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Journal Article | Research Support, Non-U.S. Gov't

Inactivation of the retinoblastoma susceptibility protein is not sufficient for the transforming function of the conserved region 2-like domain of simian virus 40 large T antigen.

J B Christensen, M J Imperiale
J B Christensen
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M J Imperiale
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ABSTRACT

Simian virus 40 large T antigen interacts with three cellular proteins, pRb, p107, and p130, through a common binding site on the T antigen protein called the E1A conserved region 2-like (CR2-like) domain. Mutations in this domain inactivate the transforming activity of large T antigen. Since these mutations have been demonstrated to abolish binding to pRb and p107, and presumably therefore affect binding to p130, assessment of the relative roles of these three proteins in transformation of rodent fibroblasts by T antigen has been difficult. We have examined the role of T antigen-pRb interactions in transformation. We have introduced a mutant T antigen, which is unable to bind any of these three proteins, into primary mouse fibroblasts derived from the embryos of mice in which the Rb gene encoding the retinoblastoma protein had been disrupted. This mutant is unable to transform the Rb-negative fibroblasts, indicating that inactivation of pRb is not the sole function of the CR2-like domain in the induction of transformation of mouse fibroblasts by simian virus 40.

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Inactivation of the retinoblastoma susceptibility protein is not sufficient for the transforming function of the conserved region 2-like domain of simian virus 40 large T antigen.
J B Christensen, M J Imperiale
Journal of Virology Jun 1995, 69 (6) 3945-3948; DOI:

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Inactivation of the retinoblastoma susceptibility protein is not sufficient for the transforming function of the conserved region 2-like domain of simian virus 40 large T antigen.
J B Christensen, M J Imperiale
Journal of Virology Jun 1995, 69 (6) 3945-3948; DOI:
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