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Related Experiment Videos

A novel structural model for regulation of clathrin function

B Pishvaee1, A Munn, G S Payne

  • 1Department of Biological Chemistry, UCLA School of Medicine, Los Angeles, CA 90095, USA.

The EMBO Journal
|May 1, 1997
PubMed
Summary

Investigating yeast clathrin heavy chain (Chc) and light chain (Clc) interactions, this study reveals how mutations affect their binding. A new model proposes Clc bridges Chc domains, impacting clathrin assembly and vesicle formation.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Structural Biology

Background:

  • Clathrin forms polyhedral lattices essential for clathrin-coated vesicle formation.
  • The triskelion structure of clathrin heavy chain (Chc) is key to its assembly.
  • Clathrin light chain (Clc) is known to associate with Chc, but the precise interaction sites and regulatory mechanisms are not fully understood.

Purpose of the Study:

  • To characterize regions of the yeast Chc heavy chain gene (CHC1) involved in Chc trimerization and Clc binding.
  • To elucidate the structural basis for Clc's regulatory effects on clathrin function.

Main Methods:

  • Random and site-directed mutagenesis of the yeast CHC1 gene.
  • Analysis of mutant Chc proteins for trimerization properties and Clc binding affinity.

Related Experiment Videos

  • Structural analysis of mutation sites on the clathrin triskelion.

    • Main Results:

    • Mutations in the triskelion vertex (trimerization domain) and adjacent leg domain impact Clc binding.
    • One trimerization domain mutation enhances Clc association with Chc.
    • Combined mutations in trimerization and leg domains cause severe Clc binding defects while preserving trimerization.
    • Identified a specific surface region on the trimerization domain that directly interacts with Clc.

    Conclusions:

    • Clathrin light chain (Clc) likely extends into the clathrin heavy chain (Chc) trimerization domain from the leg domain, bridging these regions.
    • A new model for triskelion vertex organization is proposed, explaining Clc's regulatory role in clathrin function.
    • Understanding these interactions provides structural insights into the regulation of clathrin-mediated endocytosis.