This project is concerned with the mechanism of transformation by the non-receptor tyrosine kinase v-Src. Recent findings suggest a model in which transformation by v-Src involves multiple pathways, of which some are dependent on the Ras oncoprotein, while others are Ras-independent. According to this model, activation of different pathways is dependent on different structural features of v-Src, with the SH3 and SH2 domains of v-Src and the tyrosine autophosphorylation site each required for some but not all of the signaling pathways activated by Src. It is also suggested that the cell-type specificity of transformation results from differences in the signaling pathways active in different cell-types; thus Ras function is required for transformation by v-Src in some cell types, but not in others. This project is concerned with the identification of Ras-dependent and Ras-independent pathways involved in transformation by v-Src and with the structural features of v-Src necessary for activation of these pathways. The first specific aim concerns the role of Ras in transformation by v- Src. Experiments will be carried out to determine whether activation of Ras is necessary for fusiform transformation of CEF, and if so whether it is sufficient. The structural features of v-Src necessary for Ras activation will be examined, and their role in phosphorylation of substrates that may mediate Ras activation, such as Shc, will be determined. Further experiments will be carried out to characterize the role of known or suspected Ras effectors, such as RalGDS, PI-3-kinase and Raf, in Ras-dependent transformation by v-Src. The second specific aim concerns the role of specific signaling proteins in Ras-independent transformation by v-Src. Candidates include v-Src substrates such as c-Cbl and Cas, cytoplasmic signaling proteins such as PI-3-kinase and protein kinase C, and Src-activated transcription factors such as AP-1, Myc and Stat3. Experiments will be carried out to determine whether the activation of the pathway occurs when signaling through Ras is blocked, whether it occurs in cells expressing host range mutants of v-Src, and whether activation of the pathway or protein is necessary and/or sufficient for Ras-independent transformation. The third set of specific aims concerns the identification of novel signaling proteins and pathways that may mediate transformation by v- Src. A complementation screen will be carried out to detect genes that complement transformation-defective mutants of v-Src.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA017542-26
Application #
6328867
Study Section
Experimental Virology Study Section (EVR)
Program Officer
Cole, John S
Project Start
1978-12-01
Project End
2002-11-30
Budget Start
2000-12-01
Budget End
2001-11-30
Support Year
26
Fiscal Year
2001
Total Cost
$367,244
Indirect Cost
Name
University of California Berkeley
Department
Biochemistry
Type
Schools of Arts and Sciences
DUNS #
094878337
City
Berkeley
State
CA
Country
United States
Zip Code
94704
Gottlieb-Abraham, Efrat; Shvartsman, Dmitry E; Donaldson, John C et al. (2013) Src-mediated caveolin-1 phosphorylation affects the targeting of active Src to specific membrane sites. Mol Biol Cell 24:3881-95
Rodriguez, Elena M; Dunham, Elizabeth E; Martin, G Steven (2009) Atypical protein kinase C activity is required for extracellular matrix degradation and invasion by Src-transformed cells. J Cell Physiol 221:171-82
Shvartsman, Dmitry E; Donaldson, John C; Diaz, Begona et al. (2007) Src kinase activity and SH2 domain regulate the dynamics of Src association with lipid and protein targets. J Cell Biol 178:675-86
Zhu, Qingwei; Krakowski, Ariel R; Dunham, Elizabeth E et al. (2007) Dual role of SnoN in mammalian tumorigenesis. Mol Cell Biol 27:324-39
Jackson, William T; Martin, G Steven (2006) Transcription of the Schizosaccharomyces pombe gene cdc18+: roles of MCB elements and the DSC1 complex. Gene 369:100-8
Prathapam, Tulsiram; Tegen, Sarah; Oskarsson, Thordur et al. (2006) Activated Src abrogates the Myc requirement for the G0/G1 transition but not for the G1/S transition. Proc Natl Acad Sci U S A 103:2695-700
Berdeaux, Rebecca L; Diaz, Begona; Kim, Lomi et al. (2004) Active Rho is localized to podosomes induced by oncogenic Src and is required for their assembly and function. J Cell Biol 166:317-23
Martin, G Steven (2004) The road to Src. Oncogene 23:7910-7
He, Jun; Tegen, Sarah B; Krawitz, Ariel R et al. (2003) The transforming activity of Ski and SnoN is dependent on their ability to repress the activity of Smad proteins. J Biol Chem 278:30540-7
Webb, Brian L; Diaz, Begona; Martin, G Steven et al. (2003) A reporter system for reverse transfection cell arrays. J Biomol Screen 8:620-3

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