Abstract
We have previously demonstrated that the human T-cell leukemia virus type 1 (HTLV-1) Tax oncoprotein represses the trans-activation function of p53 tumor suppressor protein. Recently, several proteins with sequence homology to p53 have been identified. In this study, we demonstrated that Tax represses the trans-activation functions of p73α, p73β, and p51A, the p53-related proteins, as well as p53. Moreover, a mutant Tax of coactivator CBP-binding site (K88A), which activated NF-κB but not CREB pathway, could not repress the p73 nor p51 trans-activation functions, indicating that CBP-binding domain of Tax is essential for the suppression of their functions. Using proteins of Gal4-fused N-terminal region of p73 and p51, we showed that Tax-mediated inactivation of p73 or p51 requires for their N-terminal trans-activation domains. Furthermore, only the putative N-terminal trans-activation domains of them did not have enough transcriptional activities and their adjacent regions are essential for their full trans-activation, suggesting the existence of their second trans-activation subdomains. Thus, HTLV-1 Tax inactivated the p53-related proteins through their N-terminal trans-activation domains.
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Acknowledgements
We thank Dr M Hatanaka for the supply of pH2R Tax and pCMV Tax, Dr B Vogelstein for pC53-SN3, and Dr T Kiyono for pCAST2Bluc. We also thank Mr O Masui for helping our work. This work was supported in part by Grants-in-Aid for Scientific Research from Ministry of Education, Science, Sports and Culture of Japan.
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Kaida, A., Ariumi, Y., Ueda, Y. et al. Functional impairment of p73 and p51, the p53-related proteins, by the human T-cell leukemia virus type 1 Tax oncoprotein. Oncogene 19, 827–830 (2000). https://doi.org/10.1038/sj.onc.1203387
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DOI: https://doi.org/10.1038/sj.onc.1203387
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