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
中科院分区:
文献类型:
--
作者:
Y. Kato;T. Matsui;N. Tanaka;E. Muneyuki;T. Hisabori;Masasuke Yoshida
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.
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DOI:
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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
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
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
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