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<dc:title xml:lang="fr">Découverte et caractérisation d'une nouvelle forme de méthionyl-ARNt synthétase nucléaire chez la levure Saccharomyces cerevisiae</dc:title>
<dcterms:alternative xml:lang="en">Discovery and characterization of a new methionyl-tRNA synthetase in Saccharomyces cerevisiae</dcterms:alternative>
<dc:subject xml:lang="fr">Aminoacyl-ARNt synthétase</dc:subject>
<dc:subject xml:lang="fr">ARNt</dc:subject>
<dc:subject xml:lang="fr">Noyau</dc:subject>
<dc:subject xml:lang="fr">Saccharomyces cerevisiae</dc:subject>
<dc:subject xml:lang="fr">Transition diauxique</dc:subject>
<dc:subject xml:lang="fr">Transcription</dc:subject>
<dc:subject xml:lang="fr">Clivage</dc:subject>
<dc:subject xml:lang="en">Aminoacyl-tRNA synthetase</dc:subject>
<dc:subject xml:lang="en">TRNA</dc:subject>
<dc:subject xml:lang="en">Nucleus</dc:subject>
<dc:subject xml:lang="en">Saccharomyces cerevisiae</dc:subject>
<dc:subject xml:lang="en">Diauxic shift</dc:subject>
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<tef:elementdEntree autoriteExterne="031445551" autoriteSource="Sudoc">ARN de transfert</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="033442207" autoriteSource="Sudoc">Aminoacyl-ARNt synthétases</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La methionyl-ARNt synthétase (MetRS) de Saccharomyces cerevisiae aminoacyle les ARNt méthionine initiateur et élongateur (ARNtiMet et ARNteMet), mais possède également des fonctions atypiques. Nous avons montré que la MetRS rejoint le noyau durant la transition diauxique afin de réguler la transcription des gènes nucléaires des complexes III et V de la chaîne respiratoire mitochondriale. Pour ce faire, la MetRS possède au moins deux signaux de localisation nucléaire (NLS) dans sa séquence, l’un se situant dans les 55 premiers acides aminés (aa) et le second, au delà de la partie N-terminale lui permettant de recruter les sous-unités Rpb4 et Rpb7 de l’ARN pol II. Nous avons montré qu’en fermentation, la MetRS est clivée entre le 114ème et le 132ème aa et que cette forme clivée est essentielle à la viabilité des cellules, puisqu’un variant non clivé (MetRSK11A) ne permet pas la croissance. Nous avons surproduit et purifié un mutant de la MetRS clivée (MetRSΔ142) et montré que ce variant est plus efficace pour l’aminoacylation de l’ARNtiMet que la forme entière de MetRS. Ainsi, notre étude suggère que chez S. cerevisiae, la forme longue de MetRS cytoplasmique permet l’aminoacylation de l’ARNteMet, la forme longue de MetRS nucléaire régule la transcription, et la forme clivée de MetRS nucléaire et cytoplasmique permet l’aminoacylation de l’ARNtiMet</dcterms:abstract>
<dcterms:abstract xml:lang="en">Methionyl-tRNA synthetase (MetRS) is the enzyme in charge of aminocylation of tRNA methionine initiator and elongator (tRNAiMet et tRNAeMet), but also displays atypical functions in Saccharomyces cerevisiae. In the present work, we showed that MetRS is imported to the nucleus during the diauxic shift in order to regulate transcription of genes coding for the complexes III and V subunits of the mitochondrial respiratory chain. To do so, MetRS harbors at least two nuclear localization signals (NLS), located within the 55 first aminoacids (NLS1) and beyond the N-terminal part (NLS2). The N- terminal part is responsible for the recruitment of RNA pol II subunits Rpb4 and Rpb7. We also showed that MetRS is cleaved through the 114th and the 132nd aminoacid during fermentation and that the proteolysed form is essential for the viability of the cell, since a mutant of MetRS which is not cleaved (MetRSK11A) did not allows the growth. We showed that an overproduced and purified a mutant representative of the cleaved form (MetRSΔ142) is more efficient for tRNAiMet aminoacylation than the full length MetRS. Thus, our study suggests that in S. cerevisiae, the cytoplasmic full length MetRS aminoacylates tRNAeMet, the nuclear full length MetRS regulates genes transcription, and the cytoplasmic and nuclear cleaved MetRS aminoacylates the tRNAiMet.</dcterms:abstract>
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