Summary
Proton and calcium permeability coefficients of large unilamellar vesicles made from natural complex mixtures of phospholipids were measured in various conditions and related to membrane fluidity. Permeability coefficients at neutral pH and 25°C were in the range of 104 cm sec1 and 2.5×1011 cm sec1 for protons and calcium, respectively. With the exception of two cases. (H+)>104 m and (Ca2+)>103 m, fluidity increases correspond to permeability increases. Theoretical analysis shows that, for both ions, the measured values of permeability coefficients imply that the permeation process is controlled by the productD 1 D 2 of the diffusion coefficient from the medium into the membrane (D 1) by the diffusion coefficient in the membrane (D 2). Further analysis ofD 1 values deduced from combined use of permeability and fluidity data shows that the solubilization should occur in a medium of dielectric constant of about 12, suggesting the involvement of the hydration water of membranes. High proton concentrations, although having virtually no effect on fluidity, trigger the appearance of (i) lateral heterogeneity in membranes, as seen by31P NMR, and (ii) large permeability increases. It is proposed that the main effect of fluidity and/or lateral heterogeneity on permeability may bevia the membrane hydration control. We conclude that the current assumption that permeability is controlled by fluidity should be regarded with caution, at least in the case of ions and natural mixtures of phospholipids.
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Rossignol, M., Uso, T. & Thomas, P. Relationship between fluidity and ionic permeability of bilayers from natural mixtures of phospholipids. J. Membrain Biol. 87, 269–275 (1985). https://doi.org/10.1007/BF01871227
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DOI: https://doi.org/10.1007/BF01871227