Cellular transformation and tumor formation by Rous sarcoma virus is dependent on the expression of the viral v-src gene. The product of this gene is a 60-kilodalton tyrosine protein kinase designated as v-Src. Likewise, the transforming gene of Abelson murine leukemia virus (which causes B-cell lymphomas in vivo) encodes a tyrosine protein kinase designated as v-Abl. This proposal focuses on the role of protein-protein interactions in the function of the v-Src and v-Abl tyrosine kinases. It has been suggested that the Src homology (SH) regions 2 and 3 of nonreceptor tyrosine kinases are important both in the regulation of kinase activity and in the recognition of cellular substrates. Regions of v-Src and v-Abl which are involved in intra- or intermolecular recognition will be identified by peptide-based photoaffinity labelling experiments. Peptide substrate analogs for these enzymes containing the photoactive amino acid p-benzoyl-Phe will be used as the affinity labels. Modified regions inside and outside the SH2 and SH3 domains will be studied further by site-directed mutagenesis, and the mutant enzymes will be tested by in vitro phosphorylation with tyrosine-containing synthetic peptides. These results will be correlated with a model of the three-dimensional structure of v-Src based on the recent crystal structure of the catalytic domain of the cAMP-dependent protein kinase. To identify determinants in protein substrates for v-Src which confer recognition by the wild-type and mutant enzymes, synthetic peptide """"""""libraries"""""""" will be used to select those peptides which give maximal phosphorylation by v-Src. Mutant v-Src kinases will be used to study in vivo substrate recognition. The model system for these studies will be Rat-1 cells transfected with v-Src constructs encoding kinases with altered specificity. Substrate recognition by the mutant enzymes will be assessed by three criteria: effects on total tyrosine phosphorylation, effects on phosphorylation of phospholipase C-gamma and other specific substrates, and effects on cellular transformation. The goal of these studies is to describe at a molecular level the steps leading to the formation of the """"""""signalling complexes"""""""" which play a central role in signal transduction and oncogenic transformation.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
3R01CA058530-09S1
Application #
6801317
Study Section
Medical Biochemistry Study Section (MEDB)
Program Officer
Knowlton, John R
Project Start
1993-09-01
Project End
2004-02-29
Budget Start
2002-03-01
Budget End
2004-02-29
Support Year
9
Fiscal Year
2003
Total Cost
$25,963
Indirect Cost
Name
State University New York Stony Brook
Department
Physiology
Type
Schools of Medicine
DUNS #
804878247
City
Stony Brook
State
NY
Country
United States
Zip Code
11794
Suga, Hiroshi; Miller, W Todd (2018) Src signaling in a low-complexity unicellular kinome. Sci Rep 8:5362
Delle Bovi, Richard J; Miller, W Todd (2017) Expression and purification of functional insulin and insulin-like growth factor 1 holoreceptors from mammalian cells. Anal Biochem 536:69-77
Cabail, M Zulema; Chen, Emily I; Koller, Antonius et al. (2016) Auto-thiophosphorylation activity of Src tyrosine kinase. BMC Biochem 17:13
Aleem, Saadat; Georghiou, George; Kleiner, Ralph E et al. (2016) Structural and Biochemical Basis for Intracellular Kinase Inhibition by Src-specific Peptidic Macrocycles. Cell Chem Biol 23:1103-1112
Fan, Gaofeng; Aleem, Saadat; Yang, Ming et al. (2015) Protein-tyrosine Phosphatase and Kinase Specificity in Regulation of SRC and Breast Tumor Kinase. J Biol Chem 290:15934-47
Yokoyama, Noriko; Miller, W Todd (2015) Molecular characterization of WDCP, a novel fusion partner for the anaplastic lymphoma tyrosine kinase ALK. Biomed Rep 3:9-13
Krishnan, Harini; Retzbach, Edward P; Ramirez, Maria I et al. (2015) PKA and CDK5 can phosphorylate specific serines on the intracellular domain of podoplanin (PDPN) to inhibit cell motility. Exp Cell Res 335:115-22
Touchette, Megan H; Bommineni, Gopal R; Delle Bovi, Richard J et al. (2015) Diacyltransferase Activity and Chain Length Specificity of Mycobacterium tuberculosis PapA5 in the Synthesis of Alkyl ?-Diol Lipids. Biochemistry 54:5457-68
Cabail, M Zulema; Li, Shiqing; Lemmon, Eric et al. (2015) The insulin and IGF1 receptor kinase domains are functional dimers in the activated state. Nat Commun 6:6406
Tsui, Tiffany; Miller, W Todd (2015) Cancer-Associated Mutations in Breast Tumor Kinase/PTK6 Differentially Affect Enzyme Activity and Substrate Recognition. Biochemistry 54:3173-82

Showing the most recent 10 out of 38 publications