Role of membrane curvature in mechanoelectrical transduction: ion carriers nonactin and valinomycin sense changes in integral bending energy.

Role of membrane curvature in mechanoelectrical transduction: ion carriers nonactin and valinomycin sense changes in integral bending energy.
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膜曲率在机械电传导中的作用:离子载体非肌动蛋白和缬氨霉素感知积分弯曲能的变化。

DOI:
10.1016/j.bbamem.2006.09.016
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发表时间:
2006
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Ismailov,II
Ismailov,II
中科院分区:
--
文献类型:
--
作者:
Shlyonsky,VGh;Markin,VS;Andreeva,I;Pedersen,SE;Simon,SA;Benos,DJ;Ismailov,II

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我们描述了在宏观脂质双分子层膜改性的阳离子选择性离子载体,缬氨霉素和nonactin的机电转导的现象。我们发现,膨胀这些膜,同时保持膜张力恒定,产生了显着的超线性增加,在特定的载体介导的电导。对由静水压梯度或两亲化合物氯丙嗪引起的机械电转导中所涉及的机制的分析揭示了界面处电荷载流子运动性和载流子反应速率的类似变化。此外,在膜电导的相对变化是独立的膜直径,但成正比的平方膜曲率,从而与观察到的现象的双层弯曲能。外推到生物膜,这些发现表明,细胞中的离子转运可以简单地通过改变膜的形状而不改变膜张力来影响。
We describe the phenomenon of mechanoelectrical transduction in macroscopic lipid bilayer membranes modified by two cation-selective ionophores, valinomycin and nonactin. We found that bulging these membranes, while maintaining the membrane tension constant, produced a marked supralinear increase in specific carrier-mediated conductance. Analyses of the mechanisms involved in mechanoelectrical transduction induced by the imposition of a hydrostatic pressure gradient or by an amphipathic compound chlorpromazine reveal similar changes in the charge carrier motility and carrier reaction rates at the interface(s). Furthermore, the relative change in membrane conductance was independent of membrane diameter, but was directly proportional to the square of membrane curvature, thus relating the observed phenomena to the bilayer bending energy. Extrapolated to biological membranes, these findings indicate that ion transport in cells can be influenced simply by changing shape of the membrane, without a change in membrane tension.
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