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Production de domaines recombinants PRODH en vue de l'analyse structurale & Caractérisation de la région 51-160 de la protéine KIN17 humaine par RMN et Modélisation Moléculaire

( Télécharger le fichier original )
par Ludovic Carlier
Université de Rouen - Doctorat de biologie structurale 2006
  

précédent sommaire

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Résumé

Le maintien de l'intégrité du patrimoine génétique est essentiel à la survie des organismes vivants. Face aux nombreuses sources de stress génotoxiques qui induisent des dommages de l'ADN,

les cellules ont mis en place des mécanismes complexes capables de détecter et réparer ces lésions. Parmi ces sources, figurent les rayonnements ultraviolets (UV) contenus dans la lumière solaire, qui modifient la structure de l'ADN et peuvent conduire à l'introduction de mutations. Chez l'homme, la grande majorité des dommages de l'ADN produits par les rayonnements est éliminée par le système NER (Nucleotide Excision Repair), un système capable d'exciser les nucléotides lésés et de les remplacer. Une déficience de cette voie de réparation peut mener à l'apoptose (mort programmée des cellules), et augmente la susceptibilité de développer des maladies graves telles que le cancer. Le système NER met en oeuvre de nombreuses protéines impliquées dans des mécanismes variés tels que

la détection, la signalisation, ou la réparation de l'ADN. La protéine eucaryote KIN17, récemment découverte dans le noyau de la cellule humaine, semble appartenir à ce système de réparation. Cependant, son rôle précis dans la réponse aux dommages de l'ADN reste à ce jour inconnu. C'est pourquoi, nous avons entrepris une caractérisation structurale et fonctionnelle de la région 51-160 de

la protéine KIN17 humaine (domaine K2) afin d'améliorer la connaissance de ses fonctions, de ses partenaires biologiques, et de ses modes de fonctionnement.

La première partie de ce manuscrit est consacrée à la préparation de l'échantillon de protéine

en vue d'une analyse structurale par Résonance Magnétique Nucléaire (RMN). Le travail a dans un premier temps consisté à choisir et optimiser le système d'expression de domaines structuraux d'une autre protéine : la proline déshydrogénase PRODH.

Dans un second temps, la meilleure stratégie de préparation de l'échantillon a été appliquée à

la protéine KIN17 pour produire, puis résoudre la structure tridimensionnelle du domaine K2 par RMN et Modélisation Moléculaire. Nous avons montré que la région 51-160 de la protéine KIN17 humaine adopte un repliement caractéristique de la famille structurale « Winged Helix » des protéines

de liaison aux acides nucléiques. Cependant, l'analyse des détails structuraux du domaine K2, la comparaison avec des protéines de fonction connue de la même classe structurale, et des études électrophorétiques, révèlent l'incapacité de ce domaine à lier l'ADN et l'ARN de manière autonome.

En revanche, nous avons mis en évidence, par une étude RMN complémentaire, l'existence d'une surface ultra conservée impliquée dans des interactions de type protéine-protéine intra-moléculaires entre le motif « Winged Helix » de la région 51-160 et la région N-terminale 1-50 de KIN17 humaine.

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