通过kinesin进行过程性ATP水解的途径
S P Gilbert1, M R Webb, M Brune
1Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park 16802.
Nature
|February 23, 1995
概括
这种类型的激素是kinesin.
科学领域:
- 分子运动功能的分子运动功能.
- 生物化学 生物化学
- 细胞生物学 细胞生物学
背景情况:
- 素是一种运动蛋白,沿着微管子移动.
- 了解素ATPase循环对于解释其运动性至关重要.
- 基因素的功能与骨肌肉蛋白相比较.
研究的目的:
- 直接测量基因素与微管体相互作用的动力学.
- 为了阐明基因素ATPase循环的机制.
- 为了解释基因素和骨肌肉蛋白之间的运动性差异.
主要方法:
- 直接测量素与微管体相互作用的动力学测量.
- 分析素的ATP水解周期,包括酸盐和ADP的释放.
- 对素重新结合微管的研究.
主要成果:
- 在ATP水解后,从微管中解离素是限制速度的步骤.
- 随着盐度的增加,素的过程性 (ATP水解每位) 降低.
- 素-ADP对微管的重新结合是快速的,使解离状态中的时间最小化.
结论:
- 这项研究定义了基因素ATPase循环机制.
- 解离动力学解释了素的职能周期和运动性.
- 与骨肌肉素相比,解离和重新结合动力学的差异解释了运动率的变化.
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...
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 Synthase: Mechanism
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ATP Synthase: Structure
ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
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The Movement of Organelles and Vesicles
In eukaryotic cells, cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...


