title: Rapid colorimetric detection of antibody-epitope recognition at a biomimetic membrane interface.
abstract: Biomolecular recognition of antigens and epitopes by antibodies is a fundamental event in the initiation of immune response and plays a central role in a variety of biochemical processes. Peptide binding requires, in many cases, presentation of the peptides at interfaces, such as protein surfaces, cellular membranes, and synthetic polymer surfaces. We describe a novel molecular system in which interactions between antibodies and peptide epitopes displayed at a biomimetic membrane interface can be detected through induction of visible, rapid color transitions. The colorimetric assembly consists of a phospholipid/polydiacetylene matrix anchoring a hydrophobic peptide displaying the epitope at its N-terminus. The colorimetric transitions observed in the assembly, corresponding to perturbation of the polydiacetylene framework, are induced only upon recognition of the displayed epitope by its specific antibody present in the aqueous solution. Significantly, the color changes occur after a single mixing step, without further chemical reactions or enzymatic processing. The new molecular system could be utilized for studying antigen-antibody interactions and peptide-protein recognition, epitope mapping, and rapid screening of biological and chemical libraries.
authors.affiliation: Contribution from the Ilse Katz Center for Meso- and Nano-Science and Technology and Department of Chemistry, Ben Gurion University of the Negev, Beersheva 84105, Israel.
authors.forename: S
authors.initials: S
authors.lastname: Kolusheva
authors.forename: R
authors.initials: R
authors.lastname: Kafri
authors.forename: M
authors.initials: M
authors.lastname: Katz
authors.forename: R
authors.initials: R
authors.lastname: Jelinek
mesh_terms: D000911:Antibodies, Monoclonal / Q000378:metabolism; D000936:Antigen-Antibody Complex / Q000032:analysis*; D003116:Color; D000939:Epitopes / Q000378:metabolism; D005231:Fatty Acids, Unsaturated / Q000737:chemistry / Q000378:metabolism; D006801:Humans; D008567:Membranes, Artificial; D008854:Microscopy, Electron; D010713:Phosphatidylcholines / Q000378:metabolism; D013057:Spectrum Analysis
chemical_list: C434762:10,12-tricosadiynoic acid; D000911:Antibodies, Monoclonal; D000936:Antigen-Antibody Complex; D000939:Epitopes; D005231:Fatty Acids, Unsaturated; D008567:Membranes, Artificial; D010713:Phosphatidylcholines; C068166:tricosanoic acid