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Related Experiment Videos

[Structure and function of symporter and antiporter]

T Tsuchiya1, T Shimamoto

  • 1Faculty of Pharmaceutical Sciences, Okayama University.

Nihon Rinsho. Japanese Journal of Clinical Medicine
|August 1, 1997
PubMed
Summary

This review covers sodium-coupled symporters and antiporters, including the Na+/glucose symporter (SGLT) and Na+/galactoside symporter (Me1B). Key regions and amino acids crucial for substrate and cation recognition in these transporters have been identified.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Physiology

Background:

  • Symporters and antiporters utilizing Na+ as a coupling cation are vital membrane transport proteins.
  • The sodium-glucose cotransporter (SGLT) family, with five known isoforms, is crucial for glucose absorption in animal cells.
  • Bacterial transporters like the Na+/galactoside symporter (Me1B) also play key roles in nutrient uptake.

Purpose of the Study:

  • To review the structure and function of Na+-coupled symporters and antiporters.
  • To highlight identified regions and amino acid residues critical for substrate and cation recognition.
  • To discuss identified amino acid substitutions in SGLT1 related to glucose-galactose malabsorption.

Main Methods:

  • Literature review of studies on symporter and antiporter structure-function relationships.

Related Experiment Videos

  • Analysis of identified key regions and amino acid residues in SGLT and Me1B.
  • Examination of genetic studies on SGLT1 mutations causing malabsorption.

    • Main Results:

    • Specific regions and amino acid residues important for substrate and cation binding in Na+-coupled transporters have been identified.
    • Five isoforms of the sodium-glucose cotransporter (SGLT) have been characterized in animal tissues.
    • Amino acid substitutions in SGLT1 linked to glucose-galactose malabsorption have been documented.

    Conclusions:

    • Understanding the structure-function relationships of Na+-coupled transporters is essential for elucidating transport mechanisms.
    • Identified key residues provide insights into substrate specificity and cation coupling.
    • Further research into transporter mutations can illuminate disease mechanisms and potential therapeutic targets.