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Related Experiment Videos

Fibronectin binding to protein A-containing staphylococci

J E Doran, R H Raynor

    Infection and Immunity
    |September 1, 1981
    PubMed
    Summary

    Fibronectin binds to Staphylococcus aureus via protein A, a key factor in bacterial infection. This interaction may promote bacterial attachment and invasion into host tissues.

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    Area of Science:

    • Microbiology
    • Immunology
    • Biochemistry

    Background:

    • Staphylococcus aureus is a significant human pathogen.
    • Protein A is a surface protein found on S. aureus.
    • Fibronectin is a crucial component of the extracellular matrix involved in cell adhesion and tissue repair.

    Purpose of the Study:

    • To investigate the binding interaction between fibronectin and Staphylococcus aureus.
    • To determine the role of protein A in fibronectin binding to S. aureus.
    • To explore the potential implications of this interaction in S. aureus pathogenicity.

    Main Methods:

    • Purification of fibronectin from human plasma using affinity chromatography.
    • Radiolabeling of purified fibronectin with 125I.
    • Binding assays using various S. aureus strains, including protein A-positive and mutant strains, and S. epidermidis.
    • Assessment of fibronectin binding correlation with cellular protein A content.
    • Evaluation of the effect of pre-culture conditions on protein A expression and fibronectin binding.
    • Inhibition assays using soluble protein A.

    Main Results:

    • Fibronectin specifically binds to protein A-containing isolates of Staphylococcus aureus.
    • Fibronectin binding is directly correlated with the cellular protein A content.
    • Pre-culture in mannitol salt broth reduces cellular protein A and decreases fibronectin binding.
    • Soluble protein A inhibits fibronectin binding by a maximum of 50%, suggesting additional binding sites.

    Conclusions:

    • Protein A on Staphylococcus aureus mediates fibronectin binding.
    • Fibronectin-protein A interaction may contribute to S. aureus adherence and invasion of host tissues.
    • The binding mechanism may involve multiple fibronectin-binding sites on S. aureus.

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