ヒト細胞周期のG1段階におけるサイクリンE-cdk2複合体の形成と活性化
1Department of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA 98104.
Science (New York, N.Y.)
|September 18, 1992
まとめ
ヒトのサイクリンEタンパク質は,サイクリン依存キナーゼ2 (Cdk2) と提携し,G1期間の細胞分裂を調節する. このサイクリン-Cdk2複合体は,真核生物の細胞増殖に極めて重要です.
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:
- ヒューマン・サイクリンEは当初,酵母におけるG1サイクリンとしての役割のために特定されました.
- 細胞循環の調節は,真核生物の基本的なプロセスである.
研究 の 目的:
- 細胞周期調節におけるヒトサイクリンEの役割を調査する.
- ヒトのサイクリンEに関連したキナーゼと,細胞周期中のその活性を特定するために.
主な方法:
- バイオケミカルアッセイでキナーゼ活性が検出される.
- タンパク質の豊富さを評価するための免疫ボルトリング.
- 細胞サイクル同期と分析.
主要な成果:
- サイクリンEは,ヒト細胞の細胞周期調節タンパク質キナーゼと関連しています.
- サイクリンEに関連したキナーゼ活動のピークは,G1フェーズ中に発生しました.
- 主要なサイクリンE関連キナーゼはCdk2 (サイクリン依存キナーゼ2) と特定されました.
- サイクリンEとサイクリンE-Cdk2複合体の豊富性は,G1相細胞で最も高かった.
- 細胞サイクルからの脱出 (差別化または血清離脱) 時にキナーゼ活性が低下した.
結論:
- サイクリン-Cdk複合体の組み立ては,G1相細胞増殖経路における重要なステップです.
- サイクリンE-Cdk2複合体は,ヒト細胞のG1期間の細胞増殖を制御する上で重要な役割を果たします.
- この発見は,真核細胞の細胞周期制御におけるサイクリン-Cdk複合体の保存された役割を支持する.
関連する概念動画
01:45Positive Regulator Molecules
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02:39Positive Regulator Molecules
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02:38S-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.
02:15M-Cdk Drives Transition Into Mitosis
Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
02:38S-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.
02:15M-Cdk Drives Transition Into Mitosis
Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...