对HDAC4-MEF2A-DNA复合体的结构见解及其对远程转录调节的影响
Shuyan Dai1,2, Liang Guo3, Raja Dey4
1Department of Oncology, NHC Key Laboratory of Cancer Proteomics & State Local Joint Engineering Laboratory for Anticancer Drugs, National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China.
Nucleic acids research
|January 28, 2024
概括
类IIa 像HDAC4这样的基因脱甲基酶 (HDAC) 通过与MEF2转录因子相互作用来调节基因表达. 这项研究揭示了HDAC4-MEF2A-DNA复合体的结构基础,表明HDAC4二分化是基因抑制的关键.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 第IIa类 基因组脱乙酶 (HDACs) 是发育和分化的关键调节剂.
- HDACs,特别是HDAC4,通过与转录因子 (如肌细胞增强因子2 (MEF2)) 等转录因子相互作用而起作用.
- 在HDAC介导的转录抑制背后的精确分子机制仍然不完全理解.
研究的目的:
- 阐明HDAC4,MEF2A和DNA之间的相互作用的结构基础.
- 了解HDAC4二分化在转录抑制中的作用.
- 提供对HDAC4介导的长距离基因调节机制的见解.
主要方法:
- 进行X射线晶体学以确定HDAC4-MEF2A-DNA复合物的结构.
- 生物化学和突变发生分析验证结构性发现.
- 基于细胞的 luciferase 记者基因测定以评估转录活性.
主要成果:
- 晶体结构显示出一个子形复合体,HDAC4,MEF2A和DNA的 2:4:2静态度.
- HDAC4分子通过其富含谷氨酸的域 (GRD) 进行二元化,形成复合物的干.
- HDAC4二元体将MEF2A二元体与DNA结合,而HDAC4二元化对于抑制MEF2转录活性至关重要.
结论:
- 这项研究为HDAC4-MEF2A-DNA复合体提供了第一个结构视图.
- HDAC4二分化是其在转录抑制中的功能的一个关键机制.
- 这些发现揭示了HDAC4介导的基因调节的分子基础.
相关概念视频
Master Transcription Regulators
6.9K
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
6.9K
Histone Modification
13.3K
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
13.3K
Heterochromatin
12.8K
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
12.8K
Co-activators and Co-repressors
7.4K
Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
7.4K
Spreading of Chromatin Modifications
8.3K
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
Writers
The writer...
8.3K
Cooperative Binding of Transcription Regulators
6.4K
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...
6.4K


