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Structural and functional analysis of 5S rRNA in Saccharomyces cerevisiae

Kiparisov, S., Petrov, A., Meskauskas, A., Sergiev, P.V., Dontsova, O.A., Dinman, J.D.
Molecular genetics and genomics 2005 v.274 no.3 pp. 235-247
Saccharomyces cerevisiae, ribosomal RNA, alleles, ribosomes, phenotype, mutants, frameshift mutation, bioinformatics, nucleotide sequences
5S rRNA extends from the central protuberance of the large ribosomal subunit, through the A-site finger, and down to the GTPase-associated center. Here, we present a structure-function analysis of seven 5S rRNA alleles which are sufficient for viability in the yeast Saccharomyces cerevisiae when expressed in the absence of wild-type 5S rRNAs, and extend this analysis using a large bank of mutant alleles that show semi-dominant phenotypes in the presence of wild-type 5S rRNA. This analysis supports the hypothesis that 5S rRNA serves to link together several different functional centers of the ribosome. Data are also presented which suggest that in eukaryotic genomes selection has favored the maintenance of multiple alleles of 5S rRNA, and that these may provide cells with a mechanism to post-transcriptionally regulate gene expression.