Reference: Faber AW, et al. (2006) 5'-end formation of yeast 5.8SL rRNA is an endonucleolytic event. Biochem Biophys Res Commun 345(2):796-802

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Abstract


Like most eukaryotes, Saccharomyces cerevisiae cells contain a minor 5.8SL rRNA that, relative to the major 5.8SS species, carries several extra nucleotides at the 5'-end. The two species are produced by alternative pathways that differ in the events removing the 3'-terminal region of Internal Transcribed Spacer 1 from the 27SA2 pre-rRNA. Whereas the pathway leading to 5.8SS rRNA is well established, that producing the 5'-end of 5.8SL (called B1L) is poorly understood. Northern analysis of two different mutants of S. cerevisiae that overproduce 5.8SL rRNA revealed the presence of a fragment corresponding to the 3'-terminal region of Internal Transcribed Spacer 1 (ITS1) directly upstream from site B1L. Immunoprecipitation experiments showed this fragment to be associated with the trans-acting factor Rrp5p required for processing at the early sites A0-A3. Together these data clearly support that the 5'-end of 5.8SL rRNA is an endonucleolytic event. In vivo mutational analysis demonstrated the lack of any cis-acting sequence elements directing this cleavage within ITS1.

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Journal Article
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Faber AW, Vos HR, Vos JC, Raué HA
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