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Related Experiment Videos

Structural requirements for neural cell adhesion molecule-heparin interaction.

A A Reyes1, R Akeson, L Brezina

  • 1Division of Basic Research, Children's Hospital Research Foundation, Cincinnati, Ohio 54229.

Cell Regulation
|July 1, 1990
PubMed
Summary

The heparin-binding domain (HBD) of neural cell adhesion molecule (NCAM) is crucial for both heparin binding and promoting retinal cell attachment. Mutations in the HBD significantly reduce NCAM

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Neuroscience

Background:

  • Neural cell adhesion molecule (NCAM) has two identified domains: a homophilic-binding domain for NCAM-NCAM interactions and a heparin-binding domain (HBD).
  • The structural independence and precise function of these domains in cell adhesion and heparin binding remain unclear.

Purpose of the Study:

  • To investigate the relationship between the heparin-binding domain (HBD) of NCAM and its role in cell adhesion.
  • To determine if the HBD is a distinct structural entity responsible for both heparin and cell binding.

Main Methods:

  • Construction of NCAM cDNAs with targeted mutations within the putative HBD.
  • Transfection of mouse fibroblast cells with wild-type and mutant NCAM cDNAs.
  • Analysis of heparin and retinal cell binding to purified mutant NCAM polypeptides.

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Main Results:

  • Mutant NCAM polypeptides with altered or deleted HBD showed significantly reduced heparin binding.
  • These mutant NCAMs failed to promote chick retinal cell attachment, unlike wild-type NCAM.
  • Synthetic peptides mimicking the HBD's basic regions were essential for inhibiting retinal cell adhesion to NCAM.

Conclusions:

  • The identified region of the NCAM polypeptide functions as a critical heparin-binding domain (HBD).
  • This HBD is essential for mediating a significant portion of NCAM's cell-adhesion capability.
  • The findings support the HBD as a distinct functional entity within the NCAM molecule.