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.
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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
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发表时间:
2005
期刊:
影响因子:
--
通讯作者:
M. Huber
中科院分区:
文献类型:
--
作者:
S. Steigmiller;M. Börsch;P. Gräber;M. Huber
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.
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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
影响因子:
2.9
作者:
Mchaourab, HS;Lietzow, MA;Hubbell, WL
通讯作者:
Hubbell, WL