PROPERTIES OF CALCIUM PUMPING ATPASE

  • Strehler, Emanuel E, (PI)
  • Penniston, John (PI)

Project: Research project

Description

Studies on the relationship between structure and function in the Ca2+
pumping ATPase of plasma membranes will be continued. These Ca2+ pumps
exist in the plasma membranes of heart, smooth muscle, kidney, brain,
intestinal epithelium, erythrocyte and many other cell types. They are
involved in control of intracellular Ca2+ levels in cells of all kinds,
and in movement of Ca2+ across epithelial cell layers such as the
intestinal and kidney tubule epithelium. Information about the regulation
of these pumps may thus give information relevant to hypertension and
kidney disease, among other conditions. The pump consists of a single polypeptide chain of molecular weight of
about 135,000 (the exact molecular weight depends on the isoform). We
have succeeded in expressing this pump in COS cells and have developed an
assay system for determining the activity of the expressed enzyme. We
propose studies designed to extend our knowledge of the function of the
different parts of this enzyme. The structure-function relationships will
be mapped both by site-directed mutagenesis (utilizing the COS cell
system) and by the use of synthetic peptides, whose addition modifies the
activity of the pump. We will use these two techniques in combination on
the same portion of the pump molecule. This coordinated use of two
independent techniques will provide more reliable results, and increase
our ability to verify that changes introduced into the molecule have not
caused large scale alterations, in its conformation.
StatusFinished
Effective start/end date8/1/801/31/08

Funding

  • National Institutes of Health: $314,600.00
  • National Institutes of Health: $314,600.00
  • National Institutes of Health: $307,207.00

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Calcium-Transporting ATPases
Calcium
Ions
Protein Isoforms
Calmodulin
Molecular Weight
4-Nitrophenylphosphatase
Ion Pumps
Cell Membrane
Kidney Tubules
COS Cells
Kidney Diseases
Enzymes
Intestinal Mucosa
Smooth Muscle
Insects
Adenosine Triphosphatases
Myocardium
Epithelium
Erythrocytes

ASJC

  • Medicine(all)
  • Biochemistry, Genetics and Molecular Biology(all)