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Peptides that mimic Candida albicans-derived beta-1,2-linked mannosides
T Jouault1, C Fradin, F Dzierszinski
1Laboratoire de Mycologie Fondamentale et Appliquée, INSERM EPI 9915, Université de Lille II, Faculté de Médecine H. Warembourg, Pôle Recherche, Place Verdun, 59037 Lille Cedex, France.
Glycobiology
|August 2, 2001
Summary
Researchers identified a peptide that mimics Candida albicans beta-1,2-linked mannosides, crucial for immune cell binding and protection against candidiasis.
Area of Science:
- Immunology
- Microbiology
- Biochemistry
Background:
- Beta-1,2-linked mannosides from Candida albicans phosphopeptidomannan (PPM) interact with macrophages via a distinct receptor, stimulating immune responses.
- Antibodies targeting these beta-1,2-linked mannosides, but not alpha-linked ones, confer protection against candidiasis.
Purpose of the Study:
- To isolate peptides that mimic beta-1,2-linked mannosides using phage display.
- To characterize the mimotopic activity of selected peptides.
Main Methods:
- Phage display methodology was employed to screen a random peptide library.
- Biopanning was performed using an anti-beta-1,2-linked mannoside monoclonal antibody (mAb).
- Peptide specificity was confirmed by antibody binding assays and inhibition studies.
Main Results:
- A specific peptide sequence, FHENWPS, was identified and recognized by the anti-beta-1,2-linked mannoside mAb.
- Antibodies generated against the FHENWPS peptide bound to C. albicans PPM.
- These antibodies demonstrated inhibition by soluble beta-1,2-mannotetraose, confirming mimotopic activity.
Conclusions:
- The peptide FHENWPS effectively mimics Candida albicans beta-1,2-linked mannosides.
- This mimetic peptide can elicit protective immune responses against candidiasis.
- Phage display is a viable method for discovering functional peptide mimics of microbial carbohydrates.