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Crystal structure of human vinculin.

Robert A Borgon1, Clemens Vonrhein, Gerard Bricogne

  • 1Department of Hematology-Oncology, St. Jude Children's Research Hospital, 332 N. Lauderdale Street, Memphis, TN 38105, USA.

Structure (London, England : 1993)
|July 10, 2004
PubMed
Summary

Researchers determined the full-length vinculin structure, revealing a flexible, loosely packed arrangement. This structure explains how vinculin interacts with multiple proteins at cell adhesion sites.

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Area of Science:

  • Cell Biology
  • Structural Biology
  • Biochemistry

Background:

  • Vinculin orchestrates actin cytoskeleton alterations at cell-matrix and cell-cell junctions.
  • Vinculin's flexibility, due to interactions between its head (Vh) and tail (Vt) domains, facilitates dynamic adhesion complex formation.
  • Previous structural data only covered Vh and Vt domains, leaving the central region's structure and function unknown.

Purpose of the Study:

  • To determine the crystal structure of full-length human vinculin.
  • To elucidate the structural basis for vinculin's flexibility and its role in protein interactions at adhesion sites.

Main Methods:

  • X-ray crystallography was used to determine the structure of full-length human vinculin.
  • The crystal structure was resolved to 2.85 A resolution.

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Main Results:

  • The resting state structure of full-length vinculin was revealed as a loosely packed assembly of alpha-helical bundles.
  • Intramolecular interactions between the vinculin head (Vh) and tail (Vt) domains hold the structure together.
  • Three novel, ordered alpha-helical bundle domains (Vh2, Vh3, Vt2) were identified, structurally resembling Vh and Vt domains.
  • The loose packing of these domains provides the flexibility necessary for vinculin's interactions with diverse protein partners.

Conclusions:

  • The determined structure of full-length vinculin provides insights into its resting state conformation.
  • The flexible, loosely packed nature of vinculin, explained by its novel domain arrangement, is crucial for its function in cell adhesion.
  • This structural understanding facilitates further investigation into vinculin's role in cytoskeletal regulation and signaling pathways.