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. 1991 Oct;65(10):5417–5424. doi: 10.1128/jvi.65.10.5417-5424.1991

Complex formation between the lymphotropic papovavirus large tumor antigen and the tumor suppressor protein p53.

H Symonds 1, J D Chen 1, T Van Dyke 1
PMCID: PMC249025  PMID: 1895390

Abstract

The simian B-lymphotropic papovavirus (LPV) encodes a large tumor antigen (T antigen) which is 45% identical to both the simian virus 40 (SV40) and the polyomavirus (PyV) large T antigens. In transgenic mice, the transforming properties of the LPV T antigen are similar to those of the SV40 T antigen. However, little is known about its biochemical activities. Since SV40 T antigen forms a complex with and stabilizes the host cell tumor suppressor protein p53 while the PyV large T antigen does not, we characterized the LPV T antigen for its ability to complex p53. We demonstrate an association between LPV T antigen and p53 in both a tumor-derived cell line and BALB/c 3T3 cells transformed in culture. A third protein of approximately 68 kDa which was found associated with the LPV T antigen-p53 complex in tumor-derived cells appears to be heat shock protein 70 (hsp70). The half-life of p53 in all LPV T-antigen-transformed cells was extended significantly; i.e., it was 3 to 7 h compared with 19 minutes in BALB/c 3T3 cells. The half-life of the LPV T antigen itself was 5 to 9 h depending on the cell line origin. That p53 was stabilized because of association with LPV T antigen and not because of mutation was demonstrated with the p53 conformation-dependent monoclonal antibody PAb246. This antibody distinguishes between wild-type p53 (PAb246+) and mutant, oncogenic p53 (PAb246-). Sequential immunoprecipitation showed all detectable p53 to be of the PAb246+ class in each LPV-transformed cell line, suggesting that the stable p53 was indeed wild type.

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Selected References

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