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Delineation of Borrelia burgdorferi p66 sequences required for integrin alpha(IIb)beta(3) recognition
1Division of Rheumatology and Immunology, Tufts-New England Medical Center, Boston, Massachusetts 02111, USA.
Abstract:
The outer membrane protein p66 of the Lyme disease agent, Borrelia burgdorferi, has been identified as a candidate ligand for beta(3)-chain integrins. To identify portions of p66 required for integrin recognition, fusions of maltose-binding protein to fragments of p66 were tested for binding to integrin alpha(IIb)beta(3), and synthetic peptides derived from the p66 amino acid sequence were tested for the ability to inhibit B. burgdorferi attachment to the same integrin. The data identify two noncontiguous segments of p66 that are important for alpha(IIb)beta(3) recognition, suggesting that, as is true for other integrin ligands, the tertiary structure of p66 is important for receptor recognition.
Insights
The outer membrane protein p66 from Borrelia burgdorferi, the Lyme disease agent, binds to beta(3)-chain integrins. Specific segments of p66 are crucial for this integrin recognition, indicating the importance of its structure.
Area of Science:
- Microbiology
- Molecular Biology
- Immunology
Background:
- The outer membrane protein p66 of Borrelia burgdorferi, the causative agent of Lyme disease, is implicated as a ligand for beta(3)-chain integrins.
- Integrins are crucial cell surface receptors involved in cell adhesion and signaling.
Purpose of the Study:
- To pinpoint the specific regions of the p66 protein essential for its recognition by integrin alpha(IIb)beta(3).
- To understand the structural basis of the interaction between Borrelia burgdorferi and host integrins.
Main Methods:
- Utilized maltose-binding protein fusions with Borrelia burgdorferi p66 fragments to assess binding to purified integrin alpha(IIb)beta(3).
- Employed synthetic peptides derived from the p66 amino acid sequence to evaluate inhibition of B. burgdorferi attachment to alpha(IIb)beta(3).
Main Results:
- Identified two distinct, noncontiguous segments within the p66 protein that are critical for binding to integrin alpha(IIb)beta(3).
- Demonstrated that these specific regions are necessary for the interaction between the Lyme disease agent and the integrin receptor.
Conclusions:
- The tertiary structure of the outer membrane protein p66, rather than just linear sequences, is vital for its recognition by integrin alpha(IIb)beta(3).
- These findings contribute to understanding the molecular mechanisms of Borrelia burgdorferi adhesion and potential host-pathogen interactions.