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Thiocyanate and bromide ions influence the bilayer structural parameters of phosphatidylcholine bilayers.

作者信息

Cunningham B A, Lis L J

出版信息

Biochim Biophys Acta. 1986 Oct 9;861(2):237-42. doi: 10.1016/0005-2736(86)90425-6.

DOI:10.1016/0005-2736(86)90425-6
PMID:3756158
Abstract

The influence of monovalent cations and anions on the structural parameters of dipalmitoylphosphatidylcholine (DPPC) bilayers was examined at 25 degrees C using X-ray diffraction. It was shown that monovalent salts, in general, have little effect on lipid packing within the bilayer. However, fully hydrated DPPC bilayers in 1 M KSCN pack in an interdigitated acyl chain phase. This is the first observation of an ion-induced interdigitated bilayer phase in a zwitterionic lipid. In addition, gel state DPPC bilayers in 1 M KBr imbibe approx. 10 A more solvent than bilayers in water. The influence of these same salts on the phase transitions of DPPC bilayers was also examined using high-resolution differential scanning calorimetry. These results are discussed in terms of ion-induced changes in solvent and solvent/bilayer structure.

摘要

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