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Analyzing Telomeric Protein-DNA Interactions Using Single-Molecule Magnetic Tweezers
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Eukaryotic membrane tethers revisited using magnetic tweezers.

Basarab G Hosu1, Mingzhai Sun, Françoise Marga

  • 1Department of Biological Sciences, University of Missouri, Columbia, MO 65211, USA.

Physical Biology
|August 1, 2007
PubMed
Summary

Magnetic tweezers reveal that cell membrane tethers form en masse and exhibit complex viscoelastic properties. Careful interpretation is needed as different methods may probe distinct membrane structures.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biomaterials Science

Background:

  • Membrane nanotubes are crucial cellular structures that typically form in large numbers under physiological conditions.
  • Understanding the biophysical properties of these membrane tethers is essential for comprehending cell-cell communication and membrane dynamics.

Purpose of the Study:

  • To investigate the biophysical properties of membrane tethers extracted from human brain tumor cells using magnetic tweezers (MTW).
  • To compare tether properties derived from intact cells, cytoskeleton-disrupted cells, and Chinese hamster ovary cells.
  • To evaluate the influence of different tether extraction methods (MTW vs. atomic force microscopy) on observed properties.

Main Methods:

  • Utilized magnetic tweezers (MTW) to apply constant force and extract membrane tethers from cells via super-paramagnetic beads.

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  • Analyzed bead displacement-time profiles to identify discrete tether rupture events.
  • Employed scanning electron microscopy (SEM) for visual confirmation of multiple simultaneous tethers.
  • Applied standard viscoelasticity models to determine tether number and viscoelastic properties from bead trajectories.
  • Compared MTW results with those obtained from atomic force microscopy (AFM).

    • Main Results:

    • Observed multiple sudden jumps in bead velocity, indicative of successive individual tether ruptures.
    • SEM confirmed the simultaneous existence of multiple membrane tethers.
    • Determined physical characteristics, including number and viscoelastic properties, of extracted tethers.
    • Identified significant differences in tether formation characteristics between MTW and AFM methods.
    • Highlighted the potential for multiple nonspecific membrane tethers to form upon substrate attachment and pulling.

    Conclusions:

    • Extreme caution is advised when interpreting tether pulling experiments using single-molecule techniques (MTW, AFM, optical tweezers).
    • Different methods may probe distinct membrane structures with unique properties.
    • Distinguishing between specific and nonspecific tethers in physiological conditions is challenging due to the potential for mass formation.