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Molecular and Cellular Biology, November 1998, p. 6316-6324, Vol. 18, No. 11
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Viral Oncoproteins Discriminate between p53 and the p53 Homolog p73

Maria Carmen Marin,1 Christine A. Jost,1 Meredith S. Irwin,1 James A. DeCaprio,1 Daniel Caput,2 and William G. Kaelin Jr.1,3,*

Dana-Farber Cancer Institute and Harvard Medical School1 and Howard Hughes Medical Institute,3 Boston, Massachusetts 02115, and Sanofi Recherche, Labege, France2

Received 30 April 1998/Returned for modification 11 June 1998/Accepted 27 July 1998

p73 is a recently identified member of the p53 family. Previously it was shown that p73 can, when overproduced in p53-defective tumor cells, activate p53-responsive promoters and induce apoptosis. In this report we describe the generation of anti-p73 monoclonal antibodies and confirm that two previously described p73 isoforms are produced in mammalian cells. Furthermore, we show that these two isoforms can bind to canonical p53 DNA-binding sites in electrophoretic mobility shift assays. Despite the high degree of similarity between p53 and p73, we found that adenovirus E1B 55K, simian virus 40 T, and human papillomavirus E6 do not physically interact with p73. The observation that viral oncoproteins discriminate between p53 and p73 suggests that the functions of these two proteins may differ under physiological conditions. Furthermore, they suggest that inactivation of p73 may not be required for transformation.

* Corresponding author. Mailing address: Dana-Farber Cancer Institute, 44 Binney St., Boston, MA 02115. Phone: (617) 632-3975. Fax: (617) 632-4760. E-mail: william_kaelin{at}dfci.harvard.edu.

Molecular and Cellular Biology, November 1998, p. 6316-6324, Vol. 18, No. 11
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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