Thermophilic F1-ATPase Is Activated without Dissociation of an Endogenous Inhibitor, ε Subunit*

Thermophilic F1-ATPase Is Activated without Dissociation of an Endogenous Inhibitor, ε Subunit*
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嗜热 F1-ATP 酶在不解离内源抑制剂 ε 亚基的情况下被激活*

DOI:
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发表时间:
1997
影响因子:
4.8
通讯作者:
Masasuke Yoshida
Masasuke Yoshida
中科院分区:
生物学2区
文献类型:
--
作者:
Y. Kato;T. Matsui;N. Tanaka;E. Muneyuki;T. Hisabori;Masasuke Yoshida

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制备了高温F1-ATPase亚基复合体(α_3-β_3_γ,α_3_β_3_γδ,α_3_β_3_γε和α_3_β_3_γδε),并比较了它们的催化性能,以了解δ和ε亚基在催化中的作用。δ亚基的存在对ATPase的活性有轻微的抑制作用。ε亚基的作用更为深远。(−ε)络合物α-3-β-3-γ和α-3-β-3-γδ不滞后地启动了三磷酸腺苷的水解。相反,(+ε)络合物α3β3γε和α3β3γδε开始水解三磷酸腺苷(<700μm),滞后相在催化周转过程中逐渐激活。随着三磷酸腺苷浓度的增加,(+ε)复合体的滞后期变短,在1 mM以上观察不到滞后期。对三磷酸腺苷类似物2‘,3’-O-(2,4,6-三硝基苯基)-三磷酸腺苷的结合和水解分析表明,(+ε)络合物与底物结合的速度很慢。与大肠杆菌F1-ε酶不同,(+ε)复合体在滞后阶段的激活不是由于ε亚基的解离,因为重新分离的活化复合体保留了ATPase亚基。这表明(+ε)络合物存在两种可供选择的形式,即被抑制的形式和被激活的形式,并且在催化循环过程中被抑制的形式被转化为被激活的形式。
Subunit complexes (α3β3γ, α3β3γδ, α3β3γε, and α3β3γδε) of thermophilic F1-ATPase were prepared, and their catalytic properties were compared to know the role of δ and ε subunits in catalysis. The presence of δ subunit in the complexes had slight inhibitory effect on the ATPase activity. The effect of ε subunit was more profound. The (−ε) complexes, α3β3γ and α3β3γδ, initiated ATP hydrolysis without a lag. In contrast, the (+ε) complexes, α3β3γε and α3β3γδε, started hydrolysis of ATP (<700 μm) with a lag phase that was gradually activated during catalytic turnover. As ATP concentration increased, the lag phase of the (+ε) complexes became shorter, and it was not observed above 1 mm ATP. Analysis of binding and hydrolysis of the ATP analog, 2′,3′-O-(2,4,6-trinitrophenyl)-ATP, suggested that the (+ε) complexes bound substrate only slowly. Differing fromEscherichia coli F1-ATPase, the activation of the (+ε) complexes from the lag phase was not due to dissociation of ε subunit since the re-isolated activated complex retained ε subunit. This indicates that there are two alternative forms of the (+ε) complex, inhibited form and activated form, and the inhibited one is converted to the activated one during catalytic turnover.
DOI: --
发表时间: 1984
期刊: The Journal of biological chemistry
影响因子: --
作者:
Richter,ML;Patrie,WJ;McCarty,RE
通讯作者: McCarty,RE
牛心线粒体三磷酸腺苷酶上存在两个水解位点。
DOI: --
发表时间: 1981
期刊: The Journal of biological chemistry
影响因子: --
作者:
Grubmeyer,C;Penefsky,HS
通讯作者: Penefsky,HS
DOI: 10.1016/s0005-2728(05)80126-4
发表时间: 1991
期刊: Biochimica et biophysica acta
影响因子: --
作者:
Mendel-Hartvig,J;Capaldi,RA
通讯作者: Capaldi,RA
大肠杆菌中 F1-ATP 酶的单位点催化和 δ 亚基。
DOI: --
发表时间: 1994
期刊: The Journal of biological chemistry
影响因子: --
作者:
Xiao,R;Penefsky,HS
通讯作者: Penefsky,HS
根据引入该亚基不同位置的半胱氨酸残基的反应性,得出大肠杆菌 ATP 合酶中 epsilon 亚基的排列。
DOI: 10.1016/0005-2728(95)00040-p
发表时间: 1995
期刊: Biochimica et biophysica acta
影响因子: --
作者:
Aggeler,R;Weinreich,F;Capaldi,RA
通讯作者: Capaldi,RA