Fluid phase lipid areas and bilayer thicknesses of commonly used phosphatidylcholines as a function of temperature

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DOIResolve DOI: http://doi.org/10.1016/j.bbamem.2011.07.022
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TypeArticle
Journal titleBiochimica et Biophysica Acta
Volume1808
Issue11
Pages27612771; # of pages: 11
SubjectArea per lipid; Bilayer structure; Fluid phase; Neutron scattering; X-ray scattering; Phosphatidylcholine
AbstractThe structural parameters of fluid phase bilayers composed of phosphatidylcholines with fully saturated, mixed, and branched fatty acid chains, at several temperatures, have been determined by simultaneously analyzing small-angle neutron and X-ray scattering data. Bilayer parameters, such as area per lipid and overall bilayer thickness have been obtained in conjunction with intrabilayer structural parameters (e.g. hydrocarbon region thickness). The results have allowed us to assess the effect of temperature and hydrocarbon chain composition on bilayer structure. For example, we found that for all lipids there is, not surprisingly, an increase in fatty acid chain trans–gauche isomerization with increasing temperature. Moreover, this increase in trans–gauche isomerization scales with fatty acid chain length in mixed chain lipids. However, in the case of lipids with saturated fatty acid chains, trans–gauche isomerization is increasingly tempered by attractive chain–chain van der Waals interactions with increasing chain length. Finally, our results confirm a strong dependence of lipid chain dynamics as a function of double bond position along fatty acid chains.
Publication date
LanguageEnglish
AffiliationNRC Canadian Neutron Beam Centre; National Research Council Canada
Peer reviewedYes
NPARC number18593984
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Record identifier004d8b25-948a-4490-9fc2-127b470c45ad
Record created2011-11-10
Record modified2016-05-09
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