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Stalk dynamics and lipid flow upon membrane hemifusion.

D A Kumenko1, P I Kuzmin, Y A Chizmadzhev

  • 1Frumkin Institute of Electrochemistry, Russian Academy of Sciences, Moscow.

Membrane & Cell Biology
|August 5, 2000
PubMed
Summary

A new hydrodynamic theory models membrane hemifusion, determining intermonolayer viscosity (etar) for lipid bilayers in different solvents. This viscosity is crucial for understanding membrane fusion dynamics.

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Area of Science:

  • Biophysics
  • Membrane Biophysics
  • Hydrodynamics

Background:

  • Membrane hemifusion is a critical step in biological membrane fusion processes.
  • Understanding lipid flow and stalk dynamics during hemifusion is essential for elucidating fusion mechanisms.

Purpose of the Study:

  • To develop a hydrodynamic theory for stalk dynamics and lipid flows during BLM hemifusion.
  • To determine the intermonolayer viscosity (etar) of lipid membranes in different solvent environments.

Main Methods:

  • Development of a hydrodynamic theory for membrane hemifusion.
  • Experimental determination of intermonolayer viscosity (etar) using azolectin and lysophosphatidylcholine in n-decane.
  • Measurement of etar for phosphatidylethanolamine and azolectin in squalene.

Main Results:

  • Intermonolayer viscosity (etar) was determined for membranes in n-decane (azolectin/lysophosphatidylcholine) and squalene (phosphatidylethanolamine, azolectin).
  • Measured etar values were approximately 10(-9) g/s in n-decane and 10(-7) to 2x10(-7) g/s in squalene.
  • Theoretical calculations closely matched independent experimental results.

Conclusions:

  • The developed hydrodynamic theory accurately describes stalk growth and lipid flow during BLM hemifusion.
  • The determined intermonolayer viscosity values provide insights into membrane fusion mechanics.
  • The study validates the theoretical model's predictive power for membrane fusion processes.

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