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Gramicidin channel kinetics under tension

M Goulian1, O N Mesquita, D K Fygenson

  • 1Center for Studies in Physics and Biology, Rockefeller University, New York, New York 10021, USA. goulian@menard.rockefeller.edu

Biophysical Journal
|February 4, 1998
PubMed
Summary

Membrane tension significantly impacts gramicidin A peptide dimerization. Increased tension accelerates dimer formation and extends dimer lifetime, explained by membrane elasticity models.

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Area of Science:

  • Biophysics
  • Membrane protein dynamics
  • Ion channel function

Background:

  • Gramicidin A forms channels in lipid bilayers.
  • Peptide dimerization is crucial for channel function.
  • Membrane properties can influence protein behavior.

Purpose of the Study:

  • To investigate the effect of membrane tension on gramicidin A dimerization kinetics.
  • To correlate electrical activity with membrane tension.
  • To model the observed tension-dependent dimerization.

Main Methods:

  • Utilizing micropipette aspiration of large unilamellar vesicles.
  • Simultaneously monitoring membrane tension and electrical activity.
  • Applying a phenomenological model of membrane elasticity.

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Main Results:

  • Dimer formation rate increased fivefold with tension (0-4 dyn/cm).
  • Dimer lifetime showed a positive correlation with increasing membrane tension.
  • Observed behavior aligns with models where tension affects peptide-membrane thickness mismatch.

Conclusions:

  • Membrane tension is a key regulator of gramicidin A dimerization.
  • Tension-induced changes in membrane elasticity influence peptide assembly.
  • Findings provide insights into ion channel gating and stability.