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. 1982 Feb;2(2):199–206. doi: 10.1128/mcb.2.2.199

Tyrosine phosphorylation of a 50K cellular polypeptide associated with the Rous sarcoma virus transforming protein pp60src.

T D Gilmore, K Radke, G S Martin
PMCID: PMC369773  PMID: 6287229

Abstract

We have examined the phosphorylation of a 50,000-dalton cellular polypeptide associated with the Rous sarcoma virus (FSV) transforming protein pp60-src. It has been shown that pp60src forms a complex with two cellular polypeptides, an 89,000-dalton heat-shock protein (89K) and a 50,000-dalton phosphoprotein (50K). The pp60src-associated protein kinase activity phosphorylates at tyrosine residues, and the 50K polypeptide present in the complex contains phosphotyrosine and phosphoserine. These observations suggest that the 50K polypeptide may be a substrate for the protein kinase activity of pp60src. To examine this possibility, we isolated the 50K polypeptide by two-dimensional polyacrylamide gel electrophoresis from lysates of uninfected or virally infected cells. Tryptic phosphopeptide analysis indicated that the 50K polypeptide isolated by this method was the same polypeptide as that complexed to pp60src. In uninfected cells or cells infected by a transformation-defective mutant, the 50K polypeptide contained phosphoserine but little or no phosphotyrosine. In cells infected by Schmidt-Ruppin or Prague RSV, there was a 40- to 50-fold increase in the quantity of phosphotyrosine in the 50K protein. Thus, the phosphorylation of the 50K polypeptide at tyrosine is dependent on the presence of pp60src. However, the 50K polypeptide isolated from cells infected by temperature-sensitive mutants of RSV was found to be phosphorylated at tyrosine at both permissive and nonpermissive temperatures; this behavior is different from that of other substrates or putative substrates of the pp60src kinase activity. It is possible that the 50K polypeptide is a high-affinity substrate of pp60src.

