CDKは,Cdc6をAPC/C依存型タンパク質分解から保護することによって,ヒト細胞におけるDNA複製の起源許可を促進する
Niels Mailand1, John F X Diffley
1Cancer Research UK London Research Institute, Clare Hall Laboratories, Hertfordshire, United Kingdom.
Cell
|September 13, 2005
まとめ
サイクリン依存キナーゼ (CDK) は通常,DNA複製の許可を防ぐが,ここではCdc6タンパク質を安定させる. この安定化は,細胞分裂前の重要なステップである,複製前の複合体の組み立てを可能にします.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- サイクリン依存キナーゼ (CDKs) は細胞サイクルを調節し,DNA複製の起源発火を細胞サイクル1回に制限する.
- CDKは,G1フェーズ外でのプレレプリケーション複合体 (pre-RC) アセンブリを防止し,これはライセンス化と呼ばれるプロセスです.
- 皮肉なことに,サイクリンE-cdk2のような特定のCDKも,ライセンス提供を促進するために必要である.
研究 の 目的:
- DNA複製ライセンスの規制におけるCDKの二重な役割を調査する.
- CDKが特定の条件の下でライセンス提供を促進するメカニズムを明らかにする.
- 本質的なライセンシング要因 Cdc6.6 の規制を理解する.
主な方法:
- Cdc6.6の調査されたCDKリン酸化.
- Cdc6とアナフェーズ促進複合体/サイクロソーム (APC/C) の相互作用を評価した.
- 静止細胞と再侵入細胞でCdc6タンパク質分解とRC前組成を分析した.
主要な成果:
- CDKのリン酸化は,APC/C媒介によるCdc6の分解を阻害することによってCdc6を安定させる.
- APC/C依存のCdc6タンパク質分解は,静止細胞におけるRC前組成を防止する.
- CDK媒介によるCdc6の安定化により,細胞サイクル再突入の際にライセンシング阻害剤 (ジェミニン,サイクリンA) よりも前に蓄積することが可能になる.
結論:
- 新しいメカニズムはタンパク質の安定性を調節し,Sフェーズ前のRC前組立のための重要なウィンドウを確立します.
- このCDKに依存するCdc6の安定化は,サイクリンEの重要な機能として提案されています.
- この規則を理解することは,細胞サイクル制御とDNA複製の開始を理解するために非常に重要です.
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S-Cdk Initiates DNA Replication
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
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...
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...
S-Cdk Initiates DNA Replication
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.


