PMID: 8995669Feb 1, 1997Paper

The N terminus of hamster polyomavirus middle T antigen carries a determinant for specific activation of p59c-Fyn

Journal of Virology
L GoutebrozeJ Feunteun

Abstract

Transformation by rodent polyomaviruses is mediated primarily by middle T antigen, a membrane-bound protein that does not carry an intrinsic enzymatic activity but interacts and subverts the activity of cellular regulators of proliferation. The multiple protein partners of murine polyomavirus (Py) middle T antigen include the tyrosine kinases c-Src and, to a lesser extent, c-Fyn and c-Yes. By contrast, the hamster polyomavirus (HaPV) middle T antigen selectively activates the c-Fyn gene product. This difference may account for the contrasting tumor patterns induced by the two viruses. The sequences of the respective N-terminal and C-terminal functional domains of murine Py and HaPV middle T antigens are highly conserved whereas the intervening stretches are clearly divergent, leading to the speculation that this divergence may direct the specificity for tyrosine kinase activation. We have addressed this issue by constructing a chimera middle T antigen molecule carrying the N-terminal domain from HaPV (exon 1) in phase with the other two domains from murine Py (exon 2). The biological properties of this chimera molecule are indistinguishable from those of HaPV middle T antigen; it specifically activates p59c-Fyn and carries the ...Continue Reading

References

Jun 1, 1991·Journal of Virology·S A CourtneidgeJ Feunteun
Sep 1, 1993·Proceedings of the National Academy of Sciences of the United States of America·L PérezK Ballmer-Hofer
May 26, 1995·The Journal of Biological Chemistry·W SuT M Roberts
Jan 1, 1994·Advances in Cancer Research·F KieferE F Wagner

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Citations

Dec 26, 2001·Oncogene·N Ichaso, S M Dilworth
Sep 2, 2009·Microbiology and Molecular Biology Reviews : MMBR·Michele M Fluck, Brian S Schaffhausen

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