Saccharomyces cerevisiae Sof1p associates with 35S Pre-rRNA independent from U3 snoRNA and Rrp5p

Eukaryotic Cell
Ralph BaxJan C Vos

Abstract

Sof1p is a trans-acting protein that is essential for biogenesis of the 40S ribosomal subunits in the yeast Saccharomyces cerevisiae. Because of its involvement in the early cleavage steps of precursor rRNA, its interaction with Nop1p and its ability to coprecipitate U3 snoRNA, Sof1p has so far been regarded as a protein that is specific to the U3 snoRNP. To determine whether a site exists within U3 snoRNA with which Sof1p directly or indirectly associates, we studied the ability of ProtA-tagged Sof1p to coimmunoprecipitate mutant versions of U3 snoRNA. None of the tested mutations had a significant effect on the recovery of mutant U3 from cell extracts. Further coimmunoprecipitation experiments, using cells that could be genetically depleted for either Sof1p or U3 snoRNA demonstrated that the two factors associate independently of each other with the 35S precursor RNA. Indeed, association between Sof1p and U3 snoRNA was abolished in cells in which 35S pre-rRNA transcription was blocked. Finally, we found that an overall reduction in the levels of box C/D snoRNPs by genetic depletion of the common Nop58p protein did not affect coprecipitation of 35S pre-rRNA by Sof1p. From these data, we conclude that Sof1p does not assemble in...Continue Reading

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Citations

Apr 24, 2014·Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire·Kouko WadaTsuneyoshi Horigome

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