Reference: Fatica A, et al. (2003) Cic1p/Nsa3p is required for synthesis and nuclear export of 60S ribosomal subunits. RNA 9(12):1431-6

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Abstract


Cic1p/Nsa3p was previously reported to be associated with the 26S proteasome and required for the degradation of specific substrates, but was also shown to be associated with early pre-60S particles and to be localized to the nucleolus. Here we report that Cic1p/Nsa3p is required for the synthesis of 60S ribosome subunits. A temperature-sensitive lethal cic1-2 point mutation inhibits synthesis of the mature 5.8S and 25S rRNAs. Release of the pre-60S particles from the nucleolus to the nucleoplasm was also inhibited as judged by the nuclear accumulation of an Rpl11b-GFP reporter construct. We suggest that Cic1p/Nsa3p associates early with nascent preribosomal particles and is required for correct processing and nuclear release of large ribosomal subunit precursors.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Fatica A, Oeffinger M, Tollervey D, Bozzoni I
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