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<dc:subject xml:lang="fr">Aminoacyl-ARNt synthétases</dc:subject>
<dc:subject xml:lang="fr">Complexes MARS</dc:subject>
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<dc:subject xml:lang="en">Aminoacyl-tRNA synthetases</dc:subject>
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<tef:elementdEntree autoriteExterne="033442207" autoriteSource="Sudoc">Aminoacyl-ARNt synthétases</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Plasmodium est le parasite qui cause le paludisme. L’équipe a mis en évidence, in vitro, l’import d’ARNt exogène et a identifié un transporteur potentiel : la protéine tRip (tRNA import protein). In vitro, tRip lie tous les ARNt en reconnaissant leur structure. In vivo, tRip est une protéine transmembranaire et son domaine de liaison aux ARNt est exposé à l’extérieur du parasite. tRip n’est pas essentielle, mais la multiplication du parasite KO est significativement ralentie. En plus de son rôle dans l’import d’ARNt, tRip interagit avec 3 aminoacyl-ARNt synthétases : la glutamyl- (ERS), la glutaminyl- (QRS) et la methionyl-ARNt synthétase (MRS), suggérant que tRip permet l’organisation d’un complexe multi synthétasique (MARS) localisé à la membrane. J’ai pu montrer que l’assemblage du complexe est effectué par des domaines GST N-terminales présents dans les 4 partenaires. J’ai identifié, reconstitué et caractérisé 2 complexes distincts : complexe Q (tRip:ERS:QRS) et complexe M (tRip:ERS:MRS). La résolution de la structure cristallographique du GST de l’ERS ainsi que des tests de mutagenèse dirigée m’a permis de proposer des modèles des complexes MARS.</dcterms:abstract>
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