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Related Experiment Videos

Vinculin activation by talin through helical bundle conversion.

Tina Izard1, Gwyndaf Evans, Robert A Borgon

  • 1Department of Hematology-Oncology, St Jude Children's Research Hospital, Memphis, Tennessee 38105, USA. tina.izard@stjude.org

Nature
|January 2, 2004
PubMed
Summary
This summary is machine-generated.

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Vinculin, a key protein in cell adhesion, changes shape when talin binds to it. This structural shift activates vinculin, enabling it to connect cell junctions to the cytoskeleton and direct cellular responses.

Area of Science:

  • Cell Biology
  • Structural Biology
  • Biochemistry

Background:

  • Vinculin regulates cell-cell and cell-matrix junctions, anchoring them to the actin cytoskeleton.
  • It interacts with talin in focal adhesions and alpha-actinin in cadherin junctions.
  • In its inactive state, vinculin adopts a closed conformation via head (Vh) and tail (Vt) domain interactions.

Purpose of the Study:

  • To elucidate the structural mechanisms of vinculin activation by talin.
  • To understand how talin binding alters vinculin conformation and function.
  • To investigate the role of Vh domain conformational changes in cytoskeletal regulation.

Main Methods:

  • X-ray crystallography was used to determine the structures of human vinculin.
  • Structures were obtained for both inactive vinculin and vinculin in a talin-activated state.

Related Experiment Videos

  • Comparative structural analysis was performed to identify conformational changes.

    • Main Results:

    • Talin binding induces significant conformational changes in the Vh domain, forming a novel helical bundle.
    • This structural alteration in Vh actively displaces the Vt domain.
    • Alpha-actinin binding to Vh also displaces Vt, supporting a conserved activation mechanism.
    • Vh domain structural changes are crucial for directing cytoskeletal assembly at cell junctions.

    Conclusions:

    • Vinculin activation involves talin-induced Vh domain structural rearrangement and Vt displacement.
    • Helical bundle conversion in Vh serves as a signaling mechanism for protein-mediated cellular responses.
    • These findings provide insights into the regulation of cell adhesion and cytoskeletal dynamics.