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Journal of Virology, January 2001, p. 396-407, Vol. 75, No. 1
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.1.396-407.2001

Genetic Evidence of a Role for ATM in Functional Interaction between Human T-Cell Leukemia Virus Type 1 Tax and p53

Phillip L. Van,1 Kyong-Wook Yim,1 Dong-Yan Jin,1 George Dapolito,1 Akihiro Kurimasa,2 and Kuan-Teh Jeang1,*

Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892,1 and Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 947202

Received 30 June 2000/Accepted 22 September 2000

Recent evidence from several investigators suggest that the human T-cell leukemia virus type 1 Tax oncoprotein represses the transcriptional activity of the tumor suppressor protein, p53. An examination of published findings reveals serious controversy as to the mechanism(s) utilized by Tax to inhibit p53 activity and whether the same mechanism is used by Tax in adherent and suspension cells. Here, we have investigated Tax-p53 interaction simultaneously in adherent epithelial (HeLa and Saos) and suspension T-lymphocyte (Jurkat) cells. Our results indicate that Tax activity through the CREB/CREB-binding protein (CBP), but not NF-kappa B, pathway is needed to repress the transcriptional activity of p53 in all tested cell lines. However, we did find that while CBP binding by Tax is necessary, it is not sufficient for inhibiting p53 function. Based on knockout cell studies, we correlated a strong genetic requirement for the ATM, but not protein kinase-dependent DNA, protein in conferring a Tax-p53-repressive phenotype.

* Corresponding author. Mailing address: LMM, NIAID, NIH, Building 4, Room 306, 9000 Rockville Pike, Bethesda, MD 20892-0460. Phone: (301) 496-6680. Fax: (301) 480-3686. E-mail: kj7e{at}nih.gov.

Journal of Virology, January 2001, p. 396-407, Vol. 75, No. 1
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.1.396-407.2001


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