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Maujean T, Wagner P, Valencia C, Riché S, Iturrioz X, Villa P, Girard N, Karpenko J, Gulea M, Bonnet D. Rapid and Highly Selective Fluorescent Labeling of Peptides via a Thia-Diels-Alder Cycloaddition: Application to Apelin. Bioconjug Chem 2023; 34:162-168. [PMID: 36534753 DOI: 10.1021/acs.bioconjchem.2c00500] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Herein, we describe a catalyst-free thia-Diels-Alder cycloaddition for the chemoselective labeling of fully deprotected phosphonodithioester-peptides in solution with fluorophores functionalized with an exocyclic diene. The reaction was optimized on the model tripeptide 1 containing a lysine residue, which enabled its rapid and straightforward labeling with three different fluorophores (fluorescein, lissamine rhodamine B, and squaraine) in very mild conditions (H2O/iPrOH, 37 °C, 1 h). The reaction was then successfully applied to the chemoselective labeling of fully deprotected apelin-13 with squaraine dye. The resulting fluorescent ligand 18 exhibited a high affinity (0.17 ± 0.03 nM) for apelinR. It enabled the development of time-resolved FRET-based competition assays for high-throughput screening and drug discovery. Thanks to its fluorogenic properties, ligand 18 was also successfully involved in the live-cell optical imaging of apelinR in no-wash conditions.
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Affiliation(s)
- Timothé Maujean
- Université de Strasbourg, CNRS, Laboratoire d'Innovation Thérapeutique, LIT UMR 7200, F-67400 Strasbourg, France
| | - Patrick Wagner
- Université de Strasbourg, CNRS, Laboratoire d'Innovation Thérapeutique, LIT UMR 7200, F-67400 Strasbourg, France
| | - Christel Valencia
- Université de Strasbourg, CNRS, PCBIS Plateforme de chimie biologie intégrative de Strasbourg, UAR 3286, F-67412 Illkirch, France
| | - Stéphanie Riché
- Université de Strasbourg, CNRS, Laboratoire d'Innovation Thérapeutique, LIT UMR 7200, F-67400 Strasbourg, France
| | - Xavier Iturrioz
- CEA, Institute of Biology and Technology, Service d'Ingénierie Moléculaire des Protéines, F-91191 Gif-sur-Yvette, France
| | - Pascal Villa
- Université de Strasbourg, CNRS, PCBIS Plateforme de chimie biologie intégrative de Strasbourg, UAR 3286, F-67412 Illkirch, France
| | - Nicolas Girard
- Université de Strasbourg, CNRS, Laboratoire d'Innovation Thérapeutique, LIT UMR 7200, F-67400 Strasbourg, France
| | - Julie Karpenko
- Université de Strasbourg, CNRS, Laboratoire d'Innovation Thérapeutique, LIT UMR 7200, F-67400 Strasbourg, France
| | - Mihaela Gulea
- Université de Strasbourg, CNRS, Laboratoire d'Innovation Thérapeutique, LIT UMR 7200, F-67400 Strasbourg, France
| | - Dominique Bonnet
- Université de Strasbourg, CNRS, Laboratoire d'Innovation Thérapeutique, LIT UMR 7200, F-67400 Strasbourg, France
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Kawano K, Yokoyama F, Kamasaka K, Kawamoto J, Ogawa T, Kurihara T, Futaki S. Design of the N-Terminus Substituted Curvature-Sensing Peptides That Exhibit Highly Sensitive Detection Ability of Bacterial Extracellular Vesicles. Chem Pharm Bull (Tokyo) 2021; 69:1075-1082. [PMID: 34719589 DOI: 10.1248/cpb.c21-00516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Extracellular vesicles (EVs) have emerged as important targets in biological and medical studies because they are involved in diverse human diseases and bacterial pathogenesis. Although antibodies targeting the surface biomarkers are widely used to detect EVs, peptide-based curvature sensors are currently attracting an attention as a novel tool for marker-free EV detection techniques. We have previously created a curvature-sensing peptide, FAAV and applied it to develop a simple and rapid method for detection of bacterial EVs in cultured media. The method utilized the fluorescence/Förster resonance energy transfer (FRET) phenomenon to achieve the high sensitivity to changes in the EV amount. In the present study, to develop a practical and easy-to-use approach that can detect bacterial EVs by peptides alone, we designed novel curvature-sensing peptides, N-terminus-substituted FAAV (nFAAV) peptides. The nFAAV peptides exerted higher α-helix-stabilizing effects than FAAV upon binding to vesicles while maintaining a random coil structure in aqueous solution. One of the nFAAV peptides showed a superior binding affinity for bacterial EVs and detected changes in the EV amount with 5-fold higher sensitivity than FAAV even in the presence of the EV-secretory bacterial cells. We named nFAAV5, which exhibited the high ability to detect bacterial EVs, as an EV-sensing peptide. Our finding is that the coil-α-helix structural transition of the nFAAV peptides serve as a key structural factor for highly sensitive detection of bacterial EVs.
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Affiliation(s)
- Kenichi Kawano
- Laboratory of Biofunctional Design Chemistry, Institute for Chemical Research, Kyoto University
| | - Fumiaki Yokoyama
- Laboratory of Molecular Microbial Science, Institute for Chemical Research, Kyoto University
| | - Kouhei Kamasaka
- Laboratory of Molecular Microbial Science, Institute for Chemical Research, Kyoto University
| | - Jun Kawamoto
- Laboratory of Molecular Microbial Science, Institute for Chemical Research, Kyoto University
| | - Takuya Ogawa
- Laboratory of Molecular Microbial Science, Institute for Chemical Research, Kyoto University
| | - Tatsuo Kurihara
- Laboratory of Molecular Microbial Science, Institute for Chemical Research, Kyoto University
| | - Shiroh Futaki
- Laboratory of Biofunctional Design Chemistry, Institute for Chemical Research, Kyoto University
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