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Real-Time Sub-Molecular Visualization of DNA Folding Using a Hybrid High-Speed AFM and Optical Tweezers System.

Kenichi Umeda1,2, Shin'nosuke Yamanaka3, Motonori Imamura1

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Researchers developed a hybrid high-speed atomic force microscopy (HS-AFM) and optical tweezers system to visualize biomolecular folding dynamics. This novel tool allows for precise force application and real-time imaging, revealing reversible DNA folding and unfolding mechanisms.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Nanotechnology

Background:

  • Optical tweezers are crucial for studying biomolecular folding mechanisms.
  • Current limitations include restricted structural information beyond fluorophore resolution.
  • Integrating force measurements with imaging is key for understanding force-coupled biochemical reactions.

Purpose of the Study:

  • To develop a hybrid system combining high-speed atomic force microscopy (HS-AFM) and optical tweezers.
  • To overcome instrumental incompatibility challenges for enhanced biomolecular analysis.
  • To visualize and understand the dynamics of DNA folding and unfolding under external forces.

Main Methods:

  • Developed a customized optical tweezers system optimized for HS-AFM.
  • Applied external forces to synthetic DNA secondary structures using the hybrid system.
  • Utilized molecular dynamics simulations and viscoelastic modeling for data analysis.

Main Results:

  • Direct visualization of DNA duplex dissociation and spontaneous reannealing.
  • Demonstrated reversible control over DNA folding and unfolding.
  • Captured reversible DNA overstretching and transient secondary structure formation in single-stranded DNA (ssDNA).

Conclusions:

  • The hybrid HS-AFM and optical tweezers system offers a powerful platform for studying biomolecular folding dynamics.
  • This integrated approach enables detailed investigation of force-coupled mechanisms in biomolecules.
  • The system provides unprecedented insights into reversible structural transitions in DNA.