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<dc:title xml:lang="fr">Production des polypeptides issus des glycoprotéines d'enveloppe du VIH-1 pour des études biophysique et structurale par RMN et DC</dc:title>
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<dc:subject xml:lang="fr">Surexpression en système bactérien</dc:subject>
<dc:subject xml:lang="fr">Vaccination</dc:subject>
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<dcterms:abstract xml:lang="fr">Quelques régions stables ont été découvertes sur les gp d’env du VIH-1 contre lesquelles des patients produisent des anticorps neutralisants. Les épitopes les plus prometteurs se trouvent dans la MPER et sont probablement exposés durant la fusion. Alors que les peptides isolés à partir de cette région ne sont pas parvenus à induire une réaction immunogène neutralisante, des études antérieures suggèrent que la membrane lipidique joue un rôle dans la structuration des antigènes et dans la réponse immunogénique.C’est pourquoi nous étudions la structure de ces épitopes. Cela nécessite leur surexpression, leur purification et leur reconstitution dans des liposomes. Une étude de CD montre qu’ils pourraient changer de conformation, cela sera confirmé par RMN. En outre, leur immunogénicité sera vérifiée par vaccination des souris. En plus, nous trouvons que le cholestérol peut modifier l’orientation des peptides englobant le motif CRAC de la gp41.</dcterms:abstract>
<dcterms:abstract xml:lang="en">A few stable regions have been discovered on the HIV-1 env gp against which some patients produce neutralizing antibodies. The most promising ones are located in the MPER and are probably exposed transiently during the fusion. Whereas the peptides isolated from this region failed to induce immunogenic response, previous studies suggest the lipid membrane plays a role in antigens structure and in the immunogenic response.That is why we investigate the structure of these épitopes in membrane models. This requires the production of these épitopes by bacterial overexpression, their purification and their reconstitution in liposomes. A CD study shows that they could undergo a conformational change; this will be confirmed by NMR. Also their immunogenicity will be checked by mice immunization. In addition, we find that cholesterol could change the orientation of peptides encompassing a gp41 CRAC motif.</dcterms:abstract>
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