菌素与沃森-霍格斯 (W-H) DNA 三倍沟结合:一个模型模型
Dev P Arya1, Ljiljana Micovic, I Charles
1Laboratory of Medicinal Chemistry, Department of Chemistry, Clemson University, South Carolina 29634, USA. dparya@clemson.edu
Journal of the American Chemical Society
|March 27, 2003
概括
尼奥米辛有效地稳定了DNA三重螺旋,超过了其他沟结合剂. 这种氨基糖化物选择性地结合了三倍槽,为DNA结构操纵提供了一种新的方法.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- DNA三重螺旋是具有治疗潜力的关键核酸结构.
- 已知氨基糖化物与核酸相互作用,但它们在三环螺旋稳定中的作用不太清楚.
- 现有的DNA小沟结合剂往往会破坏三重螺旋的稳定.
研究的目的:
- 调查neomycin在稳定DNA三环螺旋中的有效性和机制.
- 为了比较neomycin的稳定作用与其他已知的DNA结合剂.
- 阐明neomycin对DNA三重复合物的结合特性和选择性.
主要方法:
- 循环二重化 (CD) 光谱法用于研究结合.
- 粘度测量研究以评估结合方式.
- 用于热力学分析的异热定位热量计 (ITC).
- 分子建模用于预测结合相互作用.
主要成果:
- 尼奥米辛显著稳定了TAT和混合基DNA三环,超过了其他沟结合剂.
- 稳定性取决于盐度和pH值.
- 尼奥米辛表现出非间接沟结合,更喜欢更宽的W-H沟.
- 结合性研究表明涉及neomycin的氨基群的特定相互作用.
结论:
- 尼奥米是一种高效和选择性的DNA三环螺旋稳定剂.
- 它独特的电荷和形状的互补性使得可以选择性地识别三重槽的双重槽.
- 菌素代表了一种用于准和稳定DNA三重结构的新型分子工具.
相关概念视频
01:16The DNA Helix
Overview
01:16The DNA Helix
Overview
02:05DNA 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...
02:08Gene Conversion
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
01:05Maxam-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...
01:07The 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...