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Related Experiment Videos

Structure and function of laminin LG modules.

R Timpl1, D Tisi, J F Talts

  • 1Max-Planck-Institut für Biochemie, Am Klopferspitz 18a, D-82152, Martinsried, Germany. timpl@biochem.mpg.de

Matrix Biology : Journal of the International Society for Matrix Biology
|August 30, 2000
PubMed
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Laminin G domain-like (LG) modules, crucial for cell interactions, feature a novel calcium-binding site. This site and adjacent loops are key for binding heparin, sulfatides, and alpha-dystroglycan.

Area of Science:

  • Structural biology
  • Extracellular matrix proteins
  • Protein-ligand interactions

Background:

  • Laminin G domain-like (LG) modules are common in extracellular proteins, often arranged in tandem.
  • These modules mediate interactions with cellular receptors and sulfated carbohydrates.
  • Previous studies indicated the importance of LG modules in cell adhesion and signaling.

Purpose of the Study:

  • To elucidate the structural basis of ligand binding in laminin LG modules.
  • To identify the role of calcium ions in LG module structure and function.
  • To map binding sites for key extracellular ligands.

Main Methods:

  • X-ray crystallography of laminin alpha2 chain LG modules.
  • Site-directed mutagenesis to map ligand-binding epitopes.

Related Experiment Videos

  • Biochemical assays to confirm protein-ligand interactions.

    • Main Results:

    • Determined crystal structures revealing a compact beta sandwich fold for LG modules.
    • Identified a novel calcium-binding site within the LG module structure.
    • Mapped overlapping binding epitopes for heparin, sulfatides, and alpha-dystroglycan to surface loops near the calcium site.
    • Demonstrated that ligand binding often requires tandem LG modules and is influenced by structural constraints and proteolytic processing.

    Conclusions:

    • The structure of LG modules, including a novel calcium-binding site, provides a framework for understanding their diverse ligand interactions.
    • Ligand-binding epitopes are strategically located near the calcium site, suggesting a role for calcium in modulating binding.
    • Tandem arrangement and post-translational modifications like proteolytic processing are critical for efficient LG module function in the extracellular matrix.