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Related Experiment Video

Updated: Jul 24, 2026

Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
07:38

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Structure-function of recombinant Na/H exchanger regulatory factor (NHE-RF)

E J Weinman1, D Steplock, K Tate

  • 1Department of Medicine, West Virginia University School of Medicine, Morgantown, West Virginia 26506, USA. eweinman@wvudeptmed1.hsc.wvu.edu

The Journal of Clinical Investigation
|May 29, 1998
PubMed
Summary

The Na/H exchanger-regulatory factor (NHE-RF) protein inhibits renal sodium-hydrogen exchange. Protein kinase A (PKA) enhances this inhibition, with specific serine residues on NHE-RF acting as key phosphorylation sites.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • The renal brush border membrane (BBM) Na/H exchanger is crucial for ion transport.
  • cAMP-dependent protein kinase (PKA) regulates this exchanger via Na/H exchanger-regulatory factor (NHE-RF).
  • NHE-RF contains duplicated PDZ domains and potential PKA phosphorylation sites.

Purpose of the Study:

  • To investigate the structure-function relationship between NHE-RF and PKA-mediated inhibition of the rabbit BBM Na/H exchanger.
  • To identify the specific domains and phosphorylation sites on NHE-RF responsible for PKA regulation.
  • To elucidate the mechanism by which NHE-RF modulates Na/H exchange activity.

Main Methods:

  • Reconstitution assay using a fraction of rabbit BBM proteins with Na/H exchanger activity.
  • Testing full-length, truncated, and mutant forms of recombinant NHE-RF.
  • Evaluating the effects of PKA, ATP, and Mg on Na/H exchange activity in the presence of different NHE-RF constructs.

Main Results:

  • NHE-RF inhibited basal Na/H exchange activity in a concentration-dependent manner.
  • PKA significantly enhanced NHE-RF's inhibitory effect, causing a left shift in the dose-response curve.
  • Mutation of serine residues 287, 289, and 290 abolished the PKA-mediated enhancement, indicating these are critical phosphorylation sites.

Conclusions:

  • NHE-RF is an inhibitor of basal rabbit renal BBM Na/H exchange activity.
  • PKA augments NHE-RF's inhibitory function through phosphorylation of serine residues 287, 289, and/or 290.
  • The NH2-terminal PDZ domain of NHE-RF is essential for its full inhibitory effect and PKA-mediated regulation.