Reference - Detail
| RRC ID | 70428 |
|---|---|
| Author | Pickering M, Magner M, Keifenheim D, Rhind N. |
| Title | The fission yeast S-phase cyclin Cig2 can drive mitosis. |
| Journal | Genetics |
| Abstract |
Commitment to mitosis is regulated by cyclin-dependent kinase (CDK) activity. In the fission yeast Schizosaccharomyces pombe, the major B-type cyclin, Cdc13, is necessary and sufficient to drive mitotic entry. Furthermore, Cdc13 is also sufficient to drive S phase, demonstrating that a single cyclin can regulate alternating rounds of replication and mitosis, and providing the foundation of the quantitative model of CDK function. It has been assumed that Cig2, a B-type cyclin expressed only during S phase and incapable of driving mitosis in wild-type cells, was specialized for S-phase regulation. Here, we show that Cig2 is capable of driving mitosis. Cig2/CDK activity drives mitotic catastrophe-lethal mitosis in inviably small cells-in cells that lack CDK inhibition by tyrosine-phosphorylation. Moreover, Cig2/CDK can drive mitosis in the absence of Cdc13/CDK activity and constitutive expression of Cig2 can rescue loss of Cdc13 activity. These results demonstrate that in fission yeast, not only can the presumptive M-phase cyclin drive S phase, but the presumptive S-phase cyclin can drive M phase, further supporting the quantitative model of CDK function. Furthermore, these results provide an explanation, previously proposed on the basis of computational analyses, for the surprising observation that cells expressing a single-chain Cdc13-Cdc2 CDK do not require Y15 phosphorylation for viability. Their viability is due to the fact that in such cells, which lack Cig2/CDK complexes, Cdc13/CDK activity is unable to drive mitotic catastrophe. |
| Volume | 217(1) |
| Pages | 1-12 |
| Published | 2021-3-3 |
| DOI | 10.1093/genetics/iyaa002 |
| PII | 5974038 |
| PMID | 33683349 |
| PMC | PMC8045716 |
| MeSH | Cyclin B / genetics Cyclin B / metabolism* Cyclin-Dependent Kinases / metabolism Mitosis* Schizosaccharomyces Schizosaccharomyces pombe Proteins / genetics Schizosaccharomyces pombe Proteins / metabolism* |
| IF | 4.015 |
| Altmetric score |
オルトメトリクス指標項目
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| The most frequently cited source | News |
| Total number of mentions | 2 |
| Altmetric score changes over past 6months | 0.0 |
| Resource | |
| Yeast | |