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Related Experiment Videos

Internal electrostatic potentials in bilayers: measuring and controlling dipole potentials in lipid vesicles

J C Franklin1, D S Cafiso

  • 1Department of Chemistry, University of Virginia, Charlottesville 22901.

Biophysical Journal
|July 1, 1993
PubMed
Summary

The membrane dipole potential significantly affects how hydrophobic ions bind and move across phosphatidylcholine vesicles. Molecules like phloretin and 6-ketocholestanol can alter this potential, influencing ion transport.

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Area of Science:

  • Membrane biophysics
  • Physical chemistry
  • Electrostatics

Background:

  • Phosphatidylcholine vesicles exhibit a membrane dipole potential.
  • This potential influences the movement and binding of hydrophobic ions.
  • Understanding these electrostatic effects is crucial for membrane transport studies.

Purpose of the Study:

  • To quantify the impact of membrane dipole potential on hydrophobic ion binding and translocation rates.
  • To investigate the effects of phloretin and 6-ketocholestanol on membrane dipole potential.
  • To validate an electrostatic model for predicting ion transport in membranes.

Main Methods:

  • Measurement of binding and translocation rates of hydrophobic cation and anion spin labels.
  • Utilizing unilamellar vesicle systems composed of phosphatidylcholine.

Related Experiment Videos

  • Analysis using a simple electrostatic model and a point dipole model.

    • Main Results:

    • Hydrophobic ion binding and translocation rates are dramatically different for oppositely charged ions due to membrane dipole potential.
    • Phloretin reduces dipole potential, increasing cation translocation and decreasing anion translocation.
    • 6-ketocholestanol increases dipole potential, causing opposite effects on ion translocation compared to phloretin.

    Conclusions:

    • The membrane dipole potential in phosphatidylcholine vesicles is approximately 280 mV.
    • Phloretin and 6-ketocholestanol can modulate the membrane dipole potential, altering ion transport.
    • A point dipole model accurately describes these electrostatic interactions, enabling dipole potential estimation.