title: Deciphering the energy landscape of the interaction uranyl-DCP with antibodies using dynamic force spectroscopy.
abstract: Previous studies on molecular recognition of uranyl-DCP (dicarboxy-phenanthroline chelator) compound by two distinct monoclonal antibodies (Mabs U04S and U08S) clearly showed the presence of a biphasic shape in Bell-Evans' plots and an accentuated difference in slopes at the high loading rates. To further explore the basis in the slope difference, we have performed complementary experiments using antibody PHE03S, raised against uranyl-DCP but, presenting a strong cross-reactivity toward the DCP chelator. This work allowed us to obtain a reallocation of the respective contributions of the metal ion itself and that of the chelator. Results led us to propose a 2D schematic model representing two energy barriers observed in the systems Mabs U04S- and U08S-[UO(2)-DCP] where the outer barrier characterizes the interaction between UO(2) and Mab whereas the inner barrier characterizes the interaction between DCP and Mab. Using dynamic force spectroscopy, it is thus possible to dissect molecular interactions during the unbinding between proteins and ligands.
authors.affiliation: Commissariat à l'Energie Atomique, Institute for Biotechnology and Environmental Biology, Marcoule, F-30207 Bagnols sur Cèze, France.
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Teulon
authors.forename: Pierre
authors.initials: P
authors.lastname: Parot
authors.forename: Michael
authors.initials: M
authors.lastname: Odorico
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Pellequer
mesh_terms: D000911:Antibodies, Monoclonal / Q000737:chemistry*; D001665:Binding Sites; D002614:Chelating Agents / Q000737:chemistry*; D004735:Energy Transfer; D018625:Microscopy, Atomic Force / Q000379:methods*; D010618:Phenanthrolines / Q000737:chemistry*; D011485:Protein Binding; D025941:Protein Interaction Mapping / Q000379:methods; D017974:Uranium Compounds / Q000737:chemistry*
chemical_list: D000911:Antibodies, Monoclonal; D002614:Chelating Agents; D010618:Phenanthrolines; D017974:Uranium Compounds
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