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Fluorescence Resonance Energy Transfer Optomechanics Approach To Construct Intermolecular Domain Tension Probes for

Huawen Xu1,2, Chenyi Shou1,2, Ling Zhu1,2

  • 1State Key Laboratory on Technologies for Chinese Medicine Pharmaceutical Process Control and Intelligent Manufacture, Nanjing University of Chinese Medicine, Nanjing 210023, China.

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Summary

Researchers developed novel tension probes to study how cells sense and respond to mechanical forces, revealing insights into talin-microfilament interactions crucial for cell movement and development.

Keywords:
FRET biosensoravoiding gain-of-functionforce transductionintermolecular domain tension probestalin–microfilament

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Area of Science:

  • Mechanobiology
  • Cellular mechanics
  • Molecular biology

Background:

  • Integrin-talin-cytoskeleton interactions are vital for cellular processes like tumor metastasis and neural development.
  • Existing methods for studying these mechanics-related proteins face challenges with gene cloning and signal overactivation.

Purpose of the Study:

  • To develop novel intermolecular tension probes for investigating talin-microfilament force transduction.
  • To overcome limitations of gene cloning and protein overactivation in studying cellular mechanics.
  • To enable real-time monitoring of force transduction and cellular distribution in live cells.

Main Methods:

  • Utilized AlphaFold2 predictions to design talin/actin-binding domains for intermolecular tension probes.
  • Constructed probes comprising an EF domain and various actin-binding domains (SH3, PDZ, LIM, FERM).
  • Applied these probes to the talin-microfilament system to monitor force transduction in live cells.

Main Results:

  • Successfully developed and applied intermolecular tension probes, avoiding adverse effects of gene cloning and talin overactivation.
  • Demonstrated that talin-microfilament force transduction is dependent on specific actin-binding domains.
  • Showed that microfilament depolymerization can reverse tension increases induced by integrin activation.

Conclusions:

  • Developed optimized intermolecular domain tension probes for real-time fluorescence monitoring of force transduction.
  • These probes allow for force detection independent of direct protein function modulation.
  • The study provides new tools and insights into the mechanisms of mechanobiology.