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Related Experiment Videos

Functional expression of a cDNA encoding a human ecto-ATPase.

J Mateo1, T K Harden, J L Boyer

  • 1Department of Pharmacology, The School of Medicine, University of North Carolina, Chapel Hill, North Carolina, NC 27599, USA.

British Journal of Pharmacology
|October 8, 1999
PubMed
Summary
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Researchers cloned and functionally expressed a human ecto-ATPase, demonstrating its role in hydrolyzing extracellular nucleotides. This finding is crucial for understanding nucleotide signaling pathways mediated by P2 receptors.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Extracellular nucleotide metabolism is vital for P2 receptor-mediated nucleotide signaling.
  • The biological activity of the putative human ecto-ATPase CD39L1 remained uncharacterized.

Purpose of the Study:

  • To clone and characterize a human ecto-ATPase.
  • To investigate the enzymatic activity and substrate specificity of the expressed ecto-ATPase.

Main Methods:

  • Isolation of a human ecto-ATPase encoding sequence from ECV-304 cells.
  • Stable expression of the sequence in NIH-3T3 mouse fibroblasts.
  • Biochemical assays to determine nucleotide hydrolytic activity, substrate specificity, and kinetic parameters (Km, Vmax).

Main Results:

Related Experiment Videos

  • A 495 amino acid protein, an alternative splice form of CD39L1, was identified and functionally expressed.
  • The expressed protein exhibited significant ecto-ATPase activity, hydrolyzing nucleoside triphosphates dependent on Ca(2+) or Mg(2+).
  • Nucleoside diphosphate hydrolysis was observed at a much lower rate compared to triphosphates, with specific Km and Vmax values determined for ATP and ADP hydrolysis.

Conclusions:

  • The study reports the successful cloning and functional expression of a human ecto-ATPase.
  • Understanding the biochemical properties and regulation of this ecto-ATPase is essential for elucidating its role in nucleotide signaling.