Phosphorylation of p53 protein in response to ionizing radiation occurs at multiple sites in both normal and DNA-PK deficient cells
Open Access
- 25 February 1999
- journal article
- research article
- Published by Springer Science and Business Media LLC in Oncogene
- Vol. 18 (8), 1521-1527
- https://doi.org/10.1038/sj.onc.1202454
Abstract
The tumour suppressor gene product, p53, is involved in mediating cellular responses to DNA damage including growth arrest and/or apoptosis. The mechanism by which p53 protein senses the presence of damaged DNA is not understood. The possibility that p53 may be post-translationally modified by enzymes that are activated in response to DNA damage including DNA-dependent protein kinase (DNA-PK), poly(ADP-ribose) polymerase and stress activated protein kinase has received considerable attention. Recent studies have indicated that DNA-PK is not required for the transactivation or apoptosis-promoting activities of p53 protein. However, the possibility that other functions of p53 may be dependent on phosphorylation by DNA-PK has not been explored. Here we describe a series of experiments that compares the expression, function and phosphorylation status of p53 protein in normal and DNA-PK-deficient scid cells. While several novel p53 phosphoforms are generated in response to DNA damage in normal cells, the same phosphoforms are observed in scid cells.Keywords
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