F1-ATPase Changes Its Conformations upon Phosphate Release*

F1-ATPase Changes Its Conformations upon Phosphate Release*
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F1-ATP 酶在磷酸盐释放时改变其构象*

DOI:
10.1074/jbc.m110297200
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发表时间:
2002
期刊:
The Journal of Biological Chemistry
影响因子:
--
通讯作者:
Masasuke Yoshida
Masasuke Yoshida
中科院分区:
--
文献类型:
--
作者:
T. Masaike;E. Muneyuki;H. Noji;K. Kinosita;Masasuke Yoshida

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运动蛋白、肌球蛋白和驱动蛋白在开关 II 环中具有 γ-磷酸传感器,在支持运动的构象变化中发挥关键作用。在这里,我们报告旋转马达 F1-ATP 酶也会在磷酸盐释放时改变其构象。将色氨酸突变引入嗜热芽孢杆菌 PS3 的 F1-ATPase β 亚基中的 Arg-333,作为构象变化的探针。该残基与核苷酸结合构象中 β 亚基的开关 II 环(残基 308-315)相互作用。将 ATP 添加到突变体 F1 亚复合体 α3β(R333W)3γ 中会导致 Trp 荧光短暂增加并随后衰减。这种增加是由 ATP 结合构象变化引起的。腐烂速率与磷酸盐结合蛋白测定监测的磷酸盐释放速率非常一致。这是β亚基在磷酸盐释放时改变其构象的第一个证据,这可能与其他运动蛋白具有共同的运动机制。
Motor proteins, myosin, and kinesin have γ-phosphate sensors in the switch II loop that play key roles in conformational changes that support motility. Here we report that a rotary motor, F1-ATPase, also changes its conformations upon phosphate release. The tryptophan mutation was introduced into Arg-333 in the β subunit of F1-ATPase from thermophilic Bacillus PS3 as a probe of conformational changes. This residue interacts with the switch II loop (residues 308–315) of the β subunit in a nucleotide-bound conformation. The addition of ATP to the mutant F1subcomplex α3β(R333W)3γ caused transient increase and subsequent decay of the Trp fluorescence. The increase was caused by conformational changes on ATP binding. The rate of decay agreed well with that of phosphate release monitored by phosphate-binding protein assays. This is the first evidence that the β subunit changes its conformation upon phosphate release, which may share a common mechanism of exerting motility with other motor proteins.
双位点激活发生在天然和核苷酸耗尽的线粒体 F1-ATP 酶上。
DOI: 10.1042/bj3301037
发表时间: 1998
期刊: The Biochemical journal
影响因子: --
作者:
Milgrom,YM;Murataliev,MB;Boyer,PD
通讯作者: Boyer,PD
DOI: 10.1016/s0021-9258(20)80703-0
发表时间: 1993-09
期刊: The Journal of biological chemistry
影响因子: --
作者:
J. Weber;S. Wilke-Mounts;Rita S. F. Lee;E. Grell;A. E. Senior
通讯作者: J. Weber;S. Wilke-Mounts;Rita S. F. Lee;E. Grell;A. E. Senior
F1-ATPase 催化位点核苷酸周围的色氨酸取代。
DOI: 10.1021/bi981089c
发表时间: 1998
期刊: Biochemistry.
影响因子: --
作者:
Weber,J;Wilke-Mounts,S;Hammond,ST;Senior,AE
通讯作者: Senior,AE
DOI: --
发表时间: 1982
期刊: The Journal of biological chemistry
影响因子: --
作者:
Grubmeyer,C;Cross,RL;Penefsky,HS
通讯作者: Penefsky,HS
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