関連する実験動画
Updated: Aug 9, 2026
10:55
Study of the DNA Damage Checkpoint using Xenopus Egg Extracts
Published on: November 5, 2012
タンパク質分解とDNA複製:クセノプスの卵細胞サイクルにおけるCDC34の要件
1Department of Cell Biology, Harvard Medical School, 25 Shattuck Street, Boston, MA 02115, USA.
Science (New York, N.Y.)
|September 12, 1997
まとめ
細胞分裂サイクル遺伝子CDC34は,Xenopus胚におけるDNA複製の開始に不可欠である. このユビキチン結合酵素は,Xic1.1.のような阻害剤を標的として,細胞サイクル進行を調節する.
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:
- 細胞分裂サイクル遺伝子CDC34は,G1調節体を分解し,芽生えた酵母でG1からS段階への細胞サイクルを前進させるのに不可欠です.
- 高級エウカリオットにおけるS相の開始におけるCDC34の役割は,未だに不明である.
研究 の 目的:
- 高級エウカリオット,特にXenopus laevisの胚におけるS相発症のためのCDC34の必要性を調査する.
- Cdc34pがDNA複製の開始と細胞サイクル進行を調節するメカニズムを解明する.
主な方法:
- Xenopus laevisの卵の単純な胚細胞サイクルを研究した.
- 大分子サイズの複合体内のCdc34pの機能を分析した.
- Cdk2-サイクリンEとCdc34pの相互作用とXenopusのcdk阻害体Xic1.1.の相互作用を調査しました.
主要な成果:
- Cdc34pは,大きな分子複合体の一部として,Xenopus胚におけるDNA複製の開始に不可欠であることが判明しました.
- Cdc34pは,Cdk2-サイクリンEのイニシアチブ機能を調節しているようです.
- この調節は,Xenopus cdk inhibitor,Xic1.1.のユビキチン媒介による分解によって起こる可能性があります.
結論:
- CDC34は,DNA複製の開始と,より高い真核生物におけるS相の発症において重要な役割を果たします.
- Cdc34pは,Cdk2-サイクリンE複合体の主要な調節体として作用し,おそらくその阻害体Xic1.1を分解することによって作用する.
- これらの発見は,CDC34の既知の機能を芽生えた酵母以外の領域に拡張し,細胞サイクル制御における保存された重要性を強調しています.
関連する概念動画
02:31Replication in Eukaryotes
Overview
03:01The Replisome
DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
02:37Restarting Stalled Replication Forks
DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart, a...
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.
01:29Replication in Eukaryotes
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
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.