Molecular Genetics and Genomics

, Volume 269, Issue 5, pp 672–684 | Cite as

Mutations in the yeast cyclin-dependent kinase Cdc28 reveal a role in the spindle assembly checkpoint

Original Paper

Abstract

Anaphase onset and mitotic exit are regulated by the spindle assembly or kinetochore checkpoint, which inhibits the anaphase-promoting complex (APC), preventing the degradation of anaphase inhibitors and mitotic cyclins. As a result, cells arrest with high cyclin-dependent kinase (CDK) activity due to the accumulation of cyclins. Aside from this, a clear-cut demonstration of a direct role for CDKs in the spindle checkpoint response has been elusive. Cdc28 is the main CDK driving the cell cycle in budding yeast. In this report, mutations in cdc28 are described that confer specific checkpoint defects, supersensitivity towards microtubule poisons and chromosome loss. Two alleles encode single mutations in the N and C terminal regions, respectively (R10G and R288G), and one allele specifies two mutations near the C terminus (F245L, I284T). These cdc28 mutants are unable to arrest or efficiently prevent sister chromatid separation during treatment with nocodazole. Genetic interactions with checkpoint and apc mutants suggest Cdc28 may regulate checkpoint arrest downstream of the MAD2 and BUB2 pathways. These studies identify a C-terminal domain of Cdc28 required for checkpoint arrest upon spindle damage that mediates chromosome stability during vegetative growth, suggesting that it has an essential surveillance function in the unperturbed cell cycle.

Keywords

Anaphase Cell cycle Chromosome segregation Mitosis 

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Center for Molecular Oncology and Dept. of Molecular Genetics and Cell BiologyUniversity of ChicagoChicagoUSA

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