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Cooperative Vinculin Binding to Talin Mapped by Time-Resolved Super Resolution Microscopy.

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Talin unfolds as an antiparallel dimer, exposing binding sites. This stretching activates vinculin binding cooperatively, revealing new insights into focal adhesion dynamics.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Focal adhesions are crucial for cell adhesion and migration.
  • Talin is a key dimeric protein in focal adhesions, with cryptic binding sites exposed upon unfolding.

Purpose of the Study:

  • To investigate the in situ dynamics of talin dimer stretching.
  • To determine the structural changes in talin that lead to vinculin binding.
  • To understand the mechanism of vinculin recruitment to talin.

Main Methods:

  • Developed a novel method to monitor talin dimer stretch dynamics in situ.
  • Utilized vinculin tagged with DHFR-TMP Atto655 for binding studies.
  • Measured the separation of talin N-termini and C-terminal domains during stretching.

Main Results:

  • Talin N-termini separated by 162 ± 44 nm on average, while C-terminal domains colocalized.
  • Optimal vinculin and vinculin head binding occurred when talin was stretched to 180 nm.
  • Multiple vinculins bound rapidly and cooperatively to localized regions of the talin rod during stretching.

Conclusions:

  • Talin likely stretches as an antiparallel dimer.
  • Talin stretching activates vinculin binding in a cooperative manner.
  • This mechanism may involve stabilization of folded talin by other binding proteins.