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Molecular and Cellular Biology, December 2000, p. 9391-9398, Vol. 20, No. 24
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Multiple Lysine Mutations in the C-Terminal Domain of p53 Interfere with MDM2-Dependent Protein Degradation and Ubiquitination

Seiichi Nakamura,1 Jack A. Roth,1,2 and Tapas Mukhopadhyay1,*

Section of Thoracic Molecular Oncology, Departments of Thoracic and Cardiovascular Surgery1 and Tumor Biology,2 The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030

Received 18 February 2000/Returned for modification 4 April 2000/Accepted 11 September 2000

To investigate the effect of mutations in the p53 C-terminal domain on MDM2-mediated degradation, we introduced single and multiple point mutations into a human p53 cDNA at four putative acetylation sites (amino acid residues 372, 373, 381, and 382). Substitution of all four lysine residues by alanines (the A4 mutant) and single lysine-to-alanine substitutions were functional in sequence-specific DNA binding and transactivation; however, the A4 mutant protein was resistant to MDM2-mediated degradation, whereas the single lysine substitutions were not. Although the A4 mutant protein and the single lysine substitutions both bound MDM2 reasonably well, the single lysine substitutions underwent normal MDM2-dependent ubiquitination, whereas the A4 protein was inefficiently ubiquitinated. In addition, the A4 mutant protein was found in the cytoplasm as well as in the nucleus of a subpopulation of cells, unlike wild-type p53, which is mostly nuclear. The partially cytoplasmic distribution of A4 mutant protein was not due to a defect in nuclear import because inhibition of nuclear export by leptomycin B resulted in nuclear accumulation of the protein. Taken together, the data suggest that mutations in the putative acetylation sites of the p53 C-terminal domain interfere with ubiquitination, thereby regulating p53 degradation.

* Corresponding author. Mailing address: Department of Thoracic and Cardiovascular Surgery, Box 109, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030. Phone: (713) 745-4542. Fax: (713) 794-4901. E-mail: tmukhopa{at}notes.mdacc.tmc.edu.

Molecular and Cellular Biology, December 2000, p. 9391-9398, Vol. 20, No. 24
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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