Cation-induced changes in the structure of lipid membranes
There has been a renewed interest in the studies of membrane structure and interaction properties in the presence of salt solutions. The divalent metal cations attract a special attention due to their peculiar properties. In spite of their importance however, their adsorption to membranes and their influence on lipid bilayers is far from being understood. We have detected previously a compacting effect of Ca2+ on the bacterial membrane structure. Its peculiarity seems to result from specific interactions with membrane. Intriguingly, a much lower specificity has been shown by Zn2+ ions that are also much smaller. These recent results suggest two parameters playing a key role in the mechanism of ion-membrane interaction. First, it is the size and hydration properties of ions themselves. Second, the specific interactions may depend on the density of lipid-ion interactions per lipid, thus correlating with the lipid lateral area. We propose to expand the previously examined divalent cations by Mg2+, which has a different size. The structural changes due to ions will be scrutinized for DPPC and DOPC oriented multilayers for addressing the effect of area per lipid.
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UHRIKOVA Daniela; DEME Bruno; ERMAKOVA Elena; KUCERKA Norbert; KUKLIN Alexander; TEIXEIRA Jose and ZELINSKA Katarina. (2018). Cation-induced changes in the structure of lipid membranes. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-13-748
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