Abstract
LTE1 encodes a homolog of GDP-GTP exchange factors for the Ras superfamily and is required at low temperatures for cell cycle progression at the stage of the termination of M phase inSaccharomyces cerevisiae. We isolated extragenic suppressors which suppress the cold sensitivity oflte1 cells and confer a temperature-sensitive phenotype on cells. Cells mutant for the suppressor alone were arrested at telophase at non-permissive temperatures and the terminal phenotype was almost identical to that oflte1 cells at non-permissive temperatures. Genetic analysis revealed that the suppressor is allelic toCDC15, which encodes a protein kinase. Thecdc15 mutations thus isolated were recessive with regard to the temperature-sensitive phenotype and were dominant with respect to suppression oflte1. We isolatedCDC14 as a low-copy-number suppressor ofcdc15-rlt1.CDC14 encodes a phosphotyrosine phosphatase (PTPase) and is essential for termination of M phase. An extra copy ofCDC14 suppressed the temperature sensitivity ofcdc15-rlt1 cells, but not that ofcdc15-1 cells. In addition, some residues that are essential for the Cdc14 PTPase activity were found to be non-essential for the suppression. These results strongly indicate that Cdc14 possesses dual functions; PTPase activity is needed for one function but not for the other. We postulate that the cooperative action of Cdc14 and Cdc15 plays an essential role in the termination of M phase.
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Shirayama, M., Matsui, Y. & Toh-e, A. Dominant mutant alleles of yeast protein kinase geneCDC15 suppress thelte1 defect in termination of M phase and genetically interact withCDC14 . Molec. Gen. Genet. 251, 176–185 (1996). https://doi.org/10.1007/BF02172916
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DOI: https://doi.org/10.1007/BF02172916