Site‐directed mutagenesis of colicin E1 provides specific attachment sites for spin labels whose spectra are sensitive to local conformation

Site‐directed mutagenesis of colicin E1 provides specific attachment sites for spin labels whose spectra are sensitive to local conformation
复制标题

大肠杆菌素 E1 的定点诱变为自旋标签提供了特定的附着位点,其光谱对局部构象敏感

DOI:
10.1002/prot.340060312
复制
发表时间:
1989
期刊:
Proteins: Structure
影响因子:
--
通讯作者:
Wayne L. Hubell
Wayne L. Hubell
中科院分区:
--
文献类型:
--
作者:
A. Todd;Jianping Cong;F. Levinthal;C. Levinthal;Wayne L. Hubell

文献摘要

参考文献

被引文献

相似文献

大肠杆菌素 E1 是一种大肠杆菌质粒编码的水溶性蛋白质,可自发插入脂质膜形成电压门控离子通道。我们采用了一种新颖的方法,即使用定点诱变为硝基氧自旋标签提供高度特异性的附着点。制备了一系列大肠菌素突变体,仅在单个半胱氨酸残基的位置上有所不同,并在该半胱氨酸处选择性标记。研究了该蛋白质水溶性形式的 C 端结构域内的亲水序列 (398-406),并表现出电子顺磁共振 (EPR) 光谱周期性,强烈表明存在两亲性 α 螺旋。用胰蛋白酶去除蛋白质的 N 末端后,该序列的光谱表明标记迁移率增加,结构更灵活。
Colicin E1 is an E. coli plasmid‐lencoded water‐soluble protein that spontaneously inserts into lipid membranes to form a voltage‐gated ion channel. We have employed a novel approach is which site‐directed mutagenesis is used to provide highly specific attachment points for nitroxide spin labels. A series of colicin mutants, differing only by the position of a single cysteine residue, were prepared and selectively labeled at that cysteine. A hydrophilic sequence (398–406) within the C‐terminal domain of the water‐soluble form of the protein was investigated and exhibited an electron paramagnetic resonancc (EPR) spectral periodicity strongly suggesting an amphiphilic α‐helix. After removal of the Nterminus of the protein with trypsin, the spectra for this sequence indicate increased label mobility and a more flexible structure.
DOI: 10.1126/science.3388019
发表时间: 1988-07
期刊: Science
影响因子: 56.9
作者:
J. Reidhaar-Olson;Robert T. Sauer
通讯作者: J. Reidhaar-Olson;Robert T. Sauer
大肠杆菌素 E1 通道形成肽的构象对酸性 pH 值和溶剂极性的依赖性。
DOI: --
发表时间: 1984
期刊: The Journal of biological chemistry
影响因子: --
作者:
Brunden,KR;Uratani,Y;Cramer,WA
通讯作者: Cramer,WA
假单胞菌外毒素 A。膜结合、插入和穿越。
DOI: --
发表时间: 1986
期刊: The Journal of biological chemistry
影响因子: --
作者:
Farahbakhsh,ZT;Baldwin,RL;Wisnieski,BJ
通讯作者: Wisnieski,BJ
DOI: --
发表时间: 1982
期刊: The Journal of biological chemistry
影响因子: --
作者:
Dankert,JR;Uratani,Y;Grabau,C;Cramer,WA;Hermodson,M
通讯作者: Hermodson,M