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RNA. 2003 Dec;9(12):1431-6.

Cic1p/Nsa3p is required for synthesis and nuclear export of 60S ribosomal subunits.

Author information

1
Department of Genetics and Molecular Biology, University of Rome "La Sapienza," Rome, Italy. alessandro.fatica@uniroma1.it

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.

PMID:
14623999
PMCID:
PMC1370497
DOI:
10.1261/rna.5130503
[Indexed for MEDLINE]
Free PMC Article

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