Non-receptor protein tyrosine kinases (PTK's), Abl, Csk, Hck, and other Src family members, are central regulators of signal transduction and involved in multiple disease states, including many cancers and autoimmune syndromes. They share three highly homologous domains: an SH3 (Src homology 3) domain, an SH2 domain and a catalytic kinase domain. SH3 domains are involved in regulation of kinase activity in vitro and vivo. We propose structural characterization of the molecular mechanisms of SH3 domain control of the kinase activity using heteronuclear NMR coupled with protein segmental isotopic labeling. We will use chemical shift mapping and direct NMR structure determination to identify the intramolecular interaction surface between SH3 and catalytic domains of Csk which is likely to involve a novel mechanism of SH3/ligand recognition. Segmental isotopic labeling of SH3 domain within Abl SH(3,2,kinase) construct will be used to map the contacts of the SH3 with other parts of the molecule and assess structural modifications and changes in the presence of enzymatic and SH-related activators and inhibitors. We will conduct a broad survey of the solubility and association properties of Lek and Hck and other Src family members to establish the most likely practical candidate for future NMR studies. Based on the results of the survey, structural characterization of the SH3 autoinhibitory mechanisms in the active form of the Src-family of non-receptor tyrosine kinases will be conducted. The structural information derived from these studies will be important for understanding intramolecular mechanisms of kinase regulation and may represent a first step in designing highly specific therapeutic agents for regulating cellular PTK's activity.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
1F32CA088527-01
Application #
6209177
Study Section
Biophysical Chemistry Study Section (BBCB)
Program Officer
Lohrey, Nancy
Project Start
2000-09-01
Project End
Budget Start
2000-09-01
Budget End
2001-08-31
Support Year
1
Fiscal Year
2000
Total Cost
$30,916
Indirect Cost
Name
Rockefeller University
Department
Biochemistry
Type
Other Domestic Higher Education
DUNS #
071037113
City
New York
State
NY
Country
United States
Zip Code
10065