Biomimetic lipid/polymer colorimetric membranes: molecular and cooperative properties

被引:57
作者
Kolusheva, S
Wachtel, E
Jelinek, R [1 ]
机构
[1] Ben Gurion Univ Negev, Dept Chem, IL-84105 Beer Sheva, Israel
[2] Ben Gurion Univ Negev, Stadler Minerva Ctr Mesoscop Macromol Engn, IL-84105 Beer Sheva, Israel
[3] Weizmann Inst Sci, Chem Serv Unit, IL-76100 Rehovot, Israel
关键词
phospholipids; polydiacetylenes; small angle X-ray scattering; biosensors;
D O I
10.1194/jlr.M200136-JLR200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Characterization of membranes and of biological processes occurring within membranes is essential for understanding fundamental cellular behavior. Here we present a detailed biophysical study of a recently developed colorimetric biomimetic membrane assembly constructed from physiological lipid molecules and conjugated polydiacetylene. Various analytical techniques have been applied to characterize the organization of the lipid components in the chromatic vesicles and their contributions to the observed blue-to-red color transitions. Experiments reveal that both the polymerized units as well as the lipids exhibit microscopic phases and form domains whose properties and bilayer organization are interdependent. These domains are interspersed within mixed lipid/polymer vesicles that have a size distribution different from those of aggregates of the individual molecular constituents. The finding that fluidity changes induced within the lipid domains are correlated with the chromatic transitions demonstrates that the colorimetric platform can be used to evaluate the effects of individual molecular components, such as negatively charged lipids and cholesterol, upon membrane fluidity and thermal stability.
引用
收藏
页码:65 / 71
页数:7
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