Phase diagrams and lipid domains in multicomponent lipid bilayer mixtures.

Phase diagrams and lipid domains in multicomponent lipid bilayer mixtures.
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DOI:
10.1016/j.bbamem.2008.08.014
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发表时间:
2009-01
影响因子:
3.4
通讯作者:
Feigenson, Gerald W.
Feigenson, Gerald W.
中科院分区:
生物学3区
文献类型:
--
作者:
Feigenson, Gerald W.

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对更简单系统的研究有助于理解生物膜的相行为。具有少至3种组分的模型膜表现出可以很好地描述的复杂相行为,为生物膜提供了洞察力。一些不同的研究是一致的一些组成相图的一般结果,特别是那些模型的动物细胞质膜的外小叶。这些模型混合物包括胆固醇,以及一种高熔点脂质和一种低熔点脂质。一个有趣的发现是两类这样的3组分混合物,导致我们所谓的I型和II型组成相图。后者具有{Lα+Lβ+Lo}和{Lα+Lo}宏观共存畴的相区,在光学显微镜下分辨畴。I型混合物具有相同的相共存区域,但结构域似乎是纳米级的。I型混合物可能是生物膜的更好模型。
Understanding the phase behavior of biological membranes is helped by the study of more simple systems. Model membranes that have as few as 3 components exhibit complex phase behavior that can be well described, providing insight for biological membranes. A number of different studies are in agreement on general findings for some compositional phase diagrams, in particular, those that model the outer leaflet of animal cell plasma membranes. These model mixtures include cholesterol, together with one high-melting lipid and one low-melting lipid. An interesting finding is of two categories of such 3-component mixtures, leading to what we term Type I and Type II compositional phase diagrams. The latter have phase regions of macroscopic coexisting domains of {Lα+Lβ+Lo} and of {Lα+Lo}, with domains resolved under the light microscope. Type I mixtures have the same phase coexistence regions, but the domains seem to be nanoscopic. Type I mixtures are likely to be better models for biological membranes.
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