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<dc:title xml:lang="en">Structural and functional investigations of designed histidine-rich peptides with potent antimicrobial, transfection, and lentiviral transduction activities</dc:title>
<dcterms:alternative xml:lang="fr">Recherches structurales et fonctionnelles sur les peptides riches en histidine présentant des activités élevées antimicrobienne, de transfection et de transduction lentivirale.</dcterms:alternative>
<dc:subject xml:lang="fr">Hélice amphipathique</dc:subject>
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<dc:subject xml:lang="fr">Peptide pénétrant des cellules</dc:subject>
<dc:subject xml:lang="fr">Angle hydrophile</dc:subject>
<dc:subject xml:lang="fr">Activité antibactérienne</dc:subject>
<dc:subject xml:lang="fr">Transduction lentivirale</dc:subject>
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<dc:subject xml:lang="fr">Fibres</dc:subject>
<dc:subject xml:lang="fr">Assemblage supramoléculaire</dc:subject>
<dc:subject xml:lang="en">Amphipathic helix</dc:subject>
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<dc:subject xml:lang="en">Hydrophilic angle</dc:subject>
<dc:subject xml:lang="en">Antibacterial activity</dc:subject>
<dc:subject xml:lang="en">Lentiviral transduction</dc:subject>
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<dc:subject xml:lang="en">Fibril</dc:subject>
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<dcterms:abstract xml:lang="fr">La famille LAH4 comprend des dérivés de ce peptide, cationiques et capables de se structurer en hélice α amphipathique en fonction du pH de l’environnement. Ils interagissent et perturbent les membranes, sont utilisées pour diverses applications biologiques : antimicrobiennes, de transfection et de transduction. Le travail de cette thèse a pour but de comprendre la relation entre la similitude des séquences et la variété des activités biologiques. Il s’articule en trois parties : tout d’abord, l’étude de l’effet de la modification de la séquence sur deux séries « LAH4-An » et « LAH4-Ln » basées sur le changement de l’angle hydrophile ; puis l’étude des conditions de fibrillation de LAH4-A4, LAH4-L1 et LAH4 afin de mieux comprendre leurs auto-assemblages puisque la formation de fibres s’est montrée important pour la transduction. Et enfin, la détermination de la structure des fibres de LAH4-A4 puisqu’elle est essentielle pour comprendre leurs mécanismes d’action.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The LAH4 family is composed of cationic peptides derived from LAH4, all able to structure into amphipathic α-helix depending on the pH of the environment. They interact and disrupt membranes, are used for various biological applications: antimicrobial, transfection and transduction. The work of this thesis deals with the understanding of the relationship between the sequence similarity and the variety of biological activities. It was divided into three parts : first, the study of sequence modification effect on the two series "LAH4-An" and "LAH4-Ln" based on the hydrophilic angle change; then, the study of fibrillation conditions of LAH4-A4, LAH4-L1 and LAH4 to better understand their self-assemblies since fibril formation has been important for transduction. And finally, the determination of the fibrils structure of LAH4-A4 since it is essential to understand their mechanisms of action.</dcterms:abstract>
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