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Related Experiment Videos

Force barriers for membrane tube formation.

Gerbrand Koster1, Angelo Cacciuto, Imre Derényi

  • 1FOM Institute for Atomic and Molecular Physics (AMOLF), Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.

Physical Review Letters
|March 24, 2005
PubMed
Summary

A force barrier is required to form membrane tubes from giant vesicles. This barrier increases with the pulling area

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Area of Science:

  • Biophysics
  • Soft Matter Physics
  • Cell Biology

Background:

  • Membrane tube formation is crucial for cellular processes.
  • Understanding the physical forces governing membrane dynamics is essential.

Purpose of the Study:

  • To quantify the force required for tube formation from giant vesicles.
  • To investigate the relationship between applied force and tube geometry.
  • To elucidate the mechanism of membrane tube formation.

Main Methods:

  • Utilized optical tweezers to measure force-extension curves.
  • Experimentally determined the force barrier for tube formation.
  • Employed Monte Carlo simulations for validation.
  • Performed theoretical calculations to model the process.

Main Results:

  • A significant force barrier was identified for membrane tube formation.
  • The force barrier scales linearly with the radius of the force application area.
  • Membrane tube formation proceeds via a first-order phase transition with hysteresis.
  • Experimental findings were corroborated by simulations and theory.

Conclusions:

  • Membrane tube formation is energetically constrained by a force barrier.
  • The geometry of force application critically influences tube formation.
  • Cellular membrane tube formation depends on specific force exertion mechanisms.

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