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Related Experiment Videos

Galectin-4 and small intestinal brush border enzymes form clusters

E M Danielsen1, B van Deurs

  • 1Department of Medical Biochemistry and Genetics, Panum Institute, University of Copenhagen, Denmark.

Molecular Biology of the Cell
|November 15, 1997
PubMed
Summary

Galectin-4, an intestinal lectin, associates with brush border enzymes like aminopeptidase N and sucrase-isomaltase. This interaction anchors these proteins to the cell surface, influencing their secretion and function.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Gastroenterology

Background:

  • Transmembrane brush border enzymes, such as aminopeptidase N and sucrase-isomaltase, are localized in glycolipid-rich environments in the pig small intestine.
  • Galectin-4, an animal lectin, lacks a signal peptide for membrane translocation.

Purpose of the Study:

  • To investigate the localization and function of galectin-4 within the intestinal brush border.
  • To determine the relationship between galectin-4 and key brush border enzymes.

Main Methods:

  • Detergent-insoluble complex preparation and gradient centrifugation.
  • Immunoperoxidase cytochemistry and immunogold electron microscopy.
  • Subcellular fractionation, co-immunoprecipitation, and lactose-mediated release assays.

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Main Results:

  • Galectin-4 was found in detergent-insoluble complexes and formed distinct clusters with brush border enzymes.
  • Galectin-4 is localized to the intestinal brush border, microvilli, and intracellular structures.
  • Direct association between galectin-4 and aminopeptidase N/sucrase-isomaltase was confirmed; galectin-4 is extracellularly localized.

Conclusions:

  • Galectin-4 is secreted via a nonclassical pathway and binds to brush border enzymes, representing a novel class of ligands.
  • This association influences galectin-4's intracellular trapping and apical secretion, preventing its release into the intestinal lumen.
  • Galectin-4 plays a role in anchoring brush border enzymes to the enterocyte surface.