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Related Experiment Videos

Modulation of agrin function by alternative splicing and Ca2+ binding.

Jörg Stetefeld1, Andrei T Alexandrescu, Mark W Maciejewski

  • 1Department of Biophysical Chemistry, University of Basel, Klingelbergstrasse 70, CH-4056 Basel, Switzerland. joerg.stetefeld@unibas.ch

Structure (London, England : 1993)
|March 16, 2004
PubMed
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Structural studies reveal how alternatively spliced agrin forms, crucial for neuromuscular junction development, interact with binding partners. Calcium binding influences the flexibility of the agrin-G3 domain

Area of Science:

  • Molecular Biology
  • Neuroscience
  • Structural Biology

Background:

  • Neuromuscular junction development relies on acetylcholine receptor aggregation.
  • Proteoglycan agrin, specifically its C-terminal G3 domain, plays a critical role.
  • Alternative splicing of agrin, introducing B-inserts, modulates its function.

Purpose of the Study:

  • To elucidate the structural basis of agrin's function in neuromuscular development.
  • To investigate how different agrin splice variants interact with binding partners.
  • To understand the role of the agrin-G3 domain's structure and flexibility.

Main Methods:

  • X-ray crystallography was used to determine the structures of neural agrin-G3 with B8 and B11 inserts.
  • Nuclear Magnetic Resonance (NMR) spectroscopy determined the structure of agrin-G3 lacking inserts (B0).

Related Experiment Videos

  • Structural analysis focused on the beta jellyroll fold and the flexible interaction interface.

    • Main Results:

    • The agrin-G3 domain adopts a beta jellyroll fold.
    • A flexible interaction interface, formed by flanking loops, was identified.
    • Calcium (Ca2+) binding was shown to reduce the flexibility of this interface.
    • Flexibility in the interaction interface may allow different agrin splice forms to bind diverse partners.

    Conclusions:

    • The structural plasticity of the agrin-G3 interaction interface is key to its function.
    • Alternative splicing and Ca2+ binding provide mechanisms for regulating agrin interactions.
    • These findings offer insights into the molecular mechanisms of neuromuscular junction formation.