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Specific binding of collagen to Staphylococcus aureus.
Collagen and Related Research
|June 1, 1985
Summary
Staphylococcus aureus binds to type I collagen, an extracellular matrix protein. This interaction, potentially crucial for bacterial adhesion to tissues, is not mediated by protein A or fibronectin.
Area of Science:
- Microbiology
- Biochemistry
- Extracellular Matrix Research
Background:
- Staphylococcus aureus is a common human pathogen.
- Bacterial adhesion to host tissues is a key step in infection.
- Extracellular matrix proteins are potential targets for bacterial adherence.
Purpose of the Study:
- To investigate the specific binding of soluble type I collagen to Staphylococcus aureus strains.
- To identify the bacterial components involved in collagen binding.
Main Methods:
- Binding assays using radiolabeled type I collagen and various Staphylococcus aureus strains.
- Saturation binding studies to quantify binding sites and affinity.
- Inhibition assays using gelatin, IgG, fibronectin, and protein A.
Main Results:
- Soluble type I collagen and procollagen bound to Staphylococcus aureus (Cowan I and ATCC 25923 strains).
- Binding was blocked by gelatin and inhibited by IgG in a dose-dependent manner.
- Protein A and fibronectin were not found to mediate collagen binding.
Conclusions:
- Staphylococcus aureus exhibits specific binding to type I collagen.
- The binding mechanism is distinct from protein A and fibronectin interactions.
- This interaction may represent a novel mechanism for Staphylococcus aureus tissue adherence.