CDK阻害体のマルチサイトリン酸化は,DNA複製の発症の値を設定する
1Programme in Molecular Biology and Cancer, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto M5G 1X5, Canada.
Nature
|December 6, 2001
まとめ
Cdc4のようなSCFユビキチンリガゼは,分解のためにリン酸化タンパク質を標的とする. このプロセスは,Fボックスタンパク質とリン酸化値を含むもので,DNA複製のG1相のような適切な細胞サイクルタイミングを保証します.
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.
- バイオケミストリー バイオケミストリー
背景:
- SCFユビキチンリガゼは,F-ボックスタンパク質アダプタを通してタンパク質の分解を媒介する.
- Fボックスタンパク質Cdc4は,サイクリンに依存したキナーゼ阻害体Sic1を標的とし,G1フェーズで分解する.
- この分解は,DNA複製と細胞サイクル進行の開始に不可欠です.
研究 の 目的:
- Cdc4が基板Sic1.1と結合するメカニズムを調査する.
- リン酸化部位がSic1の分解のタイミングをどのように調節するかを理解する.
- 細胞サイクルの値の確立におけるサブ最適の結合モチーフの役割を調査する.
主な方法:
- Cdc4 と Sic1.1 のタンパク質相互作用の分析
- Cdc4フォスフォ・デグロン (CPD) モチーフの特徴.
- リン酸化部位変異がSic1の分解と細胞サイクル進行に与える影響を評価するためのインビボ試験.
主要な成果:
- Cdc4は,CPDモチーフを認識し,その WD40リピートドメインを通じて,リン酸化されたSic1に結合します.
- Sic1は,集団的にCdc4結合を媒介する複数のサブ最適のCPDモチーフを有しています.
- これらの弱い結合部位は,リン酸化に依存する値を作り,Sic1の分解を遅らせ,最小限のG1相期間を確保します.
結論:
- マルチサイトリン酸化と不最適の結合モチーフは,タンパク質とタンパク質の相互作用における規制的値の確立のための一般的なメカニズムとして機能します.
- このメカニズムは,DNA複製のタイミングなどの細胞サイクルイベントの正確な制御を保証します.
- この発見は,タンパク質の転用と細胞サイクル制御の調節に関する洞察を提供します.
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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).
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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.


