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
中科院分区:
文献类型:
--
作者:
Wittebort,RJ;Blume,A;Huang,TH;DasGupta,SK;Griffin,RG
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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DOI:
10.1016/0005-2736(77)90001-3
发表时间:
1977
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
G. Brady;D. B. Fein
通讯作者:
D. B. Fein
DOI:
10.1016/0006-291x(79)91494-3
发表时间:
1979
影响因子:
3.1
作者:
W. Graddick;J. Stamatoff;P. Eisenberger;D. Berreman;N. Spielberg
通讯作者:
N. Spielberg
DOI:
10.1016/0005-2736(75)90054-1
发表时间:
1975
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
A. Lee
通讯作者:
A. Lee
影响因子:
3.5
作者:
A. Blume;T. Ackermann
通讯作者:
T. Ackermann
DOI:
10.1073/pnas.75.6.2759
发表时间:
1978
影响因子:
11.1
作者:
B. Smith;H. Mcconnell
通讯作者:
H. Mcconnell