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Multiple carbohydrate moieties on the Na+/H+ exchanger

R S Haworth1, O Fröhlich, L Fliegel

  • 1Department of Pediatrics, University of Alberta, Edmonton, Canada.

The Biochemical Journal
|February 1, 1993
PubMed
Summary
This summary is machine-generated.

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Researchers analyzed the carbohydrate structure of the sodium-hydrogen exchanger (NHE-1) in human placenta. Removing carbohydrates did not affect NHE-1 function or trypsin sensitivity, indicating it

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • The sodium-hydrogen exchanger (NHE-1) plays a crucial role in cellular pH regulation.
  • Understanding the structural and functional properties of NHE-1 is essential for cellular homeostasis.
  • The glycosylation status of membrane proteins can influence their function and stability.

Purpose of the Study:

  • To investigate the carbohydrate moiety of the human placental Na+/H+ exchanger (NHE-1).
  • To determine the type of glycosylation and its impact on NHE-1 function.
  • To characterize the N-linked carbohydrate structures present on NHE-1.

Main Methods:

  • Affinity-purified antibodies against NHE-1 were used for protein analysis.
  • Enzymatic digestion with glycopeptidase F, endoglycosidase-F, and neuraminidase was performed.

Related Experiment Videos

  • Analysis of protein mobility shifts via SDS-PAGE.
  • Assessment of Na+/H+ exchange activity and trypsin sensitivity.

    • Main Results:

    • Human placental NHE-1 has an apparent molecular mass of 105 kDa and is a glycoprotein.
    • Digestion with glycopeptidase F and endoglycosidase-F, but not endoglycosidase-H, altered mobility, suggesting biantennary complex N-linked glycosylation.
    • Deglycosylation did not affect Na+/H+ exchange activity or trypsin sensitivity.
    • Evidence for at least two to three N-linked carbohydrate moieties was found.

    Conclusions:

    • The human placental Na+/H+ exchanger (NHE-1) is a glycoprotein with biantennary complex N-linked carbohydrate structures.
    • The carbohydrate moiety of NHE-1 is not essential for its ion transport function or protease sensitivity.
    • These findings contribute to the understanding of NHE-1 structure-function relationships.