Girke, Philipp and Seufert, Wolfgang (2019) Compositional reorganization of the nucleolus in budding yeast mitosis. MOLECULAR BIOLOGY OF THE CELL, 30 (5). pp. 591-606. ISSN 1059-1524, 1939-4586
Full text not available from this repository. (Request a copy)Abstract
The nucleolus is a membraneless organelle of the nucleus and the site of rRNA synthesis, maturation, and assembly into preribosomal particles. The nucleolus, organized around arrays of rRNA genes (rDNA), dissolves during prophase of mitosis in metazoans, when rDNA transcription ceases, and reforms in telophase, when rDNA transcription resumes. No such dissolution and reformation cycle exists in budding yeast, and the precise course of nucleolar segregation remains unclear. By quantitative live-cell imaging, we observed that the yeast nucleolus is reorganized in its protein composition during mitosis. Daughter cells received equal shares of preinitiation factors, which bind the RNA polymerase I promoter and the rDNA binding barrier protein Fob1, but only about one-third of RNA polymerase I and the processing factors Nop56 and Nsr1. The distribution bias was diminished in nonpolar chromosome segregation events observable in dyn1 mutants. Unequal distribution, however, was enhanced by defects in RNA polymerase I, suggesting that rDNA transcription supports nucleolar segregation. Indeed, quantification of pre-rRNA levels indicated ongoing rDNA transcription in yeast mitosis. These data, together with photobleaching experiments to measure nucleolar protein dynamics in anaphase, consolidate a model that explains the differential partitioning of nucleolar components in budding yeast mitosis.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | RNA-POLYMERASE-I; SACCHAROMYCES-CEREVISIAE; CDC14 PHOSPHATASE; SYNTHETIC NUCLEOLI; ORGANIZER REGIONS; SPINDLE DYNAMICS; TRANSCRIPTION; PROTEIN; RDNA; SEGREGATION; |
| Subjects: | 500 Science > 570 Life sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Biochemie, Genetik und Mikrobiologie Biology, Preclinical Medicine > Institut für Biochemie, Genetik und Mikrobiologie > Cell Cycle Control Biology, Preclinical Medicine > Institut für Biochemie, Genetik und Mikrobiologie > Cell Cycle Control > Prof. Dr. Wolfgang Seufert |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Apr 2020 07:07 |
| Last Modified: | 16 Apr 2020 07:07 |
| URI: | https://pred.uni-regensburg.de/id/eprint/27435 |
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