A Selective Cucurbit[8]uril-Peptide Beacon Ensemble for the Ratiometric Fluorescence Detection of Peptides |
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| Authors: | Dr. Debabrata Maity Dr. Khaleel I. Assaf Wilhelm Sicking Dr. Christoph Hirschhäuser Prof. Dr. Werner M. Nau Prof. Dr. Carsten Schmuck |
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| Affiliation: | 1. Institute of Organic Chemistry, University of Duisburg–Essen, Universitatsstrasse 7, 45117 Essen, Germany;2. Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany |
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| Abstract: | A convenient supramolecular strategy for constructing a ratiometric fluorescent chemosensing ensemble, consisting of a macrocyclic host (cucurbit[8]uril CB[8]), and a pyrene-tagged amphiphilic peptide beacon (AP 1), is reported. AP 1 unfolds upon encapsulation of the pyrene termini into the hydrophobic CB[8] cavity. This changes pyrene excimer to monomer emission. Substrates with higher affinity for the CB[8] cavity can displace AP 1 from the ensemble. The released AP 1 folds again to form a pyrene excimer, which allows for the ratiometric fluorescence monitoring of the substrate. In this report, the ensemble capacity for ratiometric fluorescence monitoring of biological substrates, such as amino acid derivatives, specific peptides, and proteins, in aqueous media is demonstrated. |
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| Keywords: | cucurbit[n]uril fluorescence insulin peptide beacon supramolecular chemistry |
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