通过含有SMRT,mSin3A和基因素脱乙酶的复合物介导的核受体抑制
L Nagy1, H Y Kao, D Chakravarti
1The Salk Institute for Biological Studies, La Jolla, California 92037, USA.
Cell
|May 2, 1997
概括
转录核心抑制剂SMRT和N-CoR与mSin3A和基因素脱乙酶1 (HDAC1) 相互作用,形成一个抑制剂复合体. 这种复合体对于调节激素反应基因和细胞分化至关重要.
科学领域:
- 分子生物学分子生物学
- 基因规则 基因规则
- 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:
- SMRT (视网膜和甲状腺激素受体的沉默媒介) 和N-CoR (核受体核心压缩器) 是关键的转录核心压缩剂.
- 这些核心压缩剂介于对视网膜和甲状腺激素受体的沉默,这些受体对细胞过程至关重要.
- mSin3A是Mad-Max异构体的已知核心压缩剂,与酵母Sin3p同源,参与全球转录抑制.
研究的目的:
- 研究SMRT,N-CoR和mSin3A之间的相互作用.
- 为了识别在这个核心压缩机复合体内相互作用的其他蛋白质.
- 了解这种复杂的形成对基因表达和细胞分化的功能后果.
主要方法:
- 同免疫沉测试以证明直接的蛋白质与蛋白质相互作用.
- 西方涂抹检测蛋白质的存在和相互作用.
- 骨髓性白血病 (HL-60) 细胞的治疗用基因素脱乙酶 (HDAC) 抑制剂和网红酸.
主要成果:
- SMRT和N-CoR直接与mSin3A进行相互作用.
- 发现基因组脱乙酶1 (HDAC1) 与Sin3A和SMRT相互作用,形成一个多子单元抑制剂复合体.
- HDAC 抑制剂与视网氨酸协同作用,刺激激素反应基因并诱导HL-60细胞的分化.
结论:
- 已经确定了一种新型的多子单元抑制器综合体,涉及SMRT,N-CoR,mSin3A和HDAC1.
- 这项研究揭示了基本螺旋环-螺旋拉链 (bHLH-Zip) 蛋白质和核受体的抑制途径的融合.
- 这些发现表明,这种类型的转录调节在不同的蛋白质家族和潜在的物种中得到保护.
更多相关视频
10:28Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
Published on: September 20, 2018
7.0K
10:09Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark
Published on: January 26, 2018
8.0K
相关概念视频
Co-activators and Co-repressors
8.8K
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...
8.8K
Co-activators and Co-repressors
3.2K
No description available
3.2K
Regulation of Nuclear Protein Sorting
3.4K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
3.4K
Chromatin Structure Regulates pre-mRNA Processing
8.4K
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
8.4K
Histone Modification
17.1K
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...
17.1K
Histone Modification
4.9K
No description available
4.9K
