PMID: 2116418Aug 1, 1990Paper

The yeast RNA1 gene product necessary for RNA processing is located in the cytosol and apparently excluded from the nucleus

The Journal of Cell Biology
A K HopperR W Dunst

Abstract

The yeast RNA1 gene is required for RNA processing and nuclear transport of RNA. The rna1-1 mutation of this locus causes defects in pre-tRNA splicing, processing of the primary pre-rRNA transcript, production of mRNA and export of RNA from the nucleus to the cytosol. To understand how this gene product can pleiotropically affect these processes, we sought to determine the intracellular location of the RNA1 protein. As determined by indirect immunofluorescence localization and organelle fractionation, the RNA1 antigen is found exclusively or primarily in the cytoplasm. Only a tiny fraction of the endogenous protein could be localized to and functional in the nucleus. Furthermore, the RNA1 antigen does not localize differently under stress conditions. These findings suggest that the RNA1 protein is not directly involved in RNA processing but may modify nuclear proteins or otherwise transmit a signal from the cytosol to the nucleus or play a role in maintaining the integrity of the nucleus.

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