Interaction of human polyomavirus BK with the tumor-suppressor protein p53 - PubMed
- ️Mon Jan 01 1996
Comparative Study
. 1996 Jul 18;13(2):323-32.
Affiliations
- PMID: 8710371
Comparative Study
Interaction of human polyomavirus BK with the tumor-suppressor protein p53
C V Shivakumar et al. Oncogene. 1996.
Abstract
We have been studying the interaction of the oncogenic human polyomavirus BK (BKV) with the tumor-suppressor protein p53 to understand the biology of this virus as well as to understand the basic mechanisms of p53 transactivation. We here demonstrate that p53 binds specifically to the viral promoter at two different sites, S-I (np 361-383) and S-II (np 314-336) in the late region. Site S-I is a 23 bp domain comprising an unique combination of a 10 bp consensus monomer binding site (Pu Pu Pu C (A/T) (T/A) G Py Py Py) which is contiguous with a GC-rich Sp-1 motif that binds p53 in the SV40 promoter. Site S-II also spans a 23 bp sequence containing two tandem consensus binding sites with three base pair mismatches in each and a one base pair deletion. A dimer of a 100 bp region spanning both the binding sites or the site S-I alone induced p53 responsiveness to a basal promoter when cloned upstream from the TATA box, but a similar construct using S-II did not. One tumor-derived mutant protein, p53-175 H, which is defective in DNA binding, also failed to transactivate the reporter gene. We further show that p53 binding-dependent transactivation is abrogated by BKV large T antigen, thereby suggesting an interaction between these two proteins in vivo. In contrast to the isolated p53 binding site, viral early promoter is repressed by p53 in H 1299 cells and the mutants are defective in this function to varying extent. This is suggestive of an involvement of cellular factors in modulating p53's function in the context of the whole promoter. p53 binding sites in BKV are flanked by the binding sites for transcription factors Sp-1 and NF-1 and we show that these transcription factors are present in the immunocomplex with purified p53, implicating modification of p53's transactivation function by protein-protein interaction. Thus, oncoprotein synthesis in this virus might be modulated by p53 in vivo by a complex mechanism other than simple DNA binding and sequestration of the TATA binding protein. Together with SV40 and polyomavirus, which also harbor p53 binding sites, this viral system will serve as a model to understand the role of p53 in viral infection.
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