Nanoscale mapping and functional analysis of individual adhesins on living bacteria
| Autor: | Franco D. Menozzi, Vincent Dupres, Brian H. Clare, Coralie Bompard, Nicholas L. Abbott, Camille Locht, Stéphane Cuenot, Dominique Raze, Yves F. Dufrêne |
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| Rok vydání: | 2005 |
| Předmět: |
Glycoconjugate
Plasma protein binding Microscopy Atomic Force medicine.disease_cause Biochemistry Microbiology Micromanipulation Bacterial Proteins Protein Interaction Mapping medicine Nanotechnology Adhesins Bacterial Molecular Biology chemistry.chemical_classification biology Heparin Cell Membrane Intermolecular force Membrane Proteins Pathogenic bacteria Mycobacterium tuberculosis Cell Biology Adhesion biology.organism_classification Bacterial adhesin chemistry Interaction with host Biophysics Stress Mechanical Bacteria Protein Binding Biotechnology |
| Zdroj: | Nature Methods. 2:515-520 |
| ISSN: | 1548-7105 1548-7091 |
| DOI: | 10.1038/nmeth769 |
| Popis: | Although much progress has been made in the identification and characterization of adhesins borne by pathogenic bacteria, the molecular details underlying their interaction with host receptors remain largely unknown owing to the lack of appropriate probing techniques. Here we report a method, based on atomic force microscopy (AFM) with tips bearing biologically active molecules, for measuring the specific binding forces of individual adhesins and for mapping their distribution on the surface of living bacteria. First, we determined the adhesion forces between the heparin-binding haemagglutinin adhesin (HBHA) produced by Mycobacterium tuberculosis and heparin, used as a model sulphated glycoconjugate receptor. Both the adhesion frequency and adhesion force increased with contact time, indicating that the HBHA-heparin complex is formed via multiple intermolecular bridges. We then mapped the distribution of single HBHA molecules on the surface of living mycobacteria and found that the adhesin is not randomly distributed over the mycobacterial surface, but concentrated into nanodomains. |
| Databáze: | OpenAIRE |
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