相关实验视频
Updated: Aug 17, 2026

16:24
Analyzing and Building Nucleic Acid Structures with 3DNA
Published on: April 26, 2013
通过二维b/HLH/Z域识别Max对其相关DNA的识别
A R Ferré-D'Amaré1, G C Prendergast, E B Ziff
1Laboratories of Molecular Biophysics, Rockefeller University, New York, New York 10021.
Nature
|May 6, 1993
概括
转录因子Max通过其基本的螺旋环-螺旋环/氨酸拉链域进行二元化和结合DNA. 研究人员使用X射线晶体学阐明了其新的四螺旋束结构.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 转录因子Max在基因调节中起着至关重要的作用.
- 了解DNA结合的结构基础对于破译基因表达机制至关重要.
研究的目的:
- 确定与DNA复合的Max转录因子的三维结构.
- 为了阐明调控马克斯DNA结合特异性的分子相互作用.
主要方法:
- 使用X射线晶体学以2.9A分辨率确定结构.
- 对蛋白质-DNA复合结构的分析.
主要成果:
- 该结构揭示了马克斯将DNA结合成一个对称的同位体.
- 一个新的平行,左手,四螺旋捆蛋白质折叠被确定.
- 阿尔法螺旋基本区域与DNA主要沟之间的直接接触介于结合.
- 氨酸重复形成一个平行线圈的线圈,类似于GCN4.
结论:
- 确定的结构为转录因子Max的DNA识别提供了原子水平的见解.
- 这一发现揭示了新的蛋白质折叠,并澄清了Max.的二分化和DNA结合机制.
相关概念视频
RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
Cooperative Binding of Transcription Regulators
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
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...
RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
Cooperative Binding of Transcription Regulators
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
DNA Bacteriophages
Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...

