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<dc:title xml:lang="fr">Conception et application de nouveaux outils photochimiques pour l’étude des récepteurs canaux P2X</dc:title>
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<dc:subject xml:lang="fr">Électrophysiologie patch-clamp</dc:subject>
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<dcterms:abstract xml:lang="fr">Les récepteurs P2X (P2XR), activés par l’ATP, sont impliqués dans des rôles physiopathologiques. Leur fonctionnement est associé à différents états conformationnels. Le projet de thèse a mené à associer la synthèse organique et l’application de molécules photo-activables avec des techniques d’électrophysiologie patch-clamp, pour décortiquer les mouvements moléculaires de ces récepteurs et effectuer des relations structure-fonction, via trois stratégies : - La synthèse et application d’agrafes photo-isomérisables qui permet le photo-contrôle des P2XR et l’étude de mouvements - La synthèse et caractérisation d’un acide aminé (aa) photo-clivable pour étudier les implications de zones sur la fonction des P2XR via une photolyse - L’incorporation d’un aa non naturel dans les P2XR pour étudier des interactions et mouvements via un « photo-pontage ». Nous avons élucidé les mécanismes moléculaires responsables de la perméabilité des P2XR, récusé l’existence de l'état dilaté et identifié un cation organique physiologique pouvant les traverser. Nous avons aussi conçu un acide aminé photo-clivable pouvant mener à des études structure-fonction des P2XR.</dcterms:abstract>
<dcterms:abstract xml:lang="en">P2X receptors are cationic ligand-gated ion channels, activated by extracellular ATP, involved in many physio-pathological roles. Their function is associated with different allosteric states. During this PhD, we have designed three new strategies, spanning photochemical organic synthesis and patch-clamp electrophysiology to elucidate the molecular mechanisms involved in these conformational states and to collect data in order to study structure-function relationships. - Synthesis and application of molecular tweezers, which allows the photo-control of P2X Rand the study of molecular motions - Synthesis and characterization of a photo-cleavable amino acid with the aim of incorporating it into P2XR and doing structure-function relationships - Incorporation of an unnatural amino acid for photo-crosslinking studies. We have been able to probe the molecular mechanism involved in large organic cations permeation of P2XR, to bring into question the dilated state and to identify a physiological cation that can flow through P2XR. We have also designed a photo-cleavable amino acid which could serve in the study of structure-function relationships.</dcterms:abstract>
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