Rational Design of a Redox-Labeled Chiral Target for an Enantioselective Aptamer-Based Electrochemical Binding Assay
A series of redox-labeled L-tyrosinamide (L-Tym) derivatives was prepared and the nature of the functional group and the chain length of the spacer were systematically varied in a step-by-step affinity optimization process of the tracer for the L-Tym aptamer. The choice of the labeling position on L-Tym proved to be crucial for the mol. recognition event, which could be monitored by cyclic voltammetry and is based on the different diffusion rates of free and bound targets in solution From this screening approach an efficient electroactive tracer emerged. Comparable dissociation constants Kd were obtained for the unlabeled and labeled targets in direct or competitive binding assays. The enantiomeric tracer was prepared and its enantioselective recognition by the corresponding anti-L-Tym aptamer was demonstrated. The access to both enantiomeric tracer mols. opens the door for the development of one-pot determination of the enantiomeric excess when using different labels with well-separated redox potentials for each enantiomer.
Références
- Titre
- Rational Design of a Redox-Labeled Chiral Target for an Enantioselective Aptamer-Based Electrochemical Binding Assay
- Type de publication
- Article de revue
- Année de publication
- 2014
- Auteurs
- Moreau, Julie, Challier Lylian, Lalaoui Noemie, Mavre Francois, Noel Vincent, Limoges Benoit, Schoellhorn Bernd, and Fave Claire
- Revue
- Chemistry - A European Journal
- Volume
- 20
- Pagination
- 2953–2959
- ISSN
- 1521-3765
Soumis le 8 septembre 2022