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Molecular and Cellular Biology, March 1999, p. 1751-1758, Vol. 19, No. 3
0270-7306/99

Regulation of p53 Function and Stability by Phosphorylation

Margaret Ashcroft, Michael H. G. Kubbutat, and Karen H. Vousden*

ABL Basic Research Program, NCI-FCRDC, Frederick, Maryland

Received 18 August 1998/Returned for modification 5 October 1998/Accepted 24 November 1998

The p53 tumor suppressor protein can be phosphorylated at several sites within the N- and C-terminal domains, and several protein kinases have been shown to phosphorylate p53 in vitro. In this study, we examined the activity of p53 proteins with combined mutations at all of the reported N-terminal phosphorylation sites (p53N-term), all of the C-terminal phosphorylation sites (p53C-term), or all of the phosphorylation sites together (p53N/C-term). Each of these mutant proteins retained transcriptional transactivation functions, indicating that phosphorylation is not essential for this activity of p53, although a subtle contribution of the C-terminal phosphorylation sites to the activation of expression of the endogenous p21Waf1/Cip1-encoding gene was detected. Mutation of the phosphorylation sites to alanine did not affect the sensitivity of p53 to binding to or degradation by Mdm2, although alteration of residues 15 and 37 to aspartic acid, which could mimic phosphorylation, resulted in a slight resistance to Mdm2-mediated degradation, consistent with recent reports that phosphorylation at these sites inhibits the p53-Mdm2 interaction. However, expression of the phosphorylation site mutant proteins in both wild-type p53-expressing and p53-null lines showed that all of the mutant proteins retained the ability to be stabilized following DNA damage. This indicates that phosphorylation is not essential for DNA damage-induced stabilization of p53, although phosphorylation could clearly contribute to p53 stabilization under some conditions.

* Corresponding author. Mailing address: ABL Basic Research Program, NCI-FCRDC, Building 560, Room 22-96, West 7th St., Frederick, MD 21702-1201. Phone: (301) 846-1726. Fax: (301) 846-1666. E-mail: vousden{at}ncifcrf.gov.

Molecular and Cellular Biology, March 1999, p. 1751-1758, Vol. 19, No. 3
0270-7306/99


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