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. 1990 Jul;10(7):3524–3534. doi: 10.1128/mcb.10.7.3524

Differential distribution of factors involved in pre-mRNA processing in the yeast cell nucleus.

J A Potashkin 1, R J Derby 1, D L Spector 1
PMCID: PMC360787  PMID: 2192258

Abstract

The yeast cell nucleus has previously been shown to be divided into two regions by a variety of microscopic approaches. We used antibodies specific for the 2,2,7-trimethylguanosine cap structure of small nuclear ribonucleic acids (snRNAs) and for a protein component of small nuclear ribonucleoprotein particles to identify the distribution of small nuclear ribonucleoprotein particles within the yeast cell nucleus. These studies were performed with the fission yeast Schizosaccharomyces pombe and the budding yeast Saccharomyces cerevisiae. By using immunofluorescence microscopy and immunoelectron microscopy, most of the abundant snRNAs were localized to the portion of the nucleus which has heretofore been referred to as the nucleolus. This distribution of snRNAs is different from that found in mammalian cells and suggests that the nucleolar portion of the yeast nucleus contains functional domains in addition to those associated with RNA polymerase I activity.

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