Hydrocarbon chain packing and the effect of ethanol on the thermotropic phase behavior of mixed-chain phosphatidylglycerols.

Hydrocarbon chain packing and the effect of ethanol on the thermotropic phase behavior of mixed-chain phosphatidylglycerols.
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烃链堆积和乙醇对混合链磷脂酰甘油热致相行为的影响。

DOI:
10.1016/s0005-2736(98)00242-9
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发表时间:
1999
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Huang,CH
Huang,CH
中科院分区:
--
文献类型:
--
作者:
Durvasula,RV;Huang,CH

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该实验室的先前研究已经描绘了混合链磷脂酰胆碱的酰基链不对称性与乙醇浓度([EtOH])对其熔融行为的影响之间的关系(Li等人,生物物理学杂志,70(1996)2784-2794)。本研究将这些发现扩展到另一个磷脂家族,通过使用高分辨率差示扫描量热法(DSC)来表征乙醇浓度对混合链磷脂酰甘油(PG)的五种分子种类的主要相变温度(Tm)的影响。对于C(14):C(18)PG、C(15):C(17)PG、C(16):C(16)PG和C(17):C(15)PG,观察到Tm与[EtOH]图中的双相曲线,并且每种PG的图中最小值分别出现在33、15、19和36 mg/ml。这种两相行为是磷脂的典型特征,其酰基链不对称性相当小。对于C(18):C(14)PG,仅观察到Tm随乙醇浓度的线性降低;这种效应是高度不对称磷脂的特征。我们在乙醇存在下用混合链PG获得的DSC结果表明,所研究的五种脂质的酰基链不对称性可以排列如下:C(15):C(17)PG<C(16):C(16)PG<C(14):C(18)PG<C(17):C(15)PG<C(18):C(14)PG,证实了本实验室的独立结果,即PG在水合凝胶相中的总体酰基链结构与在单晶中检测到的相反。在完全水合的双层中,PG的酰基链构象最有可能与磷脂酰胆碱的酰基链构象相似。
Previous studies in this laboratory have delineated the relationship between the acyl chain asymmetry of mixed-chain phosphatidylcholines and the effect of ethanol concentration ([EtOH]) on their melting behavior (Li et al., Biophys J., 70 (1996) 2784–2794). This present investigation extends these findings to another phospholipid family by using high-resolution differential scanning calorimetry (DSC) to characterize the effect of ethanol concentration on the main phase transition temperature (Tm) of five molecular species of mixed-chain phosphatidylglycerol (PG). For C(14):C(18)PG, C(15):C(17)PG, C(16):C(16)PG, and C(17):C(15)PG, a biphasic profile in the Tmversus [EtOH] plot was observed, and the minimum in the plot for each PG occurred at 33, 15, 19, and 36 mg/ml, respectively. This biphasic behavior is typical of phospholipids whose acyl chain asymmetry is fairly small. For C(18):C(14)PG, only a linear decrease in the Tmwas observed as a function of ethanol concentration; this effect is characteristic of highly asymmetric phospholipids. Our DSC results obtained with mixed-chain PG in the presence of ethanol demonstrate that the acyl chain asymmetry of the five lipids studied can be ranked as follows: C(15):C(17)PG<C(16):C(16)PG<C(14):C(18)PG<C(17):C(15)PG<C(18):C(14)PG, confirming independent results from this laboratory that the overall acyl chain structure of PG in the hydrated gel phase is opposite to that detected in the single crystals. In fully hydrated bilayers, the acyl chain conformation of PG is most likely to be similar to that of phosphatidylcholine.
存在和不存在钙离子时合成磷脂酰甘油和磷脂酰胆碱二元混合物的相行为。
DOI: --
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