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- W1971741271 abstract "Aptamers are selected DNA ligands that target biomolecules such as proteins. In recent years, they are showing an increasing interest as potential therapeutic agents or recognition elements in biosensor applications. In both cases, the need for characterizing the mating between the target and the aptamer either in solution or immobilized on a surface, is pressing. In this context, we have developed a kinetic biosensor made of micro-arrayed anti-thrombin aptamers to assess the kinetic parameters of this interaction. The binding of label-free thrombin on the biosensor was monitored in real-time by Surface Plasmon Resonance imaging. Remarkable performances were obtained for the quantification of thrombin without amplification (sub-nanomolar limit of detection and linear range of quantification to two orders of magnitude). The independent determinations of both the solution- and surface-phase affinities, respectively KDSol and KDSurf, revealed distinct values illustrating the importance of probes, targets or surface interactions in biosensors. Interestingly, KDSurf values depend on the aptamer grafting density and linearly extrapolate towards KDSol for highly diluted probes. This suggests a lesser impact of the surface compared to the probe or target cooperativity interactions since the latter decrease with a reduced grafting density." @default.
- W1971741271 created "2016-06-24" @default.
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- W1971741271 date "2013-09-17" @default.
- W1971741271 modified "2023-09-30" @default.
- W1971741271 title "Solution-Phase vs Surface-Phase Aptamer-Protein Affinity from a Label-Free Kinetic Biosensor" @default.
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- W1971741271 doi "https://doi.org/10.1371/journal.pone.0075419" @default.
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