税收蛋白与MEKK1结合,刺激IkappaB激酶活性和NF-kappaB激活
M J Yin1, L B Christerson, Y Yamamoto
1Department of Medicine, Harold Simmons Cancer Center, University of Texas Southwestern Medical Center, Dallas 75235-8594, USA.
Cell
|June 18, 1998
概括
HTLV-I Tax蛋白通过与MEKK1结合来激活NF-kappaB信号,从而增强IKKbeta活动. 这种相互作用促进IkappaB的α降解,导致NF-kappaB的核转位和炎症反应.
科学领域:
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
背景情况:
- 核因子卡帕B (NF-kappaB) 调节炎症和免疫反应.
- 人类T淋巴细胞病毒I型 (HTLV-I) 转变蛋白,Tax,激活NF-kappaB.
研究的目的:
- 阐明tax蛋白激活NF-kappaB.B.的机制.
- 调查MEKK1和IKKbeta在税收中介NF-kappaB激活中的作用.
主要方法:
- 同免疫沉测试检测蛋白质与蛋白质相互作用.
- 激酶测试用于测量酶活性.
- 西方涂抹用于评估蛋白质酸化和降解.
- 使用主导阴性突变体来阻断信号通路.
主要成果:
- 纳税蛋白直接与MEKK1.1的氨基末端结合.
- 税表达刺激MEKK1激酶活性.
- 税收增强了IKKbeta的活性,导致IkappaB的α酸化和降解.
- MEKK1和IKKbeta对于税收中介的NF-kappaB激活至关重要.
- 重组MEKK1刺激IKKbeta活动.
结论:
- 在税收中介的NF-kappaB的激活取决于税收和MEKK1.1之间的相互作用.
- 这种相互作用导致增强的MEKK1和IKKbeta激酶活性.
- 该途径涉及对MEKK1的税收约束,随后的MEKK1激活,增加IKKbeta活动,IkappaBα降解,最终NF-kappaB核转移.
相关概念视频
NF-κB-dependent Signaling Pathway
7.6K
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...
NF-κB-dependent Signaling Mechanism
The...
7.6K
Regulation of the Unfolded Protein Response
2.2K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.2K
MAPK Signaling Cascades
7.3K
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
7.3K
The JAK-STAT Signaling Pathway
10.2K
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...
10.2K
PI3K/mTOR/AKT Signaling Pathway
5.1K
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...
5.1K
Calmodulin-dependent Signaling
5.0K
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
5.0K


