphylococcus aureus possesses a specific protein receptor for elastin, mediating bacterial adhesion to elastic tissues.
    • This elastin-binding mechanism is unique and differs from host elastin receptor interactions.
    • Understanding this interaction may offer novel therapeutic targets for S. aureus infections.