作为Smad共因子,E2F4/5和p107将TGFbeta受体与c-myc抑制联系起来
Chang-Rung Chen1, Yibin Kang, Peter M Siegel
1Cell Biology Program, Howard Hughes Medical Institute, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.
Cell
|August 2, 2002
概括
Smad3蛋白调解基因转录的激活和抑制. 它激活细胞循环抑制剂,并通过形成转移到细胞核的复合体来抑制生长基因c-myc.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 转化生长因子-β (TGFbeta) 受体信号通路在细胞过程中起着至关重要的作用.
- Smad3是TGFbeta信号传递的关键调解者,已知可以激活像循环林依赖性激酶抑制剂这样的基因,诱导细胞静止.
- 通过Smad3调节促进生长的基因的精确机制仍然不太清楚.
研究的目的:
- 阐明Smad3调解增长促进基因c-myc.c的转录抑制的机制.
- 为了确定参与Smad3-介导抑制的蛋白质复合体和调节元素.
- 了解Smad蛋白质如何根据它们的合作伙伴来调解不同的转录结果.
主要方法:
- 同免疫沉用于识别蛋白质复合体.
- 亚细胞局部化研究 (例如,免疫光) 来追踪复杂的转位.
- 记者基因测试以评估转录活性.
- 对结合部位的基因促进子区域的分析.
主要成果:
- 确定了一种包含Smad3,E2F4/5,DP1和p107的先前存在的细胞质复合体.
- 在TGFβ刺激下,这个复合体转移到核中.
- 在核中,该复合物与Smad4结合,并与c-myc基因促进体上的复合Smad-E2F位点结合,导致抑制.
- E2F4/5和p107作为TGFbeta受体信号的转换器,在循环林依赖激酶 (cdk) 的上游起作用.
结论:
- Smad3可以通过与E2F4/5,DP1和p107.7形成一个新的复合体来调解c-myc的转录抑制.
- 这种复合体在TGFbeta受体信号传递和细胞生长调节之间起着至关重要的作用.
- 斯马德蛋白具有功能多功能性,根据它们的相互作用伙伴,可以调解转录激活或抑制.
更多相关视频
06:54Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
Published on: October 27, 2020
13.1K
11:38Visualization and Quantification of TGFβ/BMP/SMAD Signaling under Different Fluid Shear Stress Conditions using Proximity-Ligation-Assay
Published on: September 14, 2021
2.4K
相关概念视频
Negative Regulator Molecules
32.1K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
32.1K
Co-activators and Co-repressors
6.9K
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...
6.9K
Master Transcription Regulators
6.0K
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...
6.0K
Abnormal Proliferation
4.0K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.0K
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
TGF - β Signaling Pathway
7.2K
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...
7.2K
