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IgLONs form heterodimeric complexes on forebrain neurons.

Christine J McNamee1, Sahar Youssef, Diana Moss

  • 1Department of Human Anatomy and Cell Biology, Liverpool University, UK.

Cell Biochemistry and Function
|February 16, 2011
PubMed
Summary
This summary is machine-generated.

The Immunoglobulin-like domain containing, LGI family (IgLONs) proteins form heterodimeric complexes. This study demonstrates IgLONs are the first GPI-anchored glycoproteins shown to form heterodimers in the cell membrane.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Immunoglobulin-like domain containing, LGI family (IgLONs) are GPI-anchored cell adhesion molecules.
  • IgLONs regulate neurite outgrowth, synaptogenesis, and may function as tumor suppressors.
  • A heterodimeric complex termed DIgLON has been recently proposed.

Purpose of the Study:

  • To investigate the formation of heterodimeric complexes within the IgLON family.
  • To determine if IgLONs form complexes with each other in neurons.
  • To establish if IgLONs are the first GPI-anchored glycoproteins shown to form heterodimers.

Main Methods:

  • Utilized neurons isolated from chick forebrain.
  • Co-expressed all six combinations of IgLONs.
  • Performed antibody-patching experiments on forebrain neurons.

Main Results:

  • Neurons co-expressed all six IgLON combinations with highly correlated fluorescence intensity.
  • Antibody-patching confirmed complex formation between IgLON pairs.
  • No complex formation was observed between unrelated GPI-anchored glycoproteins.

Conclusions:

  • IgLONs are the first identified GPI-anchored glycoprotein family to form heterodimeric complexes.
  • IgLON heterodimerization occurs within the plane of the cell membrane.
  • This finding provides novel insights into the molecular mechanisms of IgLON function in neuronal development and potentially in cancer.