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Activity of Cdc2 and its interaction with the cyclin Cdc13 depend on the molecular chaperone Cdc37 in Schizosaccharomyces pombe.

J. Cell. Sci.2006 Jan 15;119(Pt 2):292-302. Epub 2006 Jan 03
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摘要


Cdc37 is a molecular chaperone whose clients are predominantly protein kinases, many of which are important in cell-cycle progression. Temperature-sensitive mutants of cdc37 in Schizosaccharomyces pombe are lethal at the restrictive temperature, arresting cell division within a single cell cycle. These mutant cells elongate during incubation at the restrictive temperature, consistent with a cell-cycle defect. The cell-cycle arrest arises from defective function of the mutant Cdc37 proteins rather than a reduction in Cdc37 protein levels. Around 80% of the arrested, elongated cells contain a single nucleus and replicated (2C) DNA content, indicating that these mutants arrest the cell cycle in G2 or mitosis (M). Cytological observations show that the majority of cells arrest in G2. In fission yeast, a G2 cell-cycle arrest can arise by inactivation of the cyclin-dependent kinase (Cdk) Cdc2 that regulates entry into mitosis. Studies of the cdc37 temperature-sensitive mutants show a genetic interaction with some cdc2 alleles and overexpression of cdc2 rescues the lethality of some cdc37 alleles at the restrictive temperature, suggesting that Cdc2 is a likely client for the Cdc37 molecular chaperone. In cdc37 temperature-sensitive mutants at the restrictive temperature, the level of Cdc2 protein remains constant but Cdc2 protein kinase activity is greatly reduced. Inactivation of Cdc2 appears to result from the inability to form complexes with its mitotic cyclin partner Cdc13. Further evidence for Cdc2 being a client of Cdc37 in S. pombe comes from the identification of genetic and biochemical interactions between these proteins.

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