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<dc:title xml:lang="fr">Conception et caractérisation de complexes protéiques à topologie non classique pour l'étude de protéines intrinsèquement désordonnées</dc:title>
<dcterms:alternative xml:lang="en">Design and characterization of protein complexes with non-canonical topology to study intrinsically disordered proteins</dcterms:alternative>
<dc:subject xml:lang="fr">Protéines intrinsèquement désordonnées</dc:subject>
<dc:subject xml:lang="fr">Topologie non-classique</dc:subject>
<dc:subject xml:lang="fr">Peptide cyclique</dc:subject>
<dc:subject xml:lang="fr">Synthèse chimio-enzymatique</dc:subject>
<dc:subject xml:lang="fr">Études biophysiques</dc:subject>
<dc:subject xml:lang="fr">Production recombinante</dc:subject>
<dc:subject xml:lang="fr">Pénétration cellulaire</dc:subject>
<dc:subject xml:lang="en">Intrinsically disordered proteins</dc:subject>
<dc:subject xml:lang="en">Non-canonical topology</dc:subject>
<dc:subject xml:lang="en">Cyclic peptide</dc:subject>
<dc:subject xml:lang="en">Chemoenzymatic synthesis</dc:subject>
<dc:subject xml:lang="en">Biophysical studies</dc:subject>
<dc:subject xml:lang="en">Recombinant production</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse s’est concentrée sur la conception moléculaire de complexes protéiques non-classiques afin d’étudier l’interaction entre les coactivateurs transcriptionnels liés au cancer, ACTR et CBP/p300, qui contiennent des régions intrinsèquement désordonnées. Des variants conformationnellement contraints du domaine d’activation d’ACTR ont été développés par cyclisation tête-à-queue et/ou incorporation d’acides aminés α-méthylés. Une stratégie chimio-enzymatique combinant la synthèse peptidique sur phase solide et la cyclisation enzymatique a permis la production d’analogues cycliques d’ACTR. Les propriétés biophysiques de ces variants ont été déterminées afin d’évaluer l’impact des contraintes conformationnelles. De plus, l’ACTR cyclique ainsi que son domaine de liaison issu de CBP ont été produits de manière recombinante et marqués avec des isotopes 13C et 15N pour des analyses par RMN, dans le but d’obtenir des informations structurales. Enfin, des essais cellulaires préliminaires ont été réalisés pour évaluer l’efficacité de pénétration de ces variantes dans des cellules cancéreuses de la prostate.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis focused on the molecular design of non-canonical protein complexes to study the interaction between the cancer-related transcriptional coactivators ACTR and CBP/p300 containing intrinsically disordered regions. Conformationally constrained variants of the activation domain of ACTR were developed through head-to-tail cyclization and/or incorporation of α-methylated amino acids. A chemoenzymatic strategy combining solid-phase peptide synthesis with enzymatic cyclization enabled the production of cyclic ACTR analogues. The biophysical properties of these variants were determined to assess the impact of conformational constraints. Furthermore, the cyclic ACTR as well as its binding domain from CBP were recombinantly produced and labelled with 13C,15N-isotopes for NMR analysis to gain structural insights. Finally, preliminary cellular assays were conducted to evaluate the penetration efficiency of these variants into prostate cancer cells.</dcterms:abstract>
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