Cited by 578Lipid Membrane Structure and BehaviorIon Transport and Channel RegulationNanopore and Nanochannel Transport Studies

Permeation of protons, potassium ions, and small polar molecules through phospholipid bilayers as a function of membrane thickness

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Paula, S., Volkov, A.G., Van Hoek, A.N., Haines, T.H., Deamer, D.W.·1996·Biophysical Journal

Abstract

Two mechanisms have been proposed to account for solute permeation of lipid bilayers. Partitioning into the hydrophobic phase of the bilayer, followed by diffusion, is accepted by many for the permeation of water and other small neutral solutes, but transient pores have also been proposed to account for both water and ionic solute permeation. These two mechanisms make distinctively different predictions about the permeability coefficient as a function of bilayer thickness. Whereas the solubility-diffusion mechanism predicts only a modest variation related to bilayer thickness, the pore model predicts an exponential relationship. To test these models, we measured the permeability of phospholipid bilayers to protons, potassium ions, water, urea, and glycerol. Bilayers were prepared as liposomes, and thickness was varied systematically by using unsaturated lipids with chain lengths ranging from 14 to 24 carbon atoms. The permeability coefficient of water and neutral polar solutes displayed a modest dependence on bilayer thickness, with an approximately linear fivefold decrease as the carbon number varied from 14 to 24 atoms. In contrast, the permeability to protons and potassium ions decreased sharply by two orders of magnitude between 14 and 18 carbon atoms, and leveled off, when the chain length was further extended to 24 carbon atoms. The results for water and the neutral permeating solutes are best explained by the solubility-diffusion mechanism. The results for protons and potassium ions in shorter-chain lipids are consistent with the transient pore model, but better fit the theoretical line predicted by the solubility-diffusion model at longer chain lengths.

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  • The number of transient hydrated defects in lipid bilayers increases with decreasing membrane thickness.

    “Paula et al. [66] showed that the number of defects increased with decreasing membrane thickness, as might be expected.”

    From The Role of Lipid Membranes in Life’s Origin (2017) · cites this paper as [66]

  • Phospholipids with 14 carbon chains are much leakier to protons and potassium ions than those with 16 and 18 carbon chains.

    “Phospholipids having 14 carbon chains were much leakier to protons and potassium ions that those with 16 and 18 carbon chains, which is the chain length that is optimal for today’s cells living at moderate temperature ranges.”

    From The Role of Lipid Membranes in Life’s Origin (2017) · cites this paper as [66]

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Authors
Paula, S., Volkov, A. G., Van Hoek, A. N., Haines, T. H., & Deamer, D. W.
Affiliations
City University of New York (US)
Corresponding author
Paula, S.
Venue
Biophysical Journal
Publisher
Elsevier BV
Published
1996-01
Volume
70
Issue
1
Pages
339-348
ISSN
0006-3495 (ISSN-L)
OpenAlex
W2019036104
Cited by
578
References
44
Citations by year
2026: 9 · 2025: 12 · 2024: 20 · 2023: 15 · 2022: 20 · 2021: 21 · 2020: 17 · 2019: 31 · 2018: 23 · 2017: 30 · 2016: 23 · 2015: 27 · 2014: 26 · 2013: 15 · 2012: 22
FWCI
5.16
Type
journal article
Language
en
Open access
Locations
  • Biophysical Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Aeronautics and Space Administration
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Lipid Membrane Structure and Behavior
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion Transport and Channel Regulation
  • Physical Sciences › Engineering › Biomedical Engineering › Nanopore and Nanochannel Transport Studies
Keywords
membrane permeability, phospholipid bilayers, membrane thickness, proton permeation, potassium ion permeation, water permeation, urea, glycerol, unsaturated lipids, chain length, liposomes, permeability coefficient
MeSH terms
Biophysics, Diffusion, Glycerol, Lipid Bilayers, Models, Chemical, Permeability, Phospholipids, Potassium, Protons, Solubility, Urea, Water, Biophysical Phenomena

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