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<dc:title xml:lang="fr">Exploration de la transmission synaptique et de la régulation des récepteurs ionotropes par simulations de dynamique moléculaire et électrophysiologie numérique</dc:title>
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<dc:subject xml:lang="fr">Dynamique moléculaire</dc:subject>
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<dc:subject xml:lang="fr">Récepteur de la glycine</dc:subject>
<dc:subject xml:lang="fr">Transmission synaptique</dc:subject>
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<dc:subject xml:lang="en">Computational electrophysiology</dc:subject>
<dc:subject xml:lang="en">Glycine receptor</dc:subject>
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<tef:elementdEntree autoriteExterne="155395289" autoriteSource="Sudoc.FMesh">Canaux ioniques régulés par des ligands</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Au niveau de la synapse, la liaison des neurotransmetteurs aux récepteurs membranaires induit l’ouverture de canaux ioniques. Le Récepteur de la Glycine (RGly) est un récepteur ionotrope impliqué dans des troubles neuronaux tels que l’addiction, la douleur chronique, ou l’hyperekplexie ; pour cette raison il est important de développer des nouveaux traitements ciblant ce récepteur. Nous avons utilisé des simulations de Dynamiques Moléculaire (DM) et d’électrophysiologie numérique afin d’évaluer la fonction des structures du RGly disponibles et montré qu’aucune d’entre elles ne satisfait les propriétés fonctionnelles de l’état ouvert. Grâce aux simulations de DM, nous avons caractérisé une nouvelle conformation du RGly, qui est compatible avec cet état. Nous avons souligné le rôle majeur des portails latéraux pour la perméation des ions. Nous avons proposé un protocole, nommé pharmacologie dépendante de l’état, pour identifier des molécules modulatrices de protéines allostériques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Signals within neurons are mostly transmitted through chemical synapses. Signal transduction arises from the binding of neurotransmitters to membrane receptors in order to open ion channels. The Glycine Receptor (GlyR) is an ionotropic receptor which is involved in several neurological disorders such as addiction, chronic pain, or hyperekplexia. Because of its implication in human diseases, it is interesting to design novel drugs targeting this receptor. We used Molecular Dynamics (MD) simulations and computational electrophysiology to probe the function of available GlyR structures. We showed that none of the experimental structures display the physiological behavior of the conductive state. Using MD simulations, we captured a novel conformation of the GlyR compatible with a conductive state and demonstrated the importance of lateral portals for ionic permeation. Lastly, we proposed an original protocol, named state-based pharmacology, to discover modulators of allosteric proteins.</dcterms:abstract>
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