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• W2317179612 startingPage "11045" @default.
• W2317179612 abstract "Binding kinetics of the multivalent proteins peanut agglutinin (PnA) and cholera toxin B subunit (CTB) to a GM1-doped 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) lipid bilayer were investigated by both second-harmonic correlation spectroscopy (SHCS) and a traditional equilibrium binding isotherm. Adsorption and desorption rates, as well as binding affinity and binding free energy, for three bulk protein concentrations were determined by SHCS. For PnA binding to GM1, the measured adsorption rate decreased with increasing bulk PnA concentration from (3.7 ± 0.3) × 106 M–1·s–1 at 0.43 μM PnA to (1.1 ± 0.1) × 105 M–1·s–1 at 12 μM PnA. CTB–GM1 exhibited a similar trend, decreasing from (1.0 ± 0.1) × 109 M–1·s–1 at 0.5 nM CTB to (3.5 ± 0.2) × 106 M–1·s–1 at 240 nM CTB. The measured desorption rates in both studies did not exhibit any dependence on initial protein concentration. As such, 0.43 μM PnA and 0.5 nM CTB had the strongest measured binding affinities, (3.7 ± 0.8) × 109 M–1 and (2.8 ± 0.5) × 1013 M–1, respectively. Analysis of the binding isotherm data suggests there is electrostatic repulsion between protein molecules when PnA binds GM1, while CTB–GM1 demonstrates positive ligand–ligand cooperativity. This study provides additional insight into the complex interactions between multivalent proteins and their ligands and showcases SHCS for examining these complex yet technologically important protein–ligand complexes used in biosensors, immunoassays, and other biomedical diagnostics." @default.
• W2317179612 created "2016-06-24" @default.
• W2317179612 creator A5003379081 @default.
• W2317179612 creator A5042189338 @default.
• W2317179612 date "2014-10-29" @default.
• W2317179612 modified "2023-10-17" @default.
• W2317179612 title "Determination of Multivalent Protein–Ligand Binding Kinetics by Second-Harmonic Correlation Spectroscopy" @default.
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• W2317179612 doi "https://doi.org/10.1021/ac500094v" @default.
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