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Selected References

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  1. Beemon K., Hunter T. Characterization of Rous sarcoma virus src gene products synthesized in vitro. J Virol. 1978 Nov;28(2):551–566. doi: 10.1128/jvi.28.2.551-566.1978. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Brautigan D. L., Bornstein P., Gallis B. Phosphotyrosyl-protein phosphatase. Specific inhibition by Zn. J Biol Chem. 1981 Jul 10;256(13):6519–6522. [PubMed] [Google Scholar]
  3. Brugge J. S., Erikson E., Erikson R. L. The specific interaction of the Rous sarcoma virus transforming protein, pp60src, with two cellular proteins. Cell. 1981 Aug;25(2):363–372. doi: 10.1016/0092-8674(81)90055-6. [DOI] [PubMed] [Google Scholar]
  4. Brugge J. S., Erikson R. L. Identification of a transformation-specific antigen induced by an avian sarcoma virus. Nature. 1977 Sep 22;269(5626):346–348. doi: 10.1038/269346a0. [DOI] [PubMed] [Google Scholar]
  5. Collett M. S., Erikson E., Purchio A. F., Brugge J. S., Erikson R. L. A normal cell protein similar in structure and function to the avian sarcoma virus transforming gene product. Proc Natl Acad Sci U S A. 1979 Jul;76(7):3159–3163. doi: 10.1073/pnas.76.7.3159. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Collett M. S., Erikson R. L. Protein kinase activity associated with the avian sarcoma virus src gene product. Proc Natl Acad Sci U S A. 1978 Apr;75(4):2021–2024. doi: 10.1073/pnas.75.4.2021. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Collett M. S., Purchio A. F., Erikson R. L. Avian sarcoma virus-transforming protein, pp60src shows protein kinase activity specific for tyrosine. Nature. 1980 May 15;285(5761):167–169. doi: 10.1038/285167a0. [DOI] [PubMed] [Google Scholar]
  8. Cooper J. A., Hunter T. Changes in protein phosphorylation in Rous sarcoma virus-transformed chicken embryo cells. Mol Cell Biol. 1981 Feb;1(2):165–178. doi: 10.1128/mcb.1.2.165. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Erikson E., Cook R., Miller G. J., Erikson R. L. The same normal cell protein is phosphorylated after transformation by avian sarcoma viruses with unrelated transforming genes. Mol Cell Biol. 1981 Jan;1(1):43–50. doi: 10.1128/mcb.1.1.43. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Erikson E., Erikson R. L. Identification of a cellular protein substrate phosphorylated by the avian sarcoma virus-transforming gene product. Cell. 1980 Oct;21(3):829–836. doi: 10.1016/0092-8674(80)90446-8. [DOI] [PubMed] [Google Scholar]
  11. Erikson R. L., Collett M. S., Erikson E., Purchio A. F. Evidence that the avian sarcoma virus transforming gene product is a cyclic AMP-independent protein kinase. Proc Natl Acad Sci U S A. 1979 Dec;76(12):6260–6264. doi: 10.1073/pnas.76.12.6260. [DOI] [PMC free article] [PubMed] [Google Scholar]
  12. Garrels J. I. Two dimensional gel electrophoresis and computer analysis of proteins synthesized by clonal cell lines. J Biol Chem. 1979 Aug 25;254(16):7961–7977. [PubMed] [Google Scholar]
  13. Hunter T., Sefton B. M. Transforming gene product of Rous sarcoma virus phosphorylates tyrosine. Proc Natl Acad Sci U S A. 1980 Mar;77(3):1311–1315. doi: 10.1073/pnas.77.3.1311. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Levinson A. D., Oppermann H., Levintow L., Varmus H. E., Bishop J. M. Evidence that the transforming gene of avian sarcoma virus encodes a protein kinase associated with a phosphoprotein. Cell. 1978 Oct;15(2):561–572. doi: 10.1016/0092-8674(78)90024-7. [DOI] [PubMed] [Google Scholar]
  15. O'Farrell P. H. High resolution two-dimensional electrophoresis of proteins. J Biol Chem. 1975 May 25;250(10):4007–4021. [PMC free article] [PubMed] [Google Scholar]
  16. Oppermann H., Levinson A. D., Levintow L., Varmus H. E., Bishop J. M., Kawai S. Two cellular proteins that immunoprecipitate with the transforming protein of Rous sarcoma virus. Virology. 1981 Sep;113(2):736–751. doi: 10.1016/0042-6822(81)90202-6. [DOI] [PubMed] [Google Scholar]
  17. Oppermann H., Levinson A. D., Varmus H. E., Levintow L., Bishop J. M. Uninfected vertebrate cells contain a protein that is closely related to the product of the avian sarcoma virus transforming gene (src). Proc Natl Acad Sci U S A. 1979 Apr;76(4):1804–1808. doi: 10.1073/pnas.76.4.1804. [DOI] [PMC free article] [PubMed] [Google Scholar]
  18. Oppermann H., Levinson W., Bishop J. M. A cellular protein that associates with the transforming protein of Rous sarcoma virus is also a heat-shock protein. Proc Natl Acad Sci U S A. 1981 Feb;78(2):1067–1071. doi: 10.1073/pnas.78.2.1067. [DOI] [PMC free article] [PubMed] [Google Scholar]
  19. Parry G., Bartholomew J. C., Bissell M. J. Role of src gene in growth regulation of Rous sarcoma virus-infected chicken embryo fibroblasts. Nature. 1980 Dec 25;288(5792):720–722. doi: 10.1038/288720a0. [DOI] [PubMed] [Google Scholar]
  20. Pawson T., Guyden J., Kung T. H., Radke K., Gilmore T., Martin G. S. A strain of Fujinami sarcoma virus which is temperature-sensitive in protein phosphorylation and cellular transformation. Cell. 1980 Dec;22(3):767–775. doi: 10.1016/0092-8674(80)90553-x. [DOI] [PubMed] [Google Scholar]
  21. Purchio A. F., Erikson E., Brugge J. S., Erikson R. L. Identification of a polypeptide encoded by the avian sarcoma virus src gene. Proc Natl Acad Sci U S A. 1978 Mar;75(3):1567–1571. doi: 10.1073/pnas.75.3.1567. [DOI] [PMC free article] [PubMed] [Google Scholar]
  22. Radke K., Gilmore T., Martin G. S. Transformation by Rous sarcoma virus: a cellular substrate for transformation-specific protein phosphorylation contains phosphotyrosine. Cell. 1980 Oct;21(3):821–828. doi: 10.1016/0092-8674(80)90445-6. [DOI] [PubMed] [Google Scholar]
  23. Radke K., Martin G. S. Transformation by Rous sarcoma virus: effects of src gene expression on the synthesis and phosphorylation of cellular polypeptides. Proc Natl Acad Sci U S A. 1979 Oct;76(10):5212–5216. doi: 10.1073/pnas.76.10.5212. [DOI] [PMC free article] [PubMed] [Google Scholar]
  24. Radke K., Martin G. S. Transformation by Rous sarcoma virus: effects of src-gene expression on the synthesis and phosphorylation of cellular polypeptides. Cold Spring Harb Symp Quant Biol. 1980;44(Pt 2):975–982. doi: 10.1101/sqb.1980.044.01.105. [DOI] [PubMed] [Google Scholar]
  25. Rohrschneider L. R., Eisenman R. N., Leitch C. R. Identification of a Rous sarcoma virus transformation-related protein in normal avian and mammalian cells. Proc Natl Acad Sci U S A. 1979 Sep;76(9):4479–4483. doi: 10.1073/pnas.76.9.4479. [DOI] [PMC free article] [PubMed] [Google Scholar]
  26. Sefton B. M., Beemon K., Hunter T. Comparison of the expression of the src gene of Rous sarcoma virus in vitro and in vivo. J Virol. 1978 Dec;28(3):957–971. doi: 10.1128/jvi.28.3.957-971.1978. [DOI] [PMC free article] [PubMed] [Google Scholar]
  27. Sefton B. M., Hunter T., Ball E. H., Singer S. J. Vinculin: a cytoskeletal target of the transforming protein of Rous sarcoma virus. Cell. 1981 Apr;24(1):165–174. doi: 10.1016/0092-8674(81)90512-2. [DOI] [PubMed] [Google Scholar]
  28. Sefton B. M., Hunter T., Beemon K., Eckhart W. Evidence that the phosphorylation of tyrosine is essential for cellular transformation by Rous sarcoma virus. Cell. 1980 Jul;20(3):807–816. doi: 10.1016/0092-8674(80)90327-x. [DOI] [PubMed] [Google Scholar]
  29. Sefton B. M., Hunter T., Beemon K. Product of in vitro translation of the Rous sarcoma virus src gene has protein kinase activity. J Virol. 1979 Apr;30(1):311–318. doi: 10.1128/jvi.30.1.311-318.1979. [DOI] [PMC free article] [PubMed] [Google Scholar]
  30. Sefton B. M., Hunter T., Beemon K. Temperature-sensitive transformation by Rous sarcoma virus and temperature-sensitive protein kinase activity. J Virol. 1980 Jan;33(1):220–229. doi: 10.1128/jvi.33.1.220-229.1980. [DOI] [PMC free article] [PubMed] [Google Scholar]
  31. Ushiro H., Cohen S. Identification of phosphotyrosine as a product of epidermal growth factor-activated protein kinase in A-431 cell membranes. J Biol Chem. 1980 Sep 25;255(18):8363–8365. [PubMed] [Google Scholar]

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