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<dc:title xml:lang="en">Structural rearrangements of the HIV-1 genomic RNA during maturation of the viral particle</dc:title>
<dcterms:alternative xml:lang="fr">Etude des remaniements structuraux de l'ARN génomique du VIH-1 lors de la maturation des particules virales</dcterms:alternative>
<dc:subject xml:lang="fr">VIH-1</dc:subject>
<dc:subject xml:lang="fr">Maturation protéique</dc:subject>
<dc:subject xml:lang="fr">Maturation génomique</dc:subject>
<dc:subject xml:lang="fr">Cartographie chimique de l’ARN</dc:subject>
<dc:subject xml:lang="fr">Séquençage à haut débit</dc:subject>
<dc:subject xml:lang="fr">Structure secondaire de l’ARN</dc:subject>
<dc:subject xml:lang="fr">Activité chaperonne de l’ARN</dc:subject>
<dc:subject xml:lang="en">HIV-1</dc:subject>
<dc:subject xml:lang="en">Proteolytic processing</dc:subject>
<dc:subject xml:lang="en">Genomic maturation</dc:subject>
<dc:subject xml:lang="en">RNA chemical probing</dc:subject>
<dc:subject xml:lang="en">High-throughput sequencing</dc:subject>
<dc:subject xml:lang="en">RNA secondary structure</dc:subject>
<dc:subject xml:lang="en">RNA chaperone activity</dc:subject>
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<tef:elementdEntree autoriteExterne="031349323" autoriteSource="Sudoc">Épissage (génétique)</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="145354539" autoriteSource="Sudoc">Génomique</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="03409220X" autoriteSource="Sudoc">ARN viral</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="034111964" autoriteSource="Sudoc">Molécules chaperonnes</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le VIH-1 bourgeonne sous forme immature et doit subir l’étape de maturation afin d’acquérir son caractère infectieux. La maturation protéolytique du précurseur Pr55Gag induit le réarrangement morphologique de la particule alors que le dimère d’ARNg acquiert une compaction optimale. Ces réarrangements conformationnels restent encore inconnus et sont facilités par l’activité chaperonne de la protéine NCp7. Notre but a été de déterminer les différentes étapes menant à l’obtention d’un dimère d’ARNg mature. Nous avons donc étudié la structure des 550 premiers nucléotides du génome par cartographie chimique, à la fois 1. in vitro en présence des protéines Pr55Gag, GagΔp6, intermédiaires contenant le domaine NC et NCp7 et 2. in viro par l’approche hSHAPE-Seq que nous avons développé. Les particules matures et bloquées aux différentes étapes de maturation de Pr55Gag ont été analysées ainsi que des particules matures et totalement immatures traitées avec l’éjecteur de zinc AT-2. Ce traitement permet d’identifier les sites de protection de Pr55Gag et NCp7 ainsi que leur activité déstabilisatrice.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The HIV-1 particle buds from the infected cell as an immature particle and has to undergo a maturation process to become infectious. Proteolytic processing of Pr55Gag triggers morphological rearrangements of the particle whereas the gRNA dimer becomes more stable. Genomic rearrangements remain poorly understood and are facilitated by the RNA chaperone activity of the NCp7 protein. Our goal was to determining the different steps leading to the formation of the mature dimeric gRNA. To this end, the structure of the first 550 nucleotides of the HIV-1 genome was assessed by chemical probing 1. in vitro with Pr55Gag, GagΔp6, NC-containing intermediates and NCp7 proteins and 2. in viro with the hSHAPE-Seq approach we developed. Wild type and mutant viruses mimicking the sequential processing of Pr55Gag were analysed, as well as immature PR- and mature particles treated with the AT-2 zinc ejector, in order to identify the Pr55Gag and NCp7 binding sites and their gRNA destabilising activity.</dcterms:abstract>
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