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Human kidney amiloride-binding protein: cDNA structure and functional expression.

P Barbry1, M Champe, O Chassande

  • 1Institut de Pharmacologie Moléculaire et Cellulaire, Centre National de la Recherche Scientifique, Valbonne, France.

Proceedings of the National Academy of Sciences of the United States of America
|October 1, 1990
PubMed
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Researchers identified the human amiloride-binding protein, a glycoprotein crucial for epithelial sodium channel function. This discovery advances understanding of kidney ion transport and related diseases.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Nephrology

Background:

  • Amiloride is a potent blocker of epithelial sodium channels (ENaC).
  • Amiloride-binding proteins are implicated in kidney ion transport.
  • Previous studies utilized amiloride analogs to purify porcine kidney amiloride-binding protein.

Purpose of the Study:

  • To isolate and characterize the human amiloride-binding protein.
  • To determine the primary structure of the human amiloride-binding protein.
  • To confirm the functional properties and binding characteristics of the human amiloride-binding protein.

Main Methods:

  • Screening of a human kidney cDNA library using synthetic oligonucleotides.
  • DNA sequence analysis to deduce the primary protein structure.

Related Experiment Videos

  • Expression of mRNA in 293-S and NIH 3T3 cells for protein characterization.

    • Main Results:

    • Isolation of the cDNA encoding the human amiloride-binding protein.
    • The deduced protein is 713 residues long, including a 19-amino acid signal peptide.
    • Expressed glycoprotein binds amiloride and analogs with high affinity and is recognized by antibodies against the pig protein.

    Conclusions:

    • The human amiloride-binding protein is a glycoprotein with functional similarities to the porcine amiloride receptor.
    • This protein is likely involved in regulating epithelial sodium channel activity in the human kidney.
    • The findings provide a molecular basis for understanding amiloride's action and kidney physiology.