Abstract
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.
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22 June 2005
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Notes
NOTE:The website listed in the article has been modified. The corrected citation should read: (F.D.M. and M.C. Vidal-Pessolani, unpublished data; http://genolist.pasteur.fr/Leproma/) The error has been corrected in the HTML version of the article, and this correction has been appended to the PDF version of the article.
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Acknowledgements
This work was supported by the National Foundation for Scientific Research (FNRS), the Université Catholique de Louvain (Fonds Spéciaux de Recherche), the Federal Office for Scientific, Technical and Cultural Affairs (Interuniversity Poles of Attraction Programme), the Research Department of the Communauté Française de Belgique (Concerted Research Action), the INSERM, the Institut Pasteur de Lille and the Région Nord-Pas de Calais. N.L.A. and B.H.C. acknowledge support from the US National Science Foundation through the MRSEC program. We thank G. Delogù for the gift of E. coli BL21(pGD51), E. Pradel and M. Simonet for critical reading of the manuscript, L. Piraux for the use of the thermal evaporator, E. Ferain for the use of the scanning electron microscope and P. Hinterdorfer for stimulating discussions. Y.F.D. is a Research Associate of the FNRS.
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Dupres, V., Menozzi, F., Locht, C. et al. Nanoscale mapping and functional analysis of individual adhesins on living bacteria. Nat Methods 2, 515–520 (2005). https://doi.org/10.1038/nmeth769
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DOI: https://doi.org/10.1038/nmeth769
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