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Related Experiment Videos

Interactions between Na,K-ATPase alpha-subunit ATP-binding domains.

Charles J Costa1, Craig Gatto, Jack H Kaplan

  • 1Department of Biochemistry and Molecular Biology, Oregon Health and Science University, Portland, Oregon 97201, USA.

The Journal of Biological Chemistry
|January 4, 2003
PubMed
Summary

The sodium-potassium pump (Na,K-ATPase) alpha-subunit domains associate via the nucleotide-binding domain in the presence of MgATP. This interaction may influence cell function and protein interactions.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Physiology

Background:

  • The Na,K-ATPase (sodium-potassium pump) is crucial for cellular ion homeostasis.
  • Ligand-induced conformational changes are key to its mechanism, but details remain elusive.
  • Specific amino acid residues for ligand binding are known, yet domain interactions are poorly understood.

Purpose of the Study:

  • To investigate ligand-dependent interactions between Na,K-ATPase alpha-subunit domains.
  • To identify conformational changes induced by ligand binding.
  • To explore the role of the nucleotide-binding domain in these interactions.

Main Methods:

  • Overexpression of the major cytoplasmic loop (containing the ATP-binding domain) of Na,K-ATPase alpha-subunit in bacteria.

Related Experiment Videos

  • Purification of His(6) tag and glutathione S-transferase fusion proteins.
  • Assays for polypeptide association in the presence of MgATP, including inhibition studies with fluorescein isothiocyanate and eosin.

    • Main Results:

    • Overexpressed Na,K-ATPase polypeptides associated in the presence of MgATP.
    • This MgATP-induced association was inhibited by chemical modification (fluorescein isothiocyanate) and eosin, implicating the nucleotide-binding domain.
    • No phosphorylation occurred in the overexpressed fusion proteins, distinguishing this association from catalytic phosphorylation.

    Conclusions:

    • Data suggest Na,K-ATPase domains associate via the nucleotide-binding domain in response to MgATP.
    • These associations may play a role in cellular function and protein-protein interactions.
    • The functional significance for ion transport requires further investigation.