Changes in plasma membrane fluidity of corn (Zea mays L.) roots after Brij 58 treatment

被引:0
|
作者
M. Behzadipour
M. Kluge
S. Lüthje
机构
[1] Technische Universität Darmstadt,Institut für Botanik
[2] Universität Hamburg,Institut für Allgemeine Botanik
来源
Protoplasma | 2001年 / 217卷
关键词
Brij 58; Corn root; Plasma membrane fluidity;
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中图分类号
学科分类号
摘要
The detergent Brij 58 has been introduced to reverse plasma membrane (PM) vesicles from the right-side-out to the inside-out form. The aim of the present work was to investigate the effect of Brij 58 on the formation of an ATP-dependent proton gradient and on the fluidity of the lipid phase of PM vesicles. PMs of corn (Zea mays L.) roots were isolated by phase-partitioning. The fluidity of PMs was estimated by measurement of fluorescence polarization with 1-(4-trimethylammoniumphenyl)-6-phenyl-1,3,5-hexatriene (TMA-DPH) and 1,6-diphenyl-1,3,5-hexatriene (DPH). The PMs of corn roots were relatively rigid. The hydrophobic part of the lipid bilayer was more fluid than the hydrophilic part. After intercalation of Brij 58 into the lipid bilayer the membrane fluidity changed in a concentration-dependent manner. Treatment with the detergent Brij 58 increased the degree of fluorescence polarization for TMA-DPH, while it decreased it for DPH. This effect was saturated at a detergent-to-protein ratio of 1 ∶ 4 for both fluorescence probes. Although the biophysical characteristics of the membrane were changed after Brij 58 treatment, the formation of ATP-dependent proton gradients could still be measured with those vesicles. The generation of an ATP-dependent proton gradient with Brij 58-treated PM vesicles suggests that the detergent treatment indeed turned the originally right-side-out vesicles to sealed inside-out vesicles. The limits of the effect caused by Brij 58 in the context of PM enzyme activities are discussed.
引用
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页码:65 / 69
页数:4
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