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Simian virus 40 large T antigen targets the spindle assembly checkpoint protein Bub1.

The mitotic spindle checkpoint protein Bub1 has been found to be mutated at low frequency in certain human cancers characterized by aneuploidy. Simian virus 40 large T antigen efficiently immortalizes rodent cells and occasionally transforms them to tumorigenicity. T antigen can also cause genomic instability, inducing chromosomal aberrations and aneuploidy. Here, we report an interaction between Bub1 and T antigen. T antigen coimmunoprecipitates with endogenous Bub1 and Bub3, another component of the spindle checkpoint complex. Genetic analysis demonstrates that the interaction of T antigen with Bub1 is not required for immortalization but is closely correlated with transformation. T antigen induces an override of the spindle checkpoint dependent on Bub1 binding. This interaction with proteins of the spindle checkpoint machinery suggests another role for T antigen and provides insight into its ability to cause chromosomal aberrations, aneuploidy, and transformation.[1]

References

  1. Simian virus 40 large T antigen targets the spindle assembly checkpoint protein Bub1. Cotsiki, M., Lock, R.L., Cheng, Y., Williams, G.L., Zhao, J., Perera, D., Freire, R., Entwistle, A., Golemis, E.A., Roberts, T.M., Jat, P.S., Gjoerup, O.V. Proc. Natl. Acad. Sci. U.S.A. (2004) [Pubmed]
 
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