title: Sensing based on assessment of non-monotonous effect determined by target analyte: case study on pore-forming compounds.
abstract: A new and exciting biosensing avenue based on assessment of the non-monotonous, concentration dependent effect of pore formation is discussed. A novel kinetic model is advanced to relate surface plasmon resonance (SPR) data with actual concentrations of interacting partners. Lipid modified L1 sensor chip provide the accessible platform for SPR exploration of peptide-membrane interaction, with POPC and melittin as model systems. We show that quantitative assessment of the interaction between an antimicrobial peptide and lipid modified sensors is capable to provide both sensing avenues and detailed mechanistic insights into effects of pore-forming compounds. The proposed model combined with appropriate design of the experimental protocol adds a new depth to the classic SPR investigation of peptide-lipid interaction offering a quantitative platform for detection, improved understanding of the manifold facets of the interaction and for supporting the controlled design of novel antimicrobial compounds. This biosensing approach can be applied to an entire set of pore-forming compounds including antimicrobial peptides and exo-toxins.
authors.affiliation: International Centre of Biodynamics, 1B Intrarea Portocalelor 060101 Bucharest 6, Romania.
authors.forename: Mihaela
authors.initials: M
authors.lastname: Gheorghiu
authors.forename: Andreea
authors.initials: A
authors.lastname: Olaru
authors.forename: Aurelia
authors.initials: A
authors.lastname: Tar
authors.forename: Cristina
authors.initials: C
authors.lastname: Polonschii
authors.forename: Eugen
authors.initials: E
authors.lastname: Gheorghiu
mesh_terms: D023181:Antimicrobial Cationic Peptides / Q000032:analysis* / Q000737:chemistry*; D015374:Biosensing Techniques / Q000379:methods*; D008051:Lipid Bilayers / Q000737:chemistry*; D016062:Porosity; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D023181:Antimicrobial Cationic Peptides; D008051:Lipid Bilayers