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Article

Understanding the loss-of-function in a triple missense mutant of DNA polymerase β found in prostate cancer

  • Authors:
    • Changlong An
    • William A. Beard
    • Desheng Chen
    • Samuel H. Wilson
    • Nick M. Makridakis
  • View Affiliations / Copyright

    Affiliations: Department of Epidemiology and Tulane Cancer Center, Tulane University, New Orleans, LA 70112, USA, Laboratory of Structural Biology, NIEHS, National Institutes of Health, Research Triangle Park, NC 27709, USA
  • Pages: 1131-1140
    |
    Published online on: July 19, 2013
       https://doi.org/10.3892/ijo.2013.2022
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Abstract

Human DNA polymerase (pol) β is essential for base excision repair. We previously reported a triple somatic mutant of pol β (p.P261L/T292A/I298T) found in an early onset prostate tumor. This mutation abolishes polymerase activity, and the wild-type allele was not present in the tumor, indicating a complete deficiency in pol β function. The effect on polymerase activity is unexpected because the point mutations that comprise the triple mutant are not part of the active site. Herein, we demonstrate the mechanism of this loss-of-function. In order to understand the effect of the individual point mutations we biochemically analyzed all single and double mutants that comprise the triple mutant. We found that the p.I298T mutation is responsible for a marked instability of the triple mutant protein at 37˚C. At room temperature the triple mutant's low efficiency is also due to a decrease in the apparent binding affinity for the dNTP substrate, which is due to the p.T292A mutation. Furthermore, the triple mutant displays lower fidelity for transversions in vitro, due to the p.T292A mutation. We conclude that distinct mutations of the triple pol β mutant are responsible for the loss of activity, lower fidelity, and instability observed in vitro.
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Copy and paste a formatted citation
Spandidos Publications style
An C, Beard WA, Chen D, Wilson SH and Makridakis NM: Understanding the loss-of-function in a triple missense mutant of DNA polymerase β found in prostate cancer. Int J Oncol 43: 1131-1140, 2013.
APA
An, C., Beard, W.A., Chen, D., Wilson, S.H., & Makridakis, N.M. (2013). Understanding the loss-of-function in a triple missense mutant of DNA polymerase β found in prostate cancer. International Journal of Oncology, 43, 1131-1140. https://doi.org/10.3892/ijo.2013.2022
MLA
An, C., Beard, W. A., Chen, D., Wilson, S. H., Makridakis, N. M."Understanding the loss-of-function in a triple missense mutant of DNA polymerase β found in prostate cancer". International Journal of Oncology 43.4 (2013): 1131-1140.
Chicago
An, C., Beard, W. A., Chen, D., Wilson, S. H., Makridakis, N. M."Understanding the loss-of-function in a triple missense mutant of DNA polymerase β found in prostate cancer". International Journal of Oncology 43, no. 4 (2013): 1131-1140. https://doi.org/10.3892/ijo.2013.2022
Copy and paste a formatted citation
x
Spandidos Publications style
An C, Beard WA, Chen D, Wilson SH and Makridakis NM: Understanding the loss-of-function in a triple missense mutant of DNA polymerase β found in prostate cancer. Int J Oncol 43: 1131-1140, 2013.
APA
An, C., Beard, W.A., Chen, D., Wilson, S.H., & Makridakis, N.M. (2013). Understanding the loss-of-function in a triple missense mutant of DNA polymerase β found in prostate cancer. International Journal of Oncology, 43, 1131-1140. https://doi.org/10.3892/ijo.2013.2022
MLA
An, C., Beard, W. A., Chen, D., Wilson, S. H., Makridakis, N. M."Understanding the loss-of-function in a triple missense mutant of DNA polymerase β found in prostate cancer". International Journal of Oncology 43.4 (2013): 1131-1140.
Chicago
An, C., Beard, W. A., Chen, D., Wilson, S. H., Makridakis, N. M."Understanding the loss-of-function in a triple missense mutant of DNA polymerase β found in prostate cancer". International Journal of Oncology 43, no. 4 (2013): 1131-1140. https://doi.org/10.3892/ijo.2013.2022
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