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<dc:title xml:lang="fr">Interaction des segments d’ARN génomique du virus Influenza A avec la nucléoprotéine virale NP : impact structural et implications pour l’encapsidation du génome</dc:title>
<dcterms:alternative xml:lang="en">Interaction of Influenza A genomic RNA segments with the viral nucleoprotein NP : structural impact and implications for genome packaging</dcterms:alternative>
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<dc:subject xml:lang="fr">SHAPE</dc:subject>
<dc:subject xml:lang="fr">Structure</dc:subject>
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<dc:subject xml:lang="en">RNA</dc:subject>
<dc:subject xml:lang="en">Chemical probing</dc:subject>
<dc:subject xml:lang="en">Influenza</dc:subject>
<dc:subject xml:lang="en">SHAPE</dc:subject>
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<dcterms:abstract xml:lang="fr">Les virus Influenza A possèdent un génome segmenté en 8 ARN génomiques, impliqués dans des épidémies saisonnières et des pandémies occasionnelles. La complexité de leur génome requiert un mécanisme afin d’empaqueter un exemplaire de chaque ARN viral, afin d’obtenir des particules virales infectieuses. L’empaquetage sélectif de ces ARN est régi par des interactions entre des signaux d’empaquetage présents sur les ARN génomiques. Leur accessibilité est régulée par la structure de l’ARN. Nous avons cherché à caractériser la liaison de la protéine NP à l’ARN, ainsi que l’impact de cette liaison sur la structure de l’ARN. A l’aide de techniques de cartographique chimique, nous avons montré que la NP ne reconnaissait pas de séquence spécifique et identifié de potentiels sites de fixation. Nous avons pu démontrer que l’étude de la structure de l’ARN permet d’identifier des signaux d’empaquetage ainsi que les interactions entre deux segments complexés modifient la structure de ces segments.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Influenza A viruses have a segmented genome of 8 genomic RNAs, involved in seasonal epidemics and occasional pandemics. The complexity of their genome requires a mechanism to package one copy of each viral RNA into infectious virus particles.The selective packaging of these RNAs is governed by interactions between packaging signals on the genomic RNAs. Their accessibility is regulated by the structure of the RNA.We sought to characterize the binding of the NP protein to RNA, and the impact of this binding on RNA structure. Using chemical probing techniques, we showed that the NP does not recognize a specific sequence and identified potential binding sites. We were able to demonstrate that the study of the RNA structure allows the identification of packaging signals and that interactions between two complexed segments modify the structure of these segments.</dcterms:abstract>
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