The long-term objective of the proposed research is to determine the mechanisms utilized by the ubiquitous intracellular Ca2+ receptor, calmodulin (CaM) to activate members of the multifunctional Ca2+/CaM dependent protein kinase family and the physiological roles played by the signal transduction cascades in which these kinases are components. A CaM kinase cascade is defined as a Ca2+-initiated signaling pathway in which a CaM kinase kinase (CaMKK) phosphorylates and activates a CaM kinase (CaM KlV or CaMKl) in a manner that culminates in execution of a key cellular response. CaMKIV is a nuclear enzyme involved in cell differentiation. A thorough evaluation of the signaling events responsible for the spatiotemporal regulation of CaMKIV in mammalian cells will be undertaken. This includes identification of sequences in CaMKIV required for nuclear localization, determination of the events and/or protein associations required for nuclear import, the compartment of the cell in which CaMKK phosphorylates CaMKIV and evaluation of the signaling events that mark CaMKIV for nuclear export and degradation in response to hormonal stimulation of ovarian granulosa cells that results in differentiation. Since CaM kinases are essential for cell cycle progression, effort will be focused on the roles of this pathway in regulation of entry into DNA synthesis (G1/S) in Aspergillus nidulans and WI 38 human diploid fibroblasts. A genetic suppressor screen of a CaMKK mutant strain that is delayed in activation of the cyclin/cdk step required for S phase entry will be used to identify components (including substrates) of the CaM kinase cascade involved in G1/S progression in A. nidulans. To complement this approach, a novel proteomics strategy is proposed to identify substrates of the CaM kinase cascade in this fungus. To address the requirement for a CaM kinase in G1/ progression in mammalian cells, it is proposed to identify the CaM kinase necessary for activation of the nuclear cyclin D/cdk4 complex and address the mechanism by which this activation occurs.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
3R01GM033976-22S1
Application #
7251741
Study Section
Biochemistry Study Section (BIO)
Program Officer
Ikeda, Richard A
Project Start
1984-07-01
Project End
2007-05-31
Budget Start
2005-07-01
Budget End
2007-05-31
Support Year
22
Fiscal Year
2006
Total Cost
$129,583
Indirect Cost
Name
Duke University
Department
Pharmacology
Type
Schools of Medicine
DUNS #
044387793
City
Durham
State
NC
Country
United States
Zip Code
27705
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