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<dc:title xml:lang="fr">Rôle de la protéine p14 du BNYVV et de l'ARN-3 viral dans la suppression de l'interférence par l'ARN et le mouvement à longue distance</dc:title>
<dcterms:alternative xml:lang="en">Role of the BNYVV-p14 protein and the viral RNA-3 in the RNA silencing suppression and the long distance movement</dcterms:alternative>
<dc:subject xml:lang="fr">ARN non codant viral</dc:subject>
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<dc:subject xml:lang="fr">BNYVV</dc:subject>
<dc:subject xml:lang="fr">RNA silencing</dc:subject>
<dc:subject xml:lang="fr">Mouvement systémique</dc:subject>
<dc:subject xml:lang="en">Viral noncoding RNA</dc:subject>
<dc:subject xml:lang="en">Exoribonucleases</dc:subject>
<dc:subject xml:lang="en">BNYVV</dc:subject>
<dc:subject xml:lang="en">RNA silencing</dc:subject>
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<tef:elementdEntree autoriteExterne="091514886" autoriteSource="Sudoc">Protéine p14 TCL1</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le beet necrotic yellow vein virus (BNYVV) est un phytovirus qui possède un génome segmenté à ARN de polarité positive. L’ARN3 viral renferme le domaine « core » qui contient une séquence de 20 nucléotides appelée « coremin », indispensable au mouvement systémique du virus chez Beta macrocarpa. L’ARN3 subit un processus de dégradation qui conduit à la formation d’un ARN non codant (ncRNA3) correspondant à son extrémité 3’. Ce dernier est stabilisé par la séquence « coremin » à son extrémité 5’. Grâce à l’outil génétique levure, l’exoribonucléase Xrn1 puis l’exoribonucléase XRN4 de plante ont été identifiées comme étant responsable de l’accumulation du ncRNA3 à partir d’ARN3. Nous avons démontré in vitro que l’accumulation de ncRNA3 est liée au blocage de Xrn1 par « coremin ». La protéine virale p14, un suppresseur du RNA silencing codée par l’ARN2, est aussi nécessaire au mouvement systémique du virus et interagit avec la séquence « coremin ». Nos travaux confirment que l’ARN3 est capable de complémenter partiellement un mutant allélique de p14 dans l’infection locale et systémique. Nos résultats mettent en évidence un effet de la protéine p14 sur la systémie du RNA silencing et sur une éventuelle cible cellulaire RDR6.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The beet necrotic yellow vein virus (BNYVV) is a multipartite positive-stranded RNA phytovirus. The RNA3 contains a « core » sequence in which resides the « coremin » motif of 20 nucleotides absolutely required for the viral systemic movement in Beta macrocarpa. The RNA3 undergoes a process that produces a noncoding RNA3 (ncRNA3), stabilized by « coremin » at its 5’ end. Using a yeast genetic approach, the exoribonuclease Xrn1 and plant XRN4 have been identified as being responsible for the ncRNA3 accumulation from RNA3 processing. In vitro, we showed that the ncRNA3 accumulation is due to the stalling of Xrn1 by “coremin”. The viral p14 protein, an RNA silencing suppressor encoded by the RNA2, is also required for the systemic movement and interacts with the “coremin” sequence. Our studies demonstrated the ability of RNA3 to partially complement an allelic p14 mutant in local and systemic infections. Our data highlighted an effect of the p14 protein on the RNA silencing movement and on the potential cellular target RDR6.</dcterms:abstract>
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