Nystatin-induced liposome fusion. A versatile approach to ion channel reconstitution into planar bilayers.

Nystatin-induced liposome fusion. A versatile approach to ion channel reconstitution into planar bilayers.
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制霉菌素诱导的脂质体融合。

DOI:
10.1016/s0006-3495(90)82429-2
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发表时间:
1990
影响因子:
3.4
通讯作者:
Miller,C
Miller,C
中科院分区:
生物学3区
文献类型:
--
作者:
Woodbury,DJ;Miller,C

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介绍了一种简便的方法,用于促进和检测脂质体与平面双层膜的融合。含有麦角固醇的脂质体掺杂有成孔抗生素制霉菌素,并且平面双层保持不含麦角固醇。在这些条件下,当施加跨双层盐梯度时,添加到双层的高盐侧的脂质体引起5-300 pS的突然电导跳变的出现。电导的增加是短暂的,在10秒的量级上衰减回到基线。这些“尖峰”中的每一个代表单个脂质体与双层的融合,导致许多制霉菌素通道的同时插入。由于制霉菌素孔的完整性所需的麦角固醇在脂质体融合后扩散到无固醇的平面双层中,因此发生电导弛豫回到基线。当电鳐Cl-通道重组到含有麦角固醇和制霉菌素的脂质体中时,在Cl-通道出现的同时观察到融合峰。该方法允许计算含有重构通道蛋白的蛋白脂质体制剂中功能性离子通道的密度。
A simple method is described for promoting and detecting fusion of liposomes with planar bilayer membranes. Liposomes containing ergosterol are doped with the pore-forming antibiotic nystatin, and the planar bilayer is kept ergosterol-free. Under these conditions, when a transbilayer salt gradient is applied, liposomes added to the high-salt side of the bilayer elicit the appearance of abrupt conductance jumps of 5–300 pS. The increase in conductance is transient, decaying back to baseline on the order of 10 s. Each of these "spikes" represents the fusion of a single liposome with the bilayer, resulting in the simultaneous insertion of many nystatin channels. Relaxation of the conductance back to baseline occurs because ergosterol, required for the integrity of the nystatin pore, diffuses away into the sterol-free planar bilayer after liposome fusion. When Torpedo Cl- channels are reconstituted into liposomes containing ergosterol and nystatin, fusion spikes are observed simultaneously with the appearance of Cl- channels. This method allows the calculation of the density of functional ion channels in a preparation of proteoliposomes containing reconstituted channel protein.
通过融合合并离子通道
DOI: 10.1007/978-1-4757-1361-9_7
发表时间: 1986
期刊: Biochimica et biophysica acta
影响因子: --
作者:
W. Hanke
通讯作者: W. Hanke
通道在囊泡与平面双层融合中的作用。
DOI: --
发表时间: 1988
影响因子: 3.4
作者:
D. Woodbury;James E. Hall
通讯作者: James E. Hall
脂质体与平面双层的融合
DOI: 10.1007/978-1-4757-1361-9_6
发表时间: 1986
影响因子: 7.4
作者:
F. S. Cohen
通讯作者: F. S. Cohen
用制霉菌素处理的黑色脂质膜的孔径分布。
DOI: 10.1016/0005-2736(88)90321-5
发表时间: 1988
期刊: Biochimica et biophysica acta
影响因子: --
作者:
M. Moreno;M. Bonilla;C. Gonzalez
通讯作者: C. Gonzalez
多烯抗生素Nystatin和两性霉素B中诱导的薄脂质膜诱导的离子通透性。
DOI: 10.1085/jgp.56.1.100
发表时间: 1970-07
影响因子: 3.8
作者:
Cass, A;Finkelstein, A;Krespi, V
通讯作者: Krespi, V