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Molecular and Cellular Biology, August 2002, p. 5801-5812, Vol. 22, No. 16
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.16.5801-5812.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Human Papillomavirus Oncoprotein E6 Inactivates the Transcriptional Coactivator Human ADA3

Ajay Kumar,1 Yongtong Zhao,1 Gaoyuan Meng,1 Musheng Zeng,1 Seetha Srinivasan,1 Laurie M. Delmolino,1 Qingshen Gao,1 Goberdhan Dimri,1 Georg F. Weber,1 David E. Wazer,1 Hamid Band,2 and Vimla Band1,3*

Division of Radiation and Cancer Biology, Department of Radiation Oncology, New England Medical Center,1 Department of Biochemistry, Tufts University School of Medicine,3 Lymphocyte Biology Section, Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 021112

Received 5 December 2001/ Returned for modification 23 January 2002/ Accepted 13 May 2002

High-risk human papillomaviruses (HPVs) are associated with carcinomas of the cervix and other genital tumors. The HPV oncoprotein E6 is essential for oncogenic transformation. We identify here hADA3, human homologue of the yeast transcriptional coactivator yADA3, as a novel E6-interacting protein and a target of E6-induced degradation. hADA3 binds selectively to the high-risk HPV E6 proteins and only to immortalization-competent E6 mutants. hADA3 functions as a coactivator for p53-mediated transactivation by stabilizing p53 protein. Notably, three immortalizing E6 mutants that do not induce direct p53 degradation but do interact with hADA3 induced the abrogation of p53-mediated transactivation and G1 cell cycle arrest after DNA damage, comparable to wild-type E6. These findings reveal a novel strategy of HPV E6-induced loss of p53 function that is independent of direct p53 degradation. Given the likely role of the evolutionarily conserved hADA3 in multiple coactivator complexes, inactivation of its function may allow E6 to perturb numerous cellular pathways during HPV oncogenesis.

* Corresponding author. Mailing address: Department of Radiation Oncology, Box # 824, New England Medical Center, 750 Washington St., Boston, MA 02111. Phone: (617) 636-4776. Fax: (617) 636-6205. E-mail: vband{at}lifespan.org.

Molecular and Cellular Biology, August 2002, p. 5801-5812, Vol. 22, No. 16
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.16.5801-5812.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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