相关实验视频
Updated: Jul 22, 2026

16:24
Analyzing and Building Nucleic Acid Structures with 3DNA
Published on: April 26, 2013
通过轻微交叉连接的阴阳性水凝来识别DNA的二次结构
Vladimir G Sergeyev1, Olga A Novoskoltseva, Olga A Pyshkina
1Chemistry Department, Polymer Science Division, Moscow State University, Moscow, 119899 Russia. sergeyev@genebee.msu.su
Journal of the American Chemical Society
|September 19, 2002
概括
线性多 (N-diallyl-N-dimethylammonium chloride) (PDADMAC) 压缩了DNA,形成了复杂的结构. 交联的PDADMAC水凝区分原生和变质DNA,使选择性捕获和释放成为可能.
科学领域:
- 聚合物科学 聚合物科学
- 生物化学 生化学
- 材料科学 材料科学 材料科学
背景情况:
- 聚 (Poly) N-diallyl-N-dimethylammonium chloride) (PDADMAC) 是一种合成的多化物.
- DNA存在于原生 (双链) 和变质 (单链) 形式.
- 了解DNA聚合相互作用对于基因传递和材料科学中的应用至关重要.
研究的目的:
- 调查线性和交联PDADMAC与不同分子质量的DNA的相互作用.
- 探索PDADMAC水凝在原生和变质DNA之间区分的能力.
- 评估PDADMAC水凝中DNA释放的条件.
主要方法:
- 紫外线光谱法 紫外线光谱法
- 通过超离心法进行超离心.
- 原子力显微镜的原子力显微镜.
- 光显微镜 (FM) 是一种光显微镜.
主要成果:
- 线性PDADMAC诱导了原生和变质DNA的紧缩,形成了介聚电解质复合物 (IPEC).
- #PDADMAC水凝选择性地捕获了表面的本地DNA和内部的变质DNA.
- 通过使用低分子盐,从水凝中释放出DNA而没有降解.
结论:
- PDADMAC-DNA的相互作用取决于DNA结构和PDADMAC的交叉链接.
- #PDADMAC水凝显示出选择性DNA分离和恢复的潜力.
- 物理化学方法与对超高分子质量DNA动态的直接FM观测有很好的相关性.
相关概念视频
The DNA Helix
Overview
The DNA Helix
Overview
DNA as a Genetic Template
Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
Fixing Double-strand Breaks
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Single-Strand DNA Binding Proteins
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
The DNA Helix
Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...

