Docosahexaenoyl chains isomerize on the sub-nanosecond time scale

被引：43
|
作者：
Soubias, Olivier [1 ]
Gawrisch, Klaus [1 ]
机构：
[1] NIAAA, Lab Membrane Biochem & Biophys, NIH, Bethesda, MD 20892 USA
来源：
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2007年 / 129卷 / 21期
关键词：
D O I：
10.1021/ja068856c
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The dynamics of docosahexaenoyl acyl chains (DHA) in 18:0-22:6n3-PC bilayers were studied by C-13 MAS NMR relaxation measurements. A Lipari-Szabo-type analysis yielded site-specific correlation times of DHA chain isomerization and C-H bond order parameters. It is concluded that DHA chains perform rapid isomerization with correlation times from 80 ps near the carbonyl group to 8 ps near the terminal methyl group. Spin-lattice relaxation rates remained unaltered after rhodopsin incorporation into the bilayers, indicating that the majority of lipids maintain their rapid chain isomerization in the presence of the protein. However, spin-spin relaxation rates revealed that rhodopsin increased motional correlation times of slow collective DHA motions.
引用
收藏
页码：6678 / +
页数：3
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