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Surface dielectric constant, surface hydrophobicity and membrane fusion

The Journal of Membrane Biology volume 114, pages 195–203 (1990)Cite this article

Summary

Membrane fusion induced by ions and its associated membrane property, surface dielectric constant, were studied with the use of acidic and neutral phospholipid vesicles. The fusion of vesicles was monitored by utilizing two fluorescence fusion assays: fluorescence content mixing method and fluorescence labelled membrane component dilution method. For the surface dielectric constant measurements, a fluorescence method was used which detected the environmental effect on the membrane surface upon the addition of various fusogenic cations. Also, the effects of poly-(ethylene glycol) on both fusion and surface dielectric properties were examined. It was found that the extent of fusion correlated well with the degree of lowering in the dielectric constant of the surface membrane, which corresponds to the increase in hydrophobicity of the membrane surface. This agrees with the previously obtained experimental results that the increase in interfacial tension of the membrane, which also corresponds to the increase in surface hydrophobicity, correlates with the extent of membrane fusion.

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Author notes

  1. K. Arnold

    Present address: Institute of Biophysics, Karl-Marx University, 7010, Leipzig, DDR

Affiliations

  1. Department of Biophysical Sciences, School of Medicine, State University of New York at Buffalo, 14214, Buffalo, New York

    S. Ohki & K. Arnold

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  1. S. Ohki
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Ohki, S., Arnold, K. Surface dielectric constant, surface hydrophobicity and membrane fusion. J. Membrain Biol. 114, 195–203 (1990). https://doi.org/10.1007/BF01869214

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  • DOI: https://doi.org/10.1007/BF01869214

Key Words

  • lipid vesicle fusion
  • surface dielectric constant
  • hydrophobicity
  • cations
  • poly-(ethylene glycol)