相关实验视频
Updated: Jul 17, 2026

06:13
Electroeluting DNA Fragments
Published on: September 5, 2010
用EDTA衍生的脱氧胺作为一种工具,通过增强分子间磁性放松来快速确定蛋白质与DNA的结合极性
Junji Iwahara1, D Eric Anderson, Elizabeth C Murphy
1Laboratories of Chemical Physics and Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases/NIH, Bethesda, MD 20892-0510, USA.
Journal of the American Chemical Society
|May 29, 2003
概括
由EDTA衍生的脱氧胺 (dT-EDTA) 专门通过Fe2+裂解DNA. 这种试剂可以通过对磁性放松增强来精确测量蛋白质-DNA相互作用和距离,从而帮助结构改进.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 以EDTA衍生的脱氧胺 (dT-EDTA) 是特定序列DNA裂变的关键试剂.
- 它的实用性延伸到通过对磁性放松增强研究蛋白质-DNA相互作用.
研究的目的:
- 为了研究dT-EDTA介导的DNA裂变的金属离子特异性.
- 证明dT-EDTA用于测量DNA复合体中的分子间距离和蛋白质结合极性.
主要方法:
- HPLC/电子喷射质谱法用于分析DNA裂变产物.
- 使用对磁性放松增强剂 (1HN-T2) 与各种金属离子 (Fe2+,Ca2+,Mn2+,Fe3+) 复合到DNA-EDTA.
- 研究SRY/DNA-EDTA复合体与特定位置的dT-EDTA修改.
主要成果:
- 通过dT-EDTA的DNA裂变对Fe2+具有高度特异性;其他金属离子不会诱导裂变.
- 分子间1HN-T2增强有效地确定蛋白质结合极性,并提供远程距离信息 (9-35 Å).
- 对SRY-DNA复合体的结构分析显示,实验数据和原子坐标之间有很好的一致性,并且变化最小.
结论:
- dT-EDTA是用于特定序列DNA裂变和蛋白质-DNA相互作用的精确结构研究的多功能工具.
- 通过金属离子选择调整放松增强的能力可以探测广泛的分子间距离.
- 这种方法有助于精确的蛋白质-DNA复合物的结构精细化.
相关概念视频
DNA Isolation
DNA from cells is required for many biotechnology and research applications, such as molecular cloning. To remove and purify DNA from cells, researchers use various methods of DNA extraction. While the specifics of different protocols may vary, some general concepts underlie the process of DNA extraction.
DNA Isolation
DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further processing. For example, plasmid DNA extraction is a bit more complicated than genomic DNA extraction because of the need for an appropriate lysis method to separate plasmid DNA from gDNA during isolation. However, for specific applications, such as long-range DNA sequencing that require a good yield of high- quality DNA samples, we need to follow...
EDTA: Chemistry and Properties
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
EDTA: Auxiliary Complexing Reagents
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
Effects of EDTA on End-Point Detection Methods
Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a result, EDTA...
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a result, EDTA...
Masking and Demasking Agents
EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...

