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Gene for M1 subunit of ribonucleotide reductase is amplified in hydroxyurea-resistant hamster cells

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Somatic Cell and Molecular Genetics

Abstract

The hydroxyurea-resistant Chinese hamster cell line 600H has been shown to have greatly elevated quantities of ribonucleotide reductase. This increase in enzyme activity is due to an increased level of both the M1 and M2 subunit activities. The M1 subunit has been purified from the 600H cell line and shown to consist of a series of six protein spots with apparent molecular weights of 88,000 daltons, but with varying isoelectric points in the range of pH 6.5–7.0. Western blot analyses with antisera against the M1 and M2 proteins indicated that both subunit proteins are present in elevated quantities in the 600H cell line when compared to the wild-type V79 cell line. Southern blot analyses with genomic DNA from the series of stepwise-selected hydroxyurea-resistant cell lines leading to 600H showed that, in latter steps of selection, genomic sequences homologous to a mouse M1 cDNA have undergone a fivefold amplication. This was accompanied by a four-to eightfold increase in the single M1 homologous mRNA.

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Authors and Affiliations

  1. Department of Microbiology, University of Toronto, M5S 1A8, Toronto, Ontario, Canada

    Joan M. Cocking, Patricia N. Tonin, Nancy M. Stokoe, Enrico J. Wensing & William H. Lewis

  2. Department of Biochemistry and Molecular Biophysics, College of Physicians and Surgeons, Columbia University, 10032, New York, New York

    P. R. Srinivasan

Authors
  1. Joan M. Cocking
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  2. Patricia N. Tonin
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  3. Nancy M. Stokoe
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  4. Enrico J. Wensing
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  5. William H. Lewis
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  6. P. R. Srinivasan
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Cocking, J.M., Tonin, P.N., Stokoe, N.M. et al. Gene for M1 subunit of ribonucleotide reductase is amplified in hydroxyurea-resistant hamster cells. Somat Cell Mol Genet 13, 221–233 (1987). https://doi.org/10.1007/BF01535204

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  • DOI: https://doi.org/10.1007/BF01535204

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