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氨酸在每8纳米的步骤中解1个ATP
1Department of Physics, Princeton University, New Jersey 08544, USA. schnitzr@princeton.edu
Nature
|July 24, 1997
概括
素电机蛋白消耗一个ATP分子每8纳米沿着微管的步骤. 这项研究确定了kinesin的ATP-to-step比率,澄清了其在运动期间的能量使用.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞生物物理学 细胞生物物理学
背景情况:
- 素是一种依赖ATP的运动蛋白,沿着微管子移动.
- 了解机械化学合 (每个步骤的ATP消耗) 对于激素的功能至关重要.
- 之前对类似的运动蛋白,如actomyosin的研究已经面临实验挑战和争议.
研究的目的:
- 为了确定每一步为kinesin的ATP分子的精确数量.
- 在没有直接测量ATPase活性的情况下,阐明基因素的机械化学合比.
- 为了限制kinesin分子运动机制的理论模型.
主要方法:
- 利用单个素分子附在珠子上,在微管上移动.
- 采用高分辨率的干扰仪来精确跟踪珠子的移动.
- 分析了限制ATP度和电机速度波动与ATP度之间的步骤间隔.
主要成果:
- 素分子在每一个8纳米的步骤中将单个ATP分子水解.
- 在接近零负载条件下观察到这种1:1的ATP-步骤比率.
- 这些发现排除了复杂的一对多或多对一ATP水解方案.
结论:
- 氨酸以严格的每8纳米的ATP一步合比率运行.
- 这一发现简化了素能量转导机制的模型.
- 结果为了解分子运动功能和动力学提供了关键数据.
相关概念视频
Hydrolysis of ATP
The bonds of adenosine triphosphate (ATP) can be broken through the addition of water, releasing one or two phosphate groups in an exergonic process called hydrolysis. This reaction liberates the energy in the bonds for use in the cell—for instance, to synthesize proteins from amino acids.
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
Chemiosmosis
Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons reduce...
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons reduce...
Hydrolysis of ATP
The bonds of adenosine triphosphate (ATP) can be broken through the addition of water, releasing one or two phosphate groups in an exergonic process called hydrolysis. This reaction liberates the energy in the bonds for use in the cell—for instance, to synthesize proteins from amino acids.
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
ATP Energy Storage and Release
ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
One example of energy coupling using ATP involves a...
One example of energy coupling using ATP involves a...
ATP Energy Storage and Release
ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
One example of energy coupling using ATP involves a...
One example of energy coupling using ATP involves a...
Chemiosmosis and ATP Synthesis
The electron transport chain is a critical component of cellular respiration, occurring in the inner mitochondrial membrane. It facilitates the transfer of high-energy electrons from reduced cofactors NADH and FADH₂ to molecular oxygen, the final electron acceptor. This transfer of electrons through a series of protein complexes is tightly coupled to the translocation of protons across the membrane, generating a proton gradient essential for ATP synthesis.Electron Flow and Proton...

