Molecular-scale structure in fluid-gel patterned bilayers: Stability of interfaces and transmembrane distribution

被引:20
作者
Bennun, Sandra V. [1 ]
Longo, Marjorie L. [1 ]
Faller, Roland [1 ]
机构
[1] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA
关键词
D O I
10.1021/la701370t
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Variations in two-dimensional membrane structures on the molecular length scale are considered to have an effect on the mechanisms by which living cell membranes maintain their functionality. We created a molecular model of a patterned bilayer to asses the static and dynamic variations of membrane lateral and transbilayer distribution in two-component lipid bilayers on the molecular level. We study DSPC (distearoylphosphatidylcholine) nanometer domains in a fluid DLPC (dilauroylphosphatidylcholine) background. The system exhibits coexisting fluid and gel phases and is studied on a microsecond time scale. We characterize three different kinds of patterns: symmetric domains, asymmetric domains, and symmetric-asymmetric domains. Preferred bilayer configurations on the nanoscale are those that minimize the hydrophobic mismatch. We find nanoscale patterns to be dynamic structures with mainly lateral and rotational diffusion affecting their stability on the microsecond time scale.
引用
收藏
页码:12465 / 12468
页数:4
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