相关实验视频
Updated: Jul 20, 2026

06:13
Electroeluting DNA Fragments
Published on: September 5, 2010
用低能电子进行DNA糖酸盐裂变的化学基础
Yi Zheng1, Pierre Cloutier, Darel J Hunting
1Group in the Radiation Sciences, Faculty of Medicine, Université de Sherbrooke, Sherbrooke, Québec, Canada J1H 5N4.
Journal of the American Chemical Society
|November 25, 2005
概括
低能电子 (LEE) 通过在寡核酸四聚体中裂解二键,导致DNA损伤. 这种损伤机制涉及电子附着和随后的键解离,形成未经修改的DNA片段.
科学领域:
- 生物物理学的生物物理.
- 化学物理 化学物理
- 分子生物学分子生物学
背景情况:
- 低能电子 (LEE) 与生物分子的相互作用对于理解辐射损伤至关重要.
- 寡核酸是DNA的基本组成部分,它们的结构完整性对遗传信息至关重要.
- 之前的研究已经探讨了DNA损伤,但缺乏对LEE诱导的键断裂的详细机制见解.
研究的目的:
- 为了研究由低能电子 (LEE) 诱导的DNA损伤的机制,在寡核酸四聚体中.
- 为了识别和量化LEE辐射产生的DNA碎片.
- 为了阐明基和N-糖化合物键裂解的特定途径.
主要方法:
- 在超高真空下,用10 eV单能电子对寡核酸四基体 (CGTA和GCAT) 薄固体薄膜进行辐射.
- 使用高性能液体染色学 (HPLC) 分析辐射产品.
- 测量未经修改的核基,核酸和核酸碎片.
主要成果:
- 来自LEE辐射的16个不同的未经修改的碎片的量化. 寡核酸四聚体.
- 证据表明,最初的电子附着于核基,然后转移到糖酸盐骨干.
- 分离性电子附着导致二键裂变,形成与完整的终端酸盐群保持不变的碎片.
结论:
- 通过解离性电子附着,LEE诱导DNA损伤,主要是分裂基键.
- 二键断裂存在一个不同的途径,在这种途径上,负电荷的局部化会产生未经修改的碎片.
- 需要进一步的研究,以确定糖部分的激进局部化导致的修饰.
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...
Energy-releasing Steps of Glycolysis
Glycolysis is divided into two phases based on whether energy is utilized or released. While the first phase consumes ATP, the second phase produces energy in the form of ATP and NADH. The energy is released over a sequence of reactions that turns G3P into pyruvate. The energy-releasing phase—steps 6-10 of glycolysis—occurs twice, once for each of the two 3-carbon sugars produced during steps 1-5 of the first phase.
The first energy-releasing step—the 6th step of glycolysis —consists of two...
The first energy-releasing step—the 6th step of glycolysis —consists of two...
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...
Maxam-Gilbert Sequencing
In the same year as the discovery of the Sanger sequencing method, another group of scientists, Allan Maxam and Walter Gilbert, demonstrated their chemical-cleavage method for DNA sequencing. The Maxam-Gilbert method relies on using different chemicals that can cleave the DNA sequence at specific sites, the separation of resulting DNA fragments of variable size using electrophoresis, and deciphering the DNA sequence from the resulting gel bands.
Challenges of the Maxam-Gilbert Method
The...
Challenges of the Maxam-Gilbert Method
The...
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...

