We are investigating the mechanism of cell transformation by Rous sarcoma virus (RSV) and how the events in these cells relate to those induced by other avian sarcome viruses. The relationship between protein phosphorylation and viral transformation will also be compared to theprotein phosphorylation events associated with the response of cells to epidermal growth factor (EGF). The work proposed includes 1) biochemical characterization of the Rous sarcoma virus transforming gene product, pp60(src), and its normal cell homologue, pp60(c-src), as protein kinases as well as a search for other biochemical functions; 2) characterication of these proteins as phosphoproteins and how they intereact with other cellular protein kinases; 3) comparative functional analysis of pp60(src) and pp60(c-src); 4) identification and characterization of pp60(src)/pp60(c-src) substrates; and 5) biochemical characterization of the protein kinase activity associated with other viral trnasforming gene products and with the response of cells to EGF. These experiments bear directly on the health-related problem of oncongenesis. We shall utilize a) ion-exchange and immunoaffinity techniques for protein purification, b) molecular cloning and DNA transfection techniques, c) two-dimensional and conventional slab gel polyacrylamide gel electrophoresis of proteins, d) immunoprecipitation, and e) conditional and non-conditional mutants of RSV.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA034943-05
Application #
3172735
Study Section
Virology Study Section (VR)
Project Start
1982-09-01
Project End
1987-02-28
Budget Start
1986-03-01
Budget End
1987-02-28
Support Year
5
Fiscal Year
1986
Total Cost
Indirect Cost
Name
Harvard University
Department
Type
Schools of Arts and Sciences
DUNS #
071723621
City
Cambridge
State
MA
Country
United States
Zip Code
02138
Blenis, J; Chung, J; Erikson, E et al. (1991) Distinct mechanisms for the activation of the RSK kinases/MAP2 kinase/pp90rsk and pp70-S6 kinase signaling systems are indicated by inhibition of protein synthesis. Cell Growth Differ 2:279-85
Jones, S W; Erikson, R L; Ingebritsen, V M et al. (1989) Phosphotyrosyl-protein phosphatases. I. Separation of multiple forms from bovine brain and purification of the major form to near homogeneity. J Biol Chem 264:7747-53
Bedard, P A; Balk, S D; Gunther, H S et al. (1987) Repression of quiescence-specific polypeptides in chicken heart mesenchymal cells transformed by Rous sarcoma virus. Mol Cell Biol 7:1450-8
Blenis, J; Erikson, R L (1986) Regulation of protein kinase activities in PC12 pheochromocytoma cells. EMBO J 5:3441-7
Blenis, J; Erikson, R L (1986) Stimulation of ribosomal protein S6 kinase activity by pp60v-src or by serum: dissociation from phorbol ester-stimulated activity. Proc Natl Acad Sci U S A 83:1733-7
Resh, M D; Erikson, R L (1985) Highly specific antibody to Rous sarcoma virus src gene product recognizes a novel population of pp60v-src and pp60c-src molecules. J Cell Biol 100:409-17
Resh, M D; Erikson, R L (1985) Development and characterization of antisera specific for amino- and carboxy-terminal regions of pp60src. J Virol 55:242-5
Resh, M D; Erikson, R L (1985) Characterization of pp60src phosphorylation in vitro in Rous sarcoma virus-transformed cell membranes. Mol Cell Biol 5:916-22
Sugimoto, Y; Erikson, R L (1985) Phosphatidylinositol kinase activities in normal and Rous sarcoma virus-transformed cells. Mol Cell Biol 5:3194-8
Sugimoto, Y; Erikson, E; Graziani, Y et al. (1985) Inter- and intramolecular interactions of highly purified Rous sarcoma virus-transforming protein, pp60v-src. J Biol Chem 260:13838-43

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