This project concerns the membrane proteins -- receptors and ion channels -- that underlie cellular excitability. In the next project period, VV will be exploited as a new system for the heterologous expression of these proteins in the membrane of mammalian and avian cells. 1. Vaccinia affords a new system for studying the 7-helix receptor-G protein interactions and the ion channel pathway, which employs direct coupling rather than soluble second messengers. Experiments will therefore work toward a complete reconstitution of this pathway. As a first step, the serotonin 5-HT-1A receptor will be expressed in primary cultures of cardiac atrial cells (chicks or guinea-pigs). It is expected that it will couple to the existing G protein(s), which in turn will activate K+ channels. Quantitative studies will follow. 2. It is of interest to understand the molecular basis for the diversity of voltage-dependent Ca++ channels from rat brain. Efforts will be continued to construct full-length clones for four classes of putative voltage-dependent Ca++ channels from rat brain. These clones will then be expressed in mammalian cell lines using VV and electrophysiological testing. Site-directed mutagenesis will follow. 3. Milligram quantities of channel proteins will be expressed and purified for structural studies.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM029836-12
Application #
3277536
Study Section
Neurological Sciences Subcommittee 1 (NLS)
Project Start
1981-04-01
Project End
1994-11-30
Budget Start
1992-12-01
Budget End
1993-11-30
Support Year
12
Fiscal Year
1993
Total Cost
Indirect Cost
Name
California Institute of Technology
Department
Type
Schools of Arts and Sciences
DUNS #
078731668
City
Pasadena
State
CA
Country
United States
Zip Code
91125
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