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Conformational activation of talin by RIAM triggers integrin-mediated cell adhesion

Jun Yang1, Liang Zhu2, Hao Zhang3

  • 1Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, Ohio 44195, USA.

Nature Communications
|December 19, 2014
PubMed

Insights

RIAM binds to talin

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Integrin activation is crucial for cell adhesion, migration, and proliferation.
  • Talin is a key cytoskeletal protein that links cell surface integrins to the actin cytoskeleton.
  • RIAM (Rap1-interacting adapter molecule) is known to bind talin's C-terminal domain (talin-R) and facilitate talin's membrane localization.

Purpose of the Study:

  • To investigate the interaction between RIAM and the N-terminal head domain of talin (talin-H).
  • To elucidate the role of RIAM-talin-H interaction in regulating talin's conformation and integrin activation.

Main Methods:

  • Systematic mapping analysis to identify RIAM binding sites on talin.
  • Biochemical assays to assess the effect of RIAM binding on talin-integrin interactions.
  • Functional experiments to demonstrate RIAM's role in triggering integrin activation.

Main Results:

  • RIAM binds to both talin-R and talin-H.
  • RIAM binding to talin-H sterically unmasks the integrin-binding site on talin.
  • This unmasking event triggers integrin activation.

Conclusions:

  • RIAM plays a novel role in regulating talin conformation through steric unmasking.
  • This mechanism is critical for initiating integrin activation and subsequent cellular adhesive responses.
  • Findings reveal a new pathway for controlling cell adhesion and migration.

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