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RNA. Mar 1999; 5(3): 455–467.
PMCID: PMC1369773

Nop58p is a common component of the box C+D snoRNPs that is required for snoRNA stability.

Abstract

Eukaryotic nucleoli contain a large family of box C+D small nucleolar RNA (snoRNA) species, all of which are associated with a common protein Nop1p/fibrillarin. Nop58p was identified in a screen for synthetic lethality with Nop1p and shown to be an essential nucleolar protein. Here we report that a Protein A-tagged version of Nop58p coprecipitates all tested box C+D snoRNAs and that genetic depletion of Nop58p leads to the loss of all tested box C+D snoRNAs. The box H+ACA class of snoRNAs are not coprecipitated with Nop58p, and are not codepleted. The yeast box C+D snoRNAs include two species, U3 and U14, that are required for the early cleavages in pre-rRNA processing. Consistent with this, Nop58p depletion leads to a strong inhibition of pre-rRNA processing and 18S rRNA synthesis. Unexpectedly, depletion of Nop58p leads to the accumulation of 3' extended forms of U3 and U24, showing that the protein is also involved in snoRNA synthesis. Nop58p is the second common component of the box C+D snoRNPs to be identified and the first to be shown to be required for the stability and for the synthesis of these snoRNAs.

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Selected References

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