Miscibility phase diagrams of giant vesicles containing sphingomyelin

Miscibility phase diagrams of giant vesicles containing sphingomyelin
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DOI:
10.1103/physrevlett.94.148101
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发表时间:
2005-04-15
影响因子:
8.6
通讯作者:
Keller, SL
Keller, SL
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Veatch, SL;Keller, SL

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饱和鞘磷脂(SM)脂质参与细胞质膜中的脂筏。在这里,我们使用荧光显微镜观察共存的液体域中含有SM,不饱和磷脂酰胆碱脂质(DOPC或POPC),和胆固醇的囊泡。我们注意到在没有SM的模型膜混合物(DOPC/DPPC/Chol)中类似的相行为,但在POPC/PSM/Chol的膜中没有发现微米尺度的液区。我们描绘了发病的固相低于结晶转变温度,并详细的一个固体和两个液相的三相共存的间接证据。
Saturated sphingomyelin (SM) lipids are implicated in lipid rafts in cell plasma membranes. Here we use fluorescence microscopy to observe coexisting liquid domains in vesicles containing SM, an unsaturated phosphatidylcholine lipid (either DOPC or POPC), and cholesterol. We note similar phase behavior in a model membrane mixture without SM (DOPC/DPPC/Chol), but find no micron-scale liquid domains in membranes of POPC/PSM/Chol. We delineate the onset of solid phases below the miscibility transition temperature, and detail indirect evidence for a three-phase coexistence of one solid and two liquid phases.