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  • cell cycle  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Proteasome-dependent degradation of human CDC25B phosphatase (1999)
    Springer
    Molecular biology reports 26 (1999), S. 53-57 
    Details
    ISSN: 1573-4978
    Keywords: Cdc25B ; cell cycle ; cyclin-dependent kinase ; phosphatase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The CDC25 dual specificity phosphatase is a universal cell cycle regulator. The evolutionary conservation of this enzyme from yeast to man bears witness to its major role in the control of cyclin-dependent kinases (CDK) activity that are central regulators of the cell cycle machinery. CDC25 phosphatase both dephosphorylates and activates CDKs. Three human CDC25s have been identified. CDC25A is involved in the control of G1/S, and CDC25C at G2/M throught the activation of CDK1-cyclin B. The exact function of CDC25B however remains elusive. We have found that CDC25B is degraded by the proteasome pathway in vitro and in vivo. This degradation is dependent upon phosphorylation by the CDK1-cyclin A complex, but not by CDK1-cyclin B. Together with the observations of others made in yeast and mammals, our results suggest that CDC25B might act as a ‘mitotic starter’ triggering the activation of an auto-amplification loop before being degraded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006912105352
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of phleomycin-induced DNA damage on the fission yeast Schizosaccharomyces pombe cell cycle (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 11 (1995), S. 225-231 
    Details
    ISSN: 0749-503X
    Keywords: fission yeast ; cell cycle ; phleomycin ; DNA damage ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The effect of phleomycin, a bleomycin-like antibiotic, has been investigated in the fission yeast, Schizosaccharomyces pombe. We report that in response to phleomycin-induced DNA damage, growth was inhibited and S. pombe cells arrested in the G2-phase of the cell cycle. DNA repair mutants rad9 and rad17 did not arrest and were hypersensitive to phleomycin. Cell cycle mutants that entered mitosis without monitoring the completion of DNA replication also displayed an increased sensitivity to this DNA-damaging agent. Thus, phleomycin could be used as a tool in the fission yeast S. pombe model system for the study of DNA damage and cell cycle checkpoints, or as a new selective agent.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320110305
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of an active GST-human Cdc2 fusion protein kinase expressed in the fission yeast Schizosaccharomyces pombe: A new approach to the study of cell cycle control proteins (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 10 (1994), S. 1631-1638 
    Details
    ISSN: 0749-503X
    Keywords: Schizosaccharomyces pombe ; cell cycle ; Cdc2 kinase ; GST ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Characterization of cdk (cyclin dependent kinases) substrates and studies of their regulation require purified enzymatic complexes of cdc2-related catalytic and cyclin regulatory subunits. We produced human Cdc2 kinase in the fission yeast Schizosaccharomyces pombe as a fusion protein with glutathione S-transferase (GST). The GST-human Cdc2p fusion protein was active in vivo since it rescued a temperature-sensitive allele of cdc2. The fusion protein was purified using a one-step chromatography procedure with glutathione-Sepharose and exhibited a catalytic activity in vitro. Yeast cyclin B and suc1 were found in association with GST-Cdc2. A 17-fold stimulation of GST-Cdc2 kinase activity was obtained by incubation of recombinant human cyclin A with the S. pombe cellular extract prior to affinity purification. This indicates that cyclin concentration is limiting in this overexpression system. These findings describe a fast and easy production of active recombinant human Cdc2 kinase in yeast that can be used for biochemical studies.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320101212
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