Reference: Carneiro T, et al. (2008) Inactivation of cleavage factor I components rna14p and rna15p induces sequestration of small nucleolar ribonucleoproteins at discrete sites in the nucleus. Mol Biol Cell 19(4):1499-508

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Abstract

Monitoring Editor: A. Gregory Matera Small nucleolar RNAs (snoRNAs) associate with specific proteins forming small nucleolar ribonucleoprotein (snoRNP) particles, which are essential for ribosome biogenesis. The snoRNAs are transcribed, processed and assembled in snoRNPs in the nucleoplasm. Mature particles are then transported to the nucleolus. In yeast, 3'-end maturation of snoRNAs involves the activity of Rnt1p endonuclease and cleavage factor IA (CFIA). We report that following inhibition of CFIA components Rna14p and Rna15p, the snoRNP proteins Nop1p, Nop58p and Gar1p delocalise from the nucleolus and accumulate in discrete nucleoplasmic foci. The U14 snoRNA, but not U3 snoRNA, similarly redistributes from the nucleolus to the nucleoplasmic foci. Simultaneous depletion of either Rna14p or Rna15p and the nuclear exosome component Rrp6p induces accumulation of poly(A)(+) RNA at the snoRNP-containing foci. We propose that the foci detected after CFIA inactivation correspond to quality control centers in the nucleoplasm.

Reference Type
Journal Article
Authors
Carneiro T, Carvalho C, Braga J, Rino J, Milligan L, Tollervey D, Carmo-Fonseca M
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