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<dc:title xml:lang="fr">Complexes de cuivre(II) à ligands redox non-innocents : trifluorméthylation de peptides et application comme sonde en RMN du fluor pour doser le Cu(II) en milieux biologiques</dc:title>
<dcterms:alternative xml:lang="en">Copper(II) complexes with non-innocent redox ligands : trifluoromethylation of peptides and use as a Fluorine NMR probe to measure Cu(II) in biological samples</dcterms:alternative>
<dc:subject xml:lang="fr">Peptides</dc:subject>
<dc:subject xml:lang="fr">Trifluorométhylation</dc:subject>
<dc:subject xml:lang="fr">Désulfurisation</dc:subject>
<dc:subject xml:lang="fr">Déhydroalanine</dc:subject>
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<dc:subject xml:lang="fr">RMN du fluor 19</dc:subject>
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<dcterms:abstract xml:lang="fr">L’introduction du groupement trifluorométhyle (CF3) dans des biomolécules, comme les peptides, est particulièrement utile pour moduler leurs propriétés physico-chimiques. Cependant, la difficulté de créer des liaisons C-CF3 en conditions douces reste un défi chimique. S’inspirant de la chimie redox des métalloenzymes capables de stocker et de libérer des électrons, nous avons exploré l'utilisation de ligands hydrosolubles redox-actifs pour former un complexe à cuivre(II) capable d’effectuer la trifluorométhylation sélective des résidus tryptophanes de peptides dans des conditions douces. La combinaison de ce complexe avec le réactif de Togni II a permis de développer un système catalytique bien défini, générant des radicaux CF3 de manière contrôlée. Par la suite, des méthodes radicalaires ont été appliquées à des peptides à cystéine afin d’étudier la conversion du groupement thiol SH en groupement S-CF3 ou encore la désulfurisation et formation de déhydroalanine. Enfin, ces études ont permis la synthèse de sondes peptidiques trifluorométhylées utilisées pour détecter et quantifier du Cu(II) par RMN 19F dans des échantillons biologiques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The incorporation of trifluoromethyl (CF3) groups into biomolecules such as peptides has proven to be a valuable strategy for the fine-tuning of their physicochemical properties. However, achieving C-CF3 bond formation under mild conditions remains a chemical challenge. Inspired by the redox chemistry of metalloenzymes, which exhibit electron storage and release capabilities, we explored the use of redox-active ligands to form a water-soluble copper(II) complex for selective trifluoromethylation of tryptophan residues within peptides. The judicious combination of this copper(II) complex with the Togni II reagent provided an innovative platform, enabling controlled generation of CF3 radicals through a catalytic cycle. Then, radical methodologies were applied to cysteine-containing peptides to investigate the transformation of the thiol moiety into an S-CF3 group or for desulfurization and dehydroalanine formation. Finally, these studies led to the synthesis of trifluoromethylated peptidic probes, which were employed for sensitive detection and quantitative analysis of Cu(II) ions through 19F NMR in diverse biological samples.</dcterms:abstract>
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