基因基因因子诱导的基因表达过程中,IKK-alpha对基因基因因 H3 的酸化至关重要
Yumi Yamamoto1, Udit N Verma, Shashi Prajapati
1Division of Hematology-Oncology, Department of Medicine, Harold Simmons Cancer Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390-8594, USA.
Nature
|June 6, 2003
概括
核IKK-alpha通过修改基因素功能来调节NF-kappaB依赖的基因表达. 这项研究揭示了IKK-alpha在细胞因子刺激后激活转录中的新型核作用.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 基因规则 基因规则
背景情况:
- 细胞因子信号通过IkappaB激酶 (IKK) 激活NF-kappaB通路.
- IKK-β对IkappaB降解至关重要,但IKK-alpha在NF-kappaB激活中的作用尚不清楚.
- 以前的研究表明IKK-alpha在IkappaBalpha酸化中的细胞质功能.
研究的目的:
- 研究IKK-alpha在NF-kappaB通路激活中的核功能.
- 阐明IKK-alpha调节NF-kappaB依赖基因表达的机制,独立于其细胞质中的作用.
主要方法:
- 在小鼠胚胎纤维细胞中进行基因破坏研究.
- 对NF-kappaB依赖转录诱导的分析.
- 同免疫沉试验用于研究蛋白质相互作用.
- 染色体免疫沉以评估促进体的招募和基因素的修饰.
主要成果:
- 在细胞核中,IKK-alpha的功能是在细胞因子刺激时激活NF-kappaB响应基因表达.
- IKK-alpha 与CREB结合蛋白和Rel A. 相互作用.
- IKK-alpha被招募到NF-kappaB促进体中,调解细胞因子诱导的酸化和基因组H3的乙化.
结论:
- IKK-alpha在NF-kappaB通路激活中发挥着关键的核作用.
- 这种核功能涉及基因组修饰,特别是基因组H3的酸化和乙化.
- 这些发现定义了NF-kappaB导向基因表达调节的新机制.
相关概念视频
Histone Modification
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 deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
NF-κB-dependent Signaling Pathway
The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
Histone Modification
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 deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
The JAK-STAT Signaling Pathway
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
PI3K/mTOR/AKT Signaling Pathway
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a rapamycin-insensitive companion...
TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...


