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Three-Dimensional Two-Color Dual-Particle Tracking Microscope for Monitoring DNA Conformational Changes and

Yen-Liang Liu1,2,3, Evan P Perillo3,4, Phyllis Ang5,6

  • 1Graduate Institute of Biomedical Sciences, China Medical University, No.91, Hsueh-Shih Road, Taichung 40402, Taiwan.

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Summary
This summary is machine-generated.

A new three-dimensional two-color dual-particle tracking (3D-2C-DPT) method precisely tracks two distinct targets simultaneously. This technique quantifies DNA bending dynamics and nanoparticle interactions on cell membranes.

Keywords:
3D particle trackingDNA conformation changeantibody-receptor interactionsnanoscopic optical rulerrotational movement

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Molecular Biology

Background:

  • Precise tracking of nanoscale objects is crucial for understanding molecular dynamics.
  • Existing methods often lack the resolution or simultaneous multi-target capability needed for complex biological systems.

Purpose of the Study:

  • To develop and validate a novel three-dimensional two-color dual-particle tracking (3D-2C-DPT) technique.
  • To apply this technique to study DNA conformational changes and cell membrane interactions.

Main Methods:

  • Implementing 3D-2C-DPT for simultaneous localization of two spectrally distinct targets with high temporal resolution (5 ms).
  • Utilizing dsDNA-linked dimers as nanoscopic optical rulers to measure DNA bending dynamics.
  • Observing nanoparticle translational and rotational motion on living cell plasma membranes.

Main Results:

  • Achieved tracking precisions of ~15 nm (static) and ~35 nm (diffusing) for dual targets.
  • Quantified increased DNA bending rates (k_on) with varying dsDNA linker designs (1-nick, 3-nt, 6-nt, 9-nt gap).
  • Observed reduced nanoparticle rotations on cell membranes, suggesting interactions with receptors.

Conclusions:

  • The 3D-2C-DPT technique offers a powerful new tool for nanoscale biological research.
  • Demonstrated utility in characterizing biomolecular conformational changes and cell surface interactions.