A subtransition in a phospholipid with a net charge, dipalmitoylphosphatidylglycerol.

A subtransition in a phospholipid with a net charge, dipalmitoylphosphatidylglycerol.
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带有净电荷的磷脂(二棕榈酰磷脂酰甘油)中的亚转变。

DOI:
10.1021/bi00350a002
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发表时间:
1986
期刊:
影响因子:
2.9
通讯作者:
McIntosh,TJ
McIntosh,TJ
中科院分区:
生物学3区
文献类型:
--
作者:
Wilkinson,DA;McIntosh,TJ

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材料和方法二棕榈酰磷脂酰甘油(DPPG铵盐)得自Sigma Chemical Co.,St. Louis,MO,并且由于主要转变的窄性(0.3C半宽)与目前可获得的其它合成磷脂相当,因此不经进一步纯化而使用。在我们的实验中,薄层色谱法是一种灵敏度低于微量热法的纯度测定方法,因此没有使用。在低温下长期孵育的过程中,这种转变的半宽有所加宽,达到约0.6 C(见图1)。通过将样品加热至70 ℃几分钟并通过涡旋(5次,每次15秒)分散脂质,使样品在中性pH的缓冲液中水合。使用三种缓冲液:5和50 mM磷酸钠(pH 7.0)和50 mM Tris-HCl(pH 7.4)。对于量热实验,脂质浓度为2-2.5 mg/mL,对于渗透率测定,脂质浓度为15 mg/mL。较高的脂质浓度用于X射线实验,对于大多数实验,缓冲液含量为20- 60重量%。对于这些高脂
Materials and MethodsDipalmitoylphosphatidylglycerol (DPPG ammonium salt) was obtained from Sigma Chemical Co., St. Louis, MO and used without further purification since the narrowness of the main transition (0.3 C half-width) is comparable to that of other synthetic phospholipids currently available. In our ex-perience, thin-layer chromatography is a less sensitive assay of purity than microcalorimetry and was therefore not used.During the course of long-term incubation at low temperature, there was some broadening of this transition to about 0.6 C half-width (see Figure 1). Samples were hydrated in buffer at neutral pH by heating them to 70 C for several minutes and dispersing the lipid by vortexing (5 times, 15 s each time). Three buffers were used: 5 and 50 mM sodium phosphate, pH 7.0, and 50 mM Tris-HCl, pH 7.4. Lipid concentrations were 2-2.5 mg/mL for the calorimetry experiments and 15 mg/mL for the dilatometry. Higher lipid concentrations were used for the X-ray experiments, with the buffer content being 20-60% by weight for most experiments. For these higher lipid
DOI: --
发表时间: 1983
影响因子: 4.8
作者:
J. Seddon;K. Harlos;D. Marsh
通讯作者: D. Marsh
DOI: 10.1021/bi00523a011
发表时间: 1981-01-01
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
FULDNER, HH
通讯作者: FULDNER, HH
磷脂酰胆碱双层:纯脂质和混合脂质中的亚转变。
DOI: 10.1016/0009-3084(84)90053-7
发表时间: 1984
影响因子: 3.4
作者:
L. Finegold;M. Singer
通讯作者: M. Singer
通过 pH 滴定控制磷脂酰甘油双层的结构和流动性。
DOI: --
发表时间: 1978
期刊: Biochimica et Biophysica Acta
影响因子: --
作者:
Anthony Watts;Karl Harlos;Wilfried Maschke;D. Marsh
通讯作者: D. Marsh
磷脂酰乙醇胺及其N-甲基衍生物的结构和热致性质。
DOI: 10.1021/bi00306a030
发表时间: 1984
期刊: Biochemistry
影响因子: 2.9
作者:
Mulukutla,S;Shipley,GG
通讯作者: Shipley,GG