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Research Article

Transformation parameters and pp60src localization in cells infected with partial transformation mutants of Rous sarcoma virus.

L Rohrschneider, M J Rosok
L Rohrschneider
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M J Rosok
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DOI: 10.1128/MCB.3.4.731
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ABSTRACT

Rous sarcoma virus (RSV)-induced transformation is mediated by the action of the viral src gene product pp60src. This transforming protein is found at several cytoplasmic locations, including the adhesion plaques of RSV-transformed cells. In these studies, we have focused on the adhesion plaque location of pp60src and determined whether any of the induced transformation parameters correlate with the presence of pp60src in the adhesion plaques. A series of partial transformation mutants of RSV that induce distinct transformation phenotypes were used, and infected chicken embryo cells were examined for (i) intracellular pp60src location, (ii) vinculin localization, (iii) abundance of phosphotyrosine on vinculin, (iv) integrity of stress fibers, and (v) expression of cell surface fibronectin. The results indicate that, among the limited number of mutants studied here, the presence of pp60src in adhesion plaques is independent of growth in soft agar and the increased phosphorylation of vinculin on tyrosine, but it does correlate with the loss of cell surface fibronectin. An elevated abundance of phosphotyrosine on vinculin is insufficient to cause stress fiber dissolution and is independent of the loss of fibronectin from the extracellular matrix. However, the increased relative amount of phosphotyrosine on vinculin is related to the ability of the cells to grow in soft agar. The adhesion plaque binding and tyrosine-specific kinase activities seem to represent two independent functions of pp60src.

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Transformation parameters and pp60src localization in cells infected with partial transformation mutants of Rous sarcoma virus.
L Rohrschneider, M J Rosok
Molecular and Cellular Biology Apr 1983, 3 (4) 731-746; DOI: 10.1128/MCB.3.4.731

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Transformation parameters and pp60src localization in cells infected with partial transformation mutants of Rous sarcoma virus.
L Rohrschneider, M J Rosok
Molecular and Cellular Biology Apr 1983, 3 (4) 731-746; DOI: 10.1128/MCB.3.4.731
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