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相关概念视频

Eukaryotic Transcription Inhibitors01:52

Eukaryotic Transcription Inhibitors

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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
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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...
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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.
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The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
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Updated: Mar 6, 2026

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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通过多站位酸化,ERK抑制了Capicua抑制器的功能.

Sayantanee Paul1,2, Khandan Ilkhani1, Nathan Strozewski1

  • 1Department of Biology, University of Massachusetts Boston, Boston, MA 02125, USA.

Journal of cell science
|March 5, 2026
PubMed
概括
此摘要是机器生成的。

细胞外信号调节激酶 (ERK) 信号调节细胞生长和存活. 这项研究确定了Capicua (Cic) 蛋白的关键酸化部位,揭示了ERK如何控制Cic活动和降解.

关键词:
卡皮克瓦 (Capicua) 是一个古老的植物.这种植物是Drosophila.埃尔克·埃尔克是什么意思多站点酸化的方法酸盐的降解发生在酸盐中

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科学领域:

  • 分子生物学分子生物学
  • 细胞信号传递 细胞信号传递
  • 遗传学 遗传学 是一个

背景情况:

  • 受体氨酸激酶 (RTK) /细胞外信号调节激酶 (ERK) 途径对细胞功能至关重要.
  • (Cic) 是ERK准的转录抑制剂;人类CIC的突变与疾病有关.
  • 了解ERK的Cic酸化对于破译其调节机制至关重要.

研究的目的:

  • 识别和描述Drosophila Cic上特定的酸化位点,这些位点是ERK的目标.
  • 通过使用突变的Cic变异来验证这些酸盐在体内发育功能.
  • 阐明多站位酸化在Cic下调和降解中的作用.

主要方法:

  • 蛋白组分析以确定Cic.上潜在的ERK点.
  • 局部定向的突变发生,以产生具有突变的酸盐的Cic变体.
  • 在Drosophila的体内功能测试中,评估突变对Cic活动和降解的影响.

主要成果:

  • 识别了多个直接被ERK准的高可靠性Cic酸盐.
  • 在20个部位突变的CIC显示对蛋白质体降解的抵抗力,作为"超级抑制剂".
  • ERK需要同时对多个Cic位点进行酸化,以实现完全的下调,这表明酸化退化机制.

结论:

  • 通过ERK进行多站点酸化对于Cic的功能下调和降解至关重要.
  • 这种机制涉及到像Ago/FBXW7.7这样的泛素合酶所识别的化.
  • 这些发现为RTK/ERK路径下游的信号解释提供了关键的见解.