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<dc:title xml:lang="fr">Etude structurale et fonctionnelle des assemblages supramoléculaires du peptide Vectofusin-1</dc:title>
<dcterms:alternative xml:lang="en">Functional and structural study of Vectofusin-1 peptide supramolecular assembly</dcterms:alternative>
<dc:subject xml:lang="fr">Peptides antimicrobiens</dc:subject>
<dc:subject xml:lang="fr">Transduction lentivirale</dc:subject>
<dc:subject xml:lang="fr">Assemblages supramoléculaires</dc:subject>
<dc:subject xml:lang="fr">Nanofi-brilles</dc:subject>
<dc:subject xml:lang="fr">Expression bactérienne</dc:subject>
<dc:subject xml:lang="fr">Marquage isotopique</dc:subject>
<dc:subject xml:lang="fr">RMN du solide</dc:subject>
<dc:subject xml:lang="fr">Interaction peptide-peptide</dc:subject>
<dc:subject xml:lang="en">Antimicrobial peptides</dc:subject>
<dc:subject xml:lang="en">Lentiviral transduction</dc:subject>
<dc:subject xml:lang="en">Supramolecular assemblies</dc:subject>
<dc:subject xml:lang="en">Nanofibrils</dc:subject>
<dc:subject xml:lang="en">Bacterial expression</dc:subject>
<dc:subject xml:lang="en">Isotope labelling</dc:subject>
<dc:subject xml:lang="en">Solid state NMR</dc:subject>
<dc:subject xml:lang="en">Peptide-peptide interaction</dc:subject>
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<tef:elementdEntree autoriteExterne="027828875" autoriteSource="Sudoc">Traceurs radioactifs</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027675009" autoriteSource="Sudoc">Résonance magnétique nucléaire</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les peptides de la famille LAH4 sont des peptides cationiques qui se replient en hélices alpha et in- teragissent avec les membranes phospholipidiques. Ces peptides peuvent s’assembler en nano-fibrilles. Dans cette thèse, nous avons étudié le dérivé LAH4-A4 breveté sous le nom Vectofusin-1. Une étude fonctionnelle a révélé que ses propriétés d’auto-assemblage influencent son activité biologique en tant qu’adjuvant améliorant la transduction lentivirale. Lors d’une collaboration avec le laboratoire ART- TG, nous avons montré que les formes fibrillaires et monomériques de Vectofusin-1 diffèrent en activité biologique, notamment selon le type cellulaire. Un protocole de production et purification du peptide Vectofusin-1 basé sur l’expression en système bactérien avec marquage isotopique a été mis en place. Une étude biophysique, par microscopie électronique, a démontré que la formation de fibrilles dépend de paramètres précis comme le pH, le solvant et la température. Une étude structurale par RMN du solide a permis de caractériser en partie les interactions impliquées dans la formation et la stabilisation des fibrilles.</dcterms:abstract>
<dcterms:abstract xml:lang="en">LAH4 peptides are cationic peptides that fold into alpha-helices and interact with phospholipid mem- branes. These peptides can assemble into nanofibrils.In this thesis, we studied the LAH4-A4 derivative patented under the name Vectofusin-1. A functional study revealed that its self-assembly properties influence its biological activity as an adjuvant enhancing lentiviral transduction. In collaboration with the ART-TG laboratory, we demonstrated that the fibrillar and monomeric forms of Vectofusin-1 differ in biological activity, particularly depending on the cell type. A protocol for producing and purifying Vectofusin-1 peptide based on isotopically labeled bacterial ex- pression was established.A biophysical study using electron microscopy showed that fibril formation depends on specific pa- rameters such as pH, solvent, and temperature. A structural study using solid-state NMR partially characterized the interactions involved in the formation and stabilization of fibrils.</dcterms:abstract>
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