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• W1987327896 abstract "All large rRNAs possess a common core of secondary structure. However, large variations in the size of the molecule have arisen during evolution, which are accomodated over a dozen rapidly evolving domains. Most of the enlargement of the eukaryotic molecules (as compared to prokaryotes) is in fact restricted over only two of these divergent domains, which are dramatically expanded in vertebrates. We have derived secondary structure models for these two domains through a systematic comparison of all the pro- and eukaryotic sequences published so far. Within each of these domains, a subset of secondary structure elements which are specific to eukaryotes is detected. Archaebacterial-specific secondary structures can also be identified which appear to be maintained through a strong selective constraint. The relative preservation of such group-specific structures raises the issue of their potential involvement in some diversification of ribosomal functions among the three fundamental phylogenetic groups, eubacteria, archaebacteria and eukaryotes. We also show that eukaryotic ribosomal RNAs are subjected, over their entire length, to a unique type of compositional constraint which may largely differ among the major eukaryotic taxa. Tous les rARNs de la grande sous-unité ribosomique ont en commun un large cœur de structure secondaire. Cependant, la taille de la molécule a varié dans des proportions assez importantes au cours de l'évolution, ces variations se localisant au niveau d'une douzaine de domaines à évolution relativement rapide. La majeure partie de l'allongement des molécules eucaryotiques (par rapport aux procaryotes) se situe en fait sur seulement deux de ces domaines, dont l'expansion est particulièrement spectaculaire chez les vertébrés. A partir d'un examen systématique de toutes les séquences disponibles (pro- et eucaryotiques), nous avons pu déduire des modèles de structure secondaire pour ces deux domaines. Dans chacun d'eux, un certain nombre d'éléments de structure secondaire spécifiques des archéobactéries peuvent aussi être identifiés, qui apparaissent soumis à une forte contrainte sélective. La relative préservation de telles structures spécifiques de groupes amène à poser le problème de leur intervention éventuelle dans une diversification de la fonction ribosomique entre les trois groupes phylogénétiques fondamentaux, eubactéries, archébactéries et eucaryotes. Cette étude montre aussi que les rARNs eucaryotiques sont soumis, sur toute leur longueur, à un type unique de contrainte sur la composition en base, qui peut différer considérablement entre les grands groupes eucaryotiques." @default.
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• W1987327896 date "1987-01-01" @default.
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• W1987327896 title "Comparisons of large subunit rRNAs reveal some eukaryote-specific elements of secondary structure" @default.
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• W1987327896 doi "https://doi.org/10.1016/0300-9084(87)90267-7" @default.
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