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<dc:title xml:lang="fr">Détermination du mode d'action et des substrats de RNases P protéiques chez Arabidopsis thaliana</dc:title>
<dcterms:alternative xml:lang="en">Determination of the mode of action and substrates of protein only RNase P in Arabidopsis thaliana</dcterms:alternative>
<dc:subject xml:lang="fr">RNase P</dc:subject>
<dc:subject xml:lang="fr">ARNt</dc:subject>
<dc:subject xml:lang="fr">Maturation de l’ARN</dc:subject>
<dc:subject xml:lang="fr">Biophysique</dc:subject>
<dc:subject xml:lang="fr">Interactions protéines-ARN</dc:subject>
<dc:subject xml:lang="fr">PPR</dc:subject>
<dc:subject xml:lang="fr">Plantes</dc:subject>
<dc:subject xml:lang="en">RNase P</dc:subject>
<dc:subject xml:lang="en">TRNA</dc:subject>
<dc:subject xml:lang="en">RNA maturation</dc:subject>
<dc:subject xml:lang="en">Biophysics</dc:subject>
<dc:subject xml:lang="en">Protein-RNA interactions</dc:subject>
<dc:subject xml:lang="en">PPR</dc:subject>
<dc:subject xml:lang="en">Plants</dc:subject>
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<tef:elementdEntree autoriteExterne="035143665" autoriteSource="Sudoc">Ribonucléases</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="033872538" autoriteSource="Sudoc">Interactions ARN-protéine</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="031277306" autoriteSource="Sudoc">Plantes -- Génétique moléculaire</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="031445551" autoriteSource="Sudoc">ARN de transfert</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="033611416" autoriteSource="Sudoc">Arabidopsis thaliana</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="092712819" autoriteSource="Sudoc.FMesh">Ribonuclease P</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L’activité RNase P est l'activité essentielle qui élimine les séquences 5' supplémentaires des précurseurs d'ARN de transfert. "PRORP" (PROteinaceous RNase P) définit une nouvelle catégorie de RNase P uniquement protéique. Avant la caractérisation de PRORP, on pensait que les enzymes RNase P étaient universellement conservées sous forme de ribonucléoprotéines (RNP). La caractérisation de PRORP a révélé une enzyme avec deux domaines principaux, un domaine N-terminal contenant plusieurs motifs PPR et un domaine NYN C-terminal portant l’activité catalytique. Nous avons utilisé une combinaison d'approches biochimiques et biophysiques pour caractériser le complexe PRORP / ARNt. La structure du complexe en solution a été déterminée par diffusion des rayons X aux petits angles (SAXS) et les Kd des interactions de différents mutants de PRORP avec l’ARNt ont été déterminées par ultracentrifugation analytique. Notre analyse révèle un cas intéressant d'évolution convergente. Il suggère que PRORP a développé un processus de reconnaissance de l'ARN similaire à celui des RNase P RNP. Par ailleurs, nous avons mis en place une approche de co-immunoprécipitation de PRORP avec l’ARN afin de définir le spectre de substrats des RNase P protéiques.</dcterms:abstract>
<dcterms:abstract xml:lang="en">RNase P is the essential activity that removes 5'-leader sequences from transfer RNA precursors. “PRORP” (PROteinaceous RNase P) defines a novel category of protein only RNase P. Before the characterization of PRORP, RNase P enzymes were thought to occur universally as ribonucleoproteins (RNP). The characterization of PRORP revealed an enzyme with two main domains, an N-terminal domain containing multiple PPR motifs and a C-terminal NYN domain holding catalytic activity. We used a combination of biochemical and biophysical approaches to characterize the PRORP / tRNA complex. The structure of the complex in solution was determined by small angle X-ray scattering and Kd values of the PRORP / tRNA interaction were determined by analytical ultracentrifugation. We also analyzed direct interaction of a collection of PPR mutants with tRNA in order to determine the relative importance of individual PPR motifs for RNA binding. This reveals to what extent PRORP target recognition process conforms to the mode of action of PPR proteins interacting with linear RNA. Altogether, our analysis reveals an interesting case of convergent evolution. It suggests that PRORP has evolved an RNA recognition process similar to that of RNP RNase P. Moreover, we also implemented a PRORP-RNA co-immunoprecipitation approach to determine the full extent of PRORP substrates.</dcterms:abstract>
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