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Pubmed ID :9582370
Publication Date : //

Rrp6p, the yeast homologue of the human PM-Scl 100-kDa autoantigen, is essential for efficient 5.8 S rRNA 3' end formation.


The eukaryotic 25 S, 18 S, and 5.8 S rRNAs are synthesized as a single transcript with two internal transcribed spacers (ITS1 and ITS2), which are removed by endo- and exoribonucleolytic steps to produce mature rRNA. Genetic selection for suppressors of a polyadenylation defect yielded two cold-sensitive alleles of a gene that we named RRP6 (ribosomal RNA processing). Molecular cloning of RRP6 revealed its homology to a 100-kDa human, nucleolar PM-Scl autoantigen and to Escherichia coli RNase D, a 3'-5' exoribonuclease. Recessive mutations in rrp6 result in the accumulation of a novel 5. 8 S rRNA processing intermediate, called 5.8 S*, which has normal 5' ends, but retains approximately 30 nucleotides of ITS2. Pulse-chase analysis of 5.8 S rRNA processing in an rrp6- strain revealed a precursor-product relationship between 5.8 S* and 5.8 S rRNAs, suggesting that Rrp6p plays a role in the removal of the last 30 nucleotides of ITS2 from 5.8 S precursors. A portion of 5.8 S* rRNA assembles into 60 S ribosomes which form polyribosomes, suggesting that they function in protein synthesis. These findings indicate that Rrp6p plays a role in 5.8 S rRNA 3' end formation, and they identify a functional intermediate in the rRNA processing pathway.

Authors : Briggs M W , Burkard K T , Butler J S ,

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