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<dc:title xml:lang="fr">Autoassemblage localisé de peptides induit par des enzymes : depuis la surface de vésicules phospholipidiques vers l’élaboration d’un réacteur catalytique en flux</dc:title>
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<dcterms:abstract xml:lang="fr">L’autoassemblage localisé induit par des enzymes est un outil qui permet d’initier l’autoassemblage de nanofibres de peptides avec un contrôle spatio-temporel. Au cours de mon projet doctoral, l’alcaline phosphatase conjuguée à la streptavidine a été immobilisé à la surface de vésicules unilamellaires pour étudier l’impact du processus d’autoassemblage de peptides sur leurs propriétés physico-chimiques. Il a ainsi été montré que des déformations morphologiques et une perméabilité de la bicouche des vésicules sont provoquées par l’autoassemblage de peptides. Les nanofibres ainsi formées enrobent les vésicules de façon inhomogène. Sur la base d’une étude par microscopie optique, électronique et confocale à fluorescence, un mécanisme de formation par étape des nanofibres de peptides autour de vésicules phospholipidiques a été proposé.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Localized enzyme-assisted self-assembly is a tool to initiate the self-assembly of peptide nanofibers with spatiotemporal control. During my PhD project, streptavidin-conjugated alkaline phosphatase was immobilized on the surface of unilamellar vesicles to study the impact of the peptide self-assembly process on their physicochemical properties. It was shown that morphological deformations and transient permeability of the vesicle bilayer are caused by the self-assembly of peptides. The resulting nanofibers coat the vesicles through an inhomogeneous way. Based on light, electron and confocal fluorescence microscopy, a stepwise mechanism of peptide nanofibers formation around enzyme-modified vesicles was proposed.</dcterms:abstract>
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