Distances between the b-subunits in the tether domain of F(0)F(1)-ATP synthase from E. coli.

Distances between the b-subunits in the tether domain of F(0)F(1)-ATP synthase from E. coli.
复制标题

大肠杆菌 F(0)F(1)-ATP 合酶系链结构域中 b 亚基之间的距离。

DOI:
10.1016/j.bbabio.2005.03.013
复制
发表时间:
2005
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
M. Huber
M. Huber
中科院分区:
--
文献类型:
--
作者:
S. Steigmiller;M. Börsch;P. Gräber;M. Huber

文献摘要

参考文献

被引文献

相似文献

E.用自旋标记EPR技术对大肠杆菌进行了定点突变研究。F0 F1-ATP脱氢酶将质子转运与从ADP和磷酸合成ATP偶联。亲水性F1-部分和疏水性膜整合的F0-部分通过中心柄和外围柄连接。外周柄由两个b亚基组成。在b亚基的系链结构域的B-40、B-51、B-53、B-62或B-64处引入半胱氨酸突变,并用氮氧自旋标记物标记。常规(9 GHz),高场(95 GHz)和脉冲EPR光谱显示:所有的残留物都在一个相对极性的环境中,与流动性一致的螺旋网站。在每个b-亚基的自旋标记之间的距离是2.9 nm,在每个突变体,揭示了两个螺旋的平行排列。它们可以对齐,但分开很大的距离(1.9 nm),或紧密接触,并沿螺旋轴移位沿着最大2.7 nm,这排除了先前为b亚基提出的对齐卷曲螺旋模型。与不存在核苷酸的情况相比,不可水解的核苷酸AMPPNP与自旋标记的酶的结合对距离没有显著影响。
The arrangement of the b-subunits in the holo-enzyme F0F1-ATP synthase from E. coli is investigated by site-directed mutagenesis spin-label EPR. F0F1-ATP synthases couple proton translocation with the synthesis of ATP from ADP and phosphate. The hydrophilic F1-part and the hydrophobic membrane-integrated F0-part are connected by a central and a peripheral stalk. The peripheral stalk consists of two b-subunits. Cysteine mutations are introduced in the tether domain of the b-subunit at b-40, b-51, b-53, b-62 or b-64 and labeled with a nitroxide spin label. Conventional (9 GHz), high-field (95 GHz) and pulsed EPR spectroscopy reveal: All residues are in a relatively polar environment, with mobilities consistent with helix sites. The distance between the spin labels at each b-subunit is 2.9 nm in each mutant, revealing a parallel arrangement of the two helices. They can be in-register but separated by a large distance (1.9 nm), or at close contact and displaced along the helix axes by maximally 2.7 nm, which excludes an in-register coiled-coil model suggested previously for the b-subunit. Binding of the non-hydrolysable nucleotide AMPPNP to the spin-labeled enzyme had no significant influence on the distances compared to that in the absence of nucleotides.
比较电子顺磁共振方法以确定人碳酸酐酶 II 上自旋标记之间的距离。
DOI: 10.1016/s0006-3495(01)76254-6
发表时间: 2001
影响因子: 3.4
作者:
Persson,M;Harbridge,JR;Hammarström,P;Mitri,R;Mårtensson,LG;Carlsson,U;Eaton,GR;Eaton,SS
通讯作者: Eaton,SS
DOI: 10.1016/s0005-2728(98)00048-6
发表时间: 1998-06
期刊: Biochimica et biophysica acta
影响因子: --
作者:
S. Wilkens;R. Capaldi
通讯作者: S. Wilkens;R. Capaldi
DOI: --
发表时间: 1993
期刊: The Journal of biological chemistry
影响因子: --
作者:
McCormick,KA;Deckers-Hebestreit,G;Altendorf,K;Cain,BD
通讯作者: Cain,BD
DOI: 10.1073/pnas.92.24.10964
发表时间: 1995-11-21
影响因子: 11.1
作者:
DUNCAN, TM;BULYGIN, VV;CROSS, RL
通讯作者: CROSS, RL
DOI: 10.1021/bi960482k
发表时间: 1996-06-18
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
Mchaourab, HS;Lietzow, MA;Hubbell, WL
通讯作者: Hubbell, WL