http://www.cnr.it/ontology/cnr/individuo/prodotto/ID167958

Light scattered by model phantom bacteria reveals molecular interactions at their surface (Articolo in rivista)

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Label

Light scattered by model phantom bacteria reveals molecular interactions at their surface (Articolo in rivista) (literal)

Anno

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Alternative label

Ghetta A., Prosperi D., Mantegazza F., Panza L., Riva S., Bellini T. (2005)
Light scattered by model phantom bacteria reveals molecular interactions at their surface
in Proceedings of the National Academy of Sciences of the United States of America; National Academy of Sciences, Washington (Stati Uniti d'America)
(literal)

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1 Istituto di Chimica del Riconoscimento Molecolare, Consiglio Nazionale delle Ricerche, Via Mario Bianco 9, 20131 Milan, Italy 2 Dipartimento di Chimica, Biochimica e Biotecnologie per la Medicina, Universita` di Milano, Via Fratelli Cervi 93, 20090 Segrate, Italy 3 Istituto di Scienze e Tecnologie Molecolari, Consiglio Nazionale delle Ricerche, Via Golgi 19, 20133 Milan, Italy 4 Dipartimento di Medicina Sperimentale, Ambientale e Biotecnologie Mediche, Universita` di Milano-Bicocca, Via Cadore 48, 20052 Monza, Italy 5 Dipartimento di Scienze Chimiche, Alimentari, Farmaceutiche e Farmacologiche, Universita` del Piemonte Orientale, Via Bovio 6, 28100 Novara, Italy (literal)

Titolo

Light scattered by model phantom bacteria reveals molecular interactions at their surface (literal)

Abstract

Testing molecular interactions is an ubiquitous need in modern biology and molecular medicine. Here, we present a qualitative and quantitative method rooted in the basic properties of the scattering of light, enabling detailed measurement of ligand-receptor interactions occurring on the surface of colloids. The key factor is the use of receptor-coated nanospheres matched in refractive index with water and therefore optically undetectable (\"phantom\") when not involved in adhesion processes. At the occurrence of ligand binding at the receptor sites, optically unmatched material adsorbs on the nanoparticle surface, giving rise to an increment in their scattering cross section up to a maximum corresponding to saturated binding sites. The analysis of the scattering growth pattern enables extracting the binding affinity. This label-free method has been assessed through the determination of the binding constant of the antibiotic vancomycin with the tripeptide L-Lys-D-Ala-D-Ala and of the vancomycin dimerization constant. We shed light on the role of chelate effect and molecular hindrance in the activity of this glycopeptide. (literal)

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