細胞周期制御におけるポリコンブ群タンパク質PSCの転写独立機能
Adone Mohd-Sarip1, Anna Lagarou, Cecile M Doyen
1Department of Biochemistry and Centre for Biomedical Genetics, Erasmus University Medical Centre, Post Office Box 1738, 3000 DR, Rotterdam, Netherlands.
まとめ
ポリコンブ群のタンパク質 後方性 (PSC) は細胞分裂において新しい役割を担っています. PSCは,Lemming (LMG) と協力して,細胞サイクル進行と発達に影響を与える,破壊のためのサイクリンBをマークします.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
背景:
- ポリコンブ群 (PcG) タンパク質は,転写抑制による発育と細胞増殖の重要な調節体である.
- 後方性 (PSC) は,これらのプロセスに関与する重要なPcGタンパク質です.
研究 の 目的:
- PSC.の転写独立機能の可能性を調査する.
- 細胞周期調節におけるPSCの役割を,その定式PcG機能を超えて解明する.
主な方法:
- タンパク質の関連性および無所不在性を調べるために,細胞ベースのアッセイ.
- 発見を検証するために再構成された生化学反応.
- サイクリンB破壊経路の分析.
主要な成果:
- 重要な部分のPSCは,正規のPCG複合体とは独立して機能する.
- PSCは,サイクリンB (CYC-B) とアナフェーズ促進複合体 (APC) と関連しています.
- PSCとLemming (LMG/APC11) は協力して,CYC-Bをオビキチラートし,それをプロテアソマル分解に標的とした.
結論:
- PSCは,転写抑制と転写後のミトーシスの調節の両方を媒介する.
- この二重機能は,PSCが細胞サイクル制御における重要な役割を強調し,発育と癌に影響を及ぼします.
- この発見は,APC経路を通じて細胞分裂を調節する新しいメカニズムを明らかにしています.
関連する概念動画
Negative Regulator Molecules
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.
Abnormal Proliferation
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 daughter...
Inhibition of Cdk Activity
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
Combinatorial Gene Control
Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...


