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© Research
Publication : The EMBO journal

The ribosomal protein Rps15p is required for nuclear exit of the 40S subunit precursors in yeast

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The EMBO journal - 27 May 2004

Léger-Silvestre I, Milkereit P, Ferreira-Cerca S, Saveanu C, Rousselle JC, Choesmel V, Guinefoleau C, Gas N, Gleizes PE

Link to Pubmed [PMID] – 15167894

EMBO J. 2004 Jun;23(12):2336-47

We have conducted a genetic screen in order to identify ribosomal proteins of Saccharomyces cerevisiae involved in nuclear export of the small subunit precursors. This has led us to distinguish Rps15p as a protein dispensable for maturation of the pre-40S particles, but whose assembly into the pre-ribosomes is a prerequisite to their nuclear exit. Upon depletion of Rps15p, 20S pre-rRNA is released from the nucleolus and retained in the nucleus, without alteration of the pre-rRNA early cleavages. In contrast, Rps18p, which contacts Rps15p in the small subunit, is required upstream for pre-rRNA processing at site A2. Most pre-40S specific factors are correctly associated with the intermediate particles accumulating in the nucleus upon Rps15p depletion, except the late-binding proteins Tsr1p and Rio2p. Here we show that these two proteins are dispensable for nuclear exit; instead, they participate in 20S pre-rRNA processing in the cytoplasm. We conclude that, during the final maturation steps in the nucleus, incorporation of the ribosomal protein Rps15p is specifically required to render the pre-40S particles competent for translocation to the cytoplasm.

http://www.ncbi.nlm.nih.gov/pubmed/15167894