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  • Title: Effect of the asymmetric Ca2+ distribution on the bilayer properties of phosphatidylcholine-sonicated vesicles.
    Author: Bakás LS, Disalvo EA.
    Journal: Biochim Biophys Acta; 1989 Mar 13; 979(3):352-60. PubMed ID: 2923889.
    Abstract:
    The incorporation of Ca2+ in the inner volume of egg phosphatidylcholine vesicles increases the fluorescence anisotropy of a diphenylhexatriene probe. This increase is higher than for Na+ at the same normality. An effect of the same magnitude is induced by Ca2+ when using binary lipid mixture (dioleoylphosphatidylcholine and dipalmitoylphosphatidylcholine) as long as the mixture is maintained below the phase-transition temperature of the saturated species. The influence of Ca2+ may be explained by an asymmetric distribution of the saturated and unsaturated lipids between the internal and the external monolayers.
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