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Resolving cargo-motor-track interactions with bifocal parallax single-particle tracking.

Xiaodong Cheng1, Kuangcai Chen1, Bin Dong1

  • 1Department of Chemistry, Georgia State University, Atlanta, Georgia.

Biophysical Journal
|December 28, 2020
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Summary

A new bifocal parallax single-particle tracking method reveals molecular motor dynamics in cells. This technique captures full 3D motion and rotation, uncovering new cargo-motor interactions in intracellular transport.

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Area of Science:

  • Cellular and Molecular Biophysics
  • Biomolecular Interactions and Dynamics
  • Nanobiotechnology

Background:

  • Understanding molecular nanomachines requires resolving biomolecular interactions within living cells.
  • Conventional tracking methods struggle to capture rotational dynamics crucial for motor function and binding status.
  • Rotational information is key to interpreting the work performed by molecular motors.

Purpose of the Study:

  • To develop a novel single-particle tracking method for real-time, full 3D motion and rotational analysis.
  • To investigate the dynamics of intracellular transport, including cargo-motor-track interactions.
  • To uncover previously unobserved interactions at microtubule intersections.

Main Methods:

  • Development of a bifocal parallax single-particle tracking method utilizing half-plane point spread functions.
  • Real-time acquisition of full-range azimuth angle (0-360°), polar angle, and 3D displacement.
  • Application of the method to analyze cargo motion within a 3D cell cytoskeleton under living conditions.

Main Results:

  • Quantitative rotational and translational motion of cargo in the 3D cell cytoskeleton was successfully obtained.
  • Observed well-known intracellular transport mechanisms, including active transport and free diffusion.
  • Discovered novel interactions: 'tight attachment' and 'tethered rotation' at microtubule intersections.

Conclusions:

  • The bifocal parallax method enables comprehensive real-time analysis of biomolecular dynamics in living cells.
  • New insights into cargo-motor-track interactions provide a deeper understanding of intracellular transport mechanisms.
  • The findings offer a more complete interpretation of molecular motor function and binding dynamics.