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Staphylococcus aureus causing osteomyelitis binds to a nonapeptide sequence in bone sialoprotein
C Rydén1, H S Tung, V Nikolaev
1Department of Medical and Physiological Chemistry, University of Uppsala, BMC, Box 575, S-751 23 Uppsala, Sweden.
The Biochemical Journal
|May 15, 1998
Summary
Bone sialoprotein binds staphylococcal cells via its N-terminal region. Researchers pinpointed this interaction site to fewer than 10 amino acids, crucial for understanding bone infections.
Area of Science:
- Biochemistry
- Molecular Biology
- Biomaterials Science
Background:
- Bone sialoprotein (BSP) is a key glycoprotein in the bone and dentine extracellular matrix.
- BSP possesses polyanionic properties due to glutamic/aspartic acid residues, sialic acid, and tyrosine sulfate.
- Staphylococcal infections of bone tissue involve bacterial binding to BSP.
Purpose of the Study:
- To identify the specific binding site of staphylococcal cells on bone sialoprotein.
- To elucidate the molecular interactions between BSP and staphylococci.
Main Methods:
- Utilized recombinant deleted variants of bone sialoprotein.
- Employed synthetic peptides for precise localization.
- Investigated staphylococcal cell binding to BSP fragments.
Main Results:
- Previously identified the N-terminal 150 amino acids of BSP as responsible for staphylococcal binding.
- Further refined the binding site to a minimal sequence of less than 10 N-terminal residues.
- Demonstrated specific inhibition of binding using recombinant BSP core protein.
Conclusions:
- The staphylococcal binding site on bone sialoprotein is localized to a small N-terminal peptide region.
- This finding is critical for developing targeted therapies against bone infections caused by staphylococci.
- Understanding this interaction can inform strategies for preventing bacterial adhesion to bone implants.