ANALYSIS OF DICTYOSTELIUM-DISCOIDEUM PLASMA-MEMBRANE FLUIDITY BY ELECTRON-SPIN RESONANCE

被引:11
作者
HERRING, FG [1 ]
WEEKS, G [1 ]
机构
[1] UNIV BRITISH COLUMBIA,DEPT MICROBIOL,VANCOUVER V6T 1W5,BC,CANADA
关键词
(Dictyostelium discoideum membrane); ESR; Fluidity analysis;
D O I
10.1016/0005-2736(79)90246-3
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Dictyostelium discoideum grown axenically in media containing polyunsaturated fatty acids exhibited normal growth rates but impaired differentiation (Weeks, G. (1976) Biochim. Biophys. Acta 450, 21-32). Since cell-cell contact is vital for differentiation but unnecessary for growth we have examined the isolated plasma membranes of these cells. The lipids of the plasma membranes of cells grown in the presence of polyunsaturated fatty acids contain considerable quantities of these acids, but the total phospholipid and sterol contents of the plasma membrane are close to normal. Electron spin resonance studies using 5-doxyl-stearic acid as the spin probe reveal two things. Firstly, there are no detectable characteristic transition temperatures in the plasma membranes of D. discoideum. Secondly, the plasma membranes of cell grown in the presence of polyunsaturated fatty acids have essentially the same fluidity as that of the control cells. The possible significance of this result to impaired cell-cell interaction is discussed. © 1979.
引用
收藏
页码:66 / 77
页数:12
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