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. 1980 Dec;36(3):805–815. doi: 10.1128/jvi.36.3.805-815.1980

Association of pp60src and src protein kinase activity with the plasma membrane of nonpermissive and permissive avian sarcoma virus-infected cells.

R A Krzyzek, R L Mitchell, A F Lau, A J Faras
PMCID: PMC353708  PMID: 6257928

Abstract

The intracellular localization of pp60src and src protein kinase activity in avian sarcoma virus (ASV)-infected chicken embryo fibroblasts and transformed and morphologically reverted field vole cells was examined by subcellular fractionation procedures. Fractionation by differential centrifugation of Dounce-homogenized cellular extracts prepared from vole cells showed that 83 to 91% of pp60src sedimented with particulate subcellular components from both transformed and revertant vole cells. A slightly lesser amount (60 to 70%) of pp60src was found associated with the particulate fraction from ASV-infected chicken embryo fibroblasts. The distribution of src protein kinase activity in the cytosol and particulate cell fractions was identical to that of pp60src, indicating no detectable differences in the activity of cytosol- and particulate-associated pp60src. When subcellular components of the cell were fractionated by discontinuous sucrose gradient centrifugation, similar amounts of both pp60src and src protein kinase activity cosedimented with the plasma membrane fractions from both transformed and revertant vole cells, as well as from ASV-infected chicken embryo fibroblasts. src protein kinase activity associated with plasma membrane fractions prepared from vole cells and ASV-infected chicken embryo fibroblasts was resistant to extraction with high salt concentrations, but partial elution was achieved with nonionic detergent. Thus, in both transformed and morphologically reverted vole cells, pp60src is intimately associated with the plasma membrane. Since transforming virus can be rescued from revertant vole cells by fusion to chicken embryo fibroblasts, revertant vole cell pp60src is capable of inducing morphological transformation. Thus, although the data presented herein suggest that transformation requires the association of pp60src with the plasma membrane, the binding of pp60src to the plasma membrane per se is insufficient to induce morphological transformation and requires the additional interaction with a specific target membrane protein which appears to be defective in revertant vole cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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