Premature initiation of mitosis in yeast lacking RCC1 or an interacting GTPase

Matsumoto, T., Beach, D. (July 1991) Premature initiation of mitosis in yeast lacking RCC1 or an interacting GTPase. Cell, 66 (2). pp. 347-60. ISSN 0092-8674 (Print)0092-8674 (Linking)

DOI: 10.1016/0092-8674(91)90624-8


A fission yeast mutant is described in which the onset of mitosis is uncoupled from the completion of DNA replication. pim1 (premature initiation of mitosis) cells can undergo mitotic chromosome condensation and mitotic spindle formation without completion of S phase and without the cdc25 mitotic inducer. The M phase kinase is required for pim1-induced mitosis and becomes activated. pim1 encodes a homolog of the human RCC1 nuclear protein. pim1 mutants are fully rescued by overexpression of spi1, a newly identified essential gene whose predicted product shares 81% identity with human TC4. spi1 and TC4 define a new subclass within the "ras-like" GTPase superfamily that is structurally distinct from the ras, rho, or sec4 families. Diploid yeast that carry one wild-type and one disrupted copy of spi1 have multiple satellite nuclei, and mitotic haploidization occurs at very high frequency. spi1 appears to interact with pim1 in the maintenance of a coordinated cell cycle.

Item Type: Paper
Uncontrolled Keywords: Amino Acid Sequence Base Sequence *Cell Cycle Proteins Chromosomes, Fungal DNA Replication DNA-Binding Proteins/*genetics Diploidy Fungal Proteins/*genetics GTP Phosphohydrolases/*genetics Genes, Fungal Genotype *Guanine Nucleotide Exchange Factors Humans Molecular Sequence Data Multigene Family Mutagenesis Nuclear Proteins/*genetics Phenotype *Protein-Serine-Threonine Kinases Proto-Oncogene Proteins/genetics Proto-Oncogene Proteins c-pim-1 Schizosaccharomyces/cytology/enzymology/*genetics/growth & development Sequence Homology, Nucleic Acid Spores, Fungal/physiology *ras Proteins
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > DNA replication
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > GTPase
organs, tissues, organelles, cell types and functions > organelles, types and functions > mitosis
organism description > yeast
CSHL Authors:
Communities: CSHL labs > Beach lab
Depositing User: Matt Covey
Date: 26 July 1991
Date Deposited: 21 Dec 2015 20:23
Last Modified: 21 Dec 2015 20:23
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