Carbon-13 nuclear magnetic resonance investigations of phase transitions and phase equilibria in pure and mixed phospholipid bilayers.

Carbon-13 nuclear magnetic resonance investigations of phase transitions and phase equilibria in pure and mixed phospholipid bilayers.
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纯磷脂双层和混合磷脂双层中相变和相平衡的碳 13 核磁共振研究。

DOI:
10.1021/bi00257a036
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发表时间:
1982
期刊:
影响因子:
2.9
通讯作者:
Griffin,RG
Griffin,RG
中科院分区:
生物学3区
文献类型:
--
作者:
Wittebort,RJ;Blume,A;Huang,TH;DasGupta,SK;Griffin,RG

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R. J. Wittebort,1 A.布卢姆,8 T.- H. Huang,S. K. Das Gupta和RG Griffin* 摘要:研究了二棕榈酰磷脂酰乙醇胺(DPPE)和三种卵磷脂--二肉豆蔻酰-、二棕榈酰-和二硬脂酰磷脂酰胆碱--的13 C NMR光谱的温度依赖性,这些卵磷脂已在sn-2羰基处进行了13 C标记。在Lg或Lp相中,观察到约100-ppm宽度的轴对称粉末图案,并且这在主(L^)-*· La相变处转变为各向同性线。在DPPE的情况下,这种转变发生急剧,从2* H光谱的2 H链标记的DPPE的数据,显示是由于在thesn-2羰基构象的变化。与此相反,13 C = 0 Sn-2光谱的卵磷脂表现出逐渐转变,开始在温度低于吸热预转变温度。因此,在中间Pp相,Lp和La样13 C光谱的温度依赖性叠加观察,这表明Pp相是结构上的异质性,并表现出两者的性能。A.纯脂质双层的普遍性质是在温度(Tc)下存在从有序(凝胶)相到无序(液晶)相的热致相变。正如预期的那样,这种转变的详细性质取决于脂质分子的结构-例如,酰基链长度和极性头部基团的性质-并且它也会受到向双层中掺入额外组分以形成多组分脂质系统的强烈影响(Lee,1977)。此外,已经有几项研究表明生物膜的功能至少部分地由双层中脂质的相行为控制(奥弗拉特等人,一九七五年;
R. J. Wittebort, 1 A. Blume, 8 T.-H. Huang, S. K. Das Gupta, and RG Griffin* abstract: The temperature dependence of the 13C NMR spectra of dipalmitoylphosphatidylethanolamine (DPPE) and three lecithins—dimyristoyl-, dipalmitoyl-, and distearoylphosphatidylcholine—which have been 13C-labeled at the sn-2 carbonyl has been studied. In the Lg or Lp phase, an axially symmetric powder pattern of about 100-ppm breadth is observed, and this transforms to an isotropic line at the main (L^)—*· La phase transition. In the case of DPPE, this transformation occurs precipitously and, with data from 2**** H spectra of 2H chain labeled DPPE, is shown to be due to a change in conformation at thesn-2 carbonyl. In contrast, the 13C= 0 sn-2 spectra of lecithins exhibit a gradual transformation, beginning at temperatures below the endothermic pretransition temperature. Thus, in the intermediate Pp phase, a temperature-dependent superposition of the Lp-and La-like 13C spectra is observed, suggesting that the Pp phase is structurally heterogeneous and exhibits properties of both the. A. ubiquitous property of pure lipid bilayers is the existence of a thermotropic phase transition at a temperature (Tc) from an ordered (gel) phase to a disordered (liquid-crystalline) phase. As might be expected, the detailed nature of this transition depends on the structure of the lipid molecule—eg, the acyl chain length and the nature of the polar head group—and it can also be strongly affected by the incorporation of additional components into the bilayer to form a multiple component lipid system (Lee, 1977). Moreover, there have been several studies which suggest that the function of biological membranes is atleast partially controlled by the phase behavior of the lipids in the bilayer (Overath et al., 1975;
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影响因子: 11.1
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