ORCとCdc6pは相互作用し,ゲノム内のDNA複製の開始頻度を決定する
C Liang1, M Weinreich, B Stillman
1Cold Spring Harbor Laboratory, New York 11724, USA.
Cell
|June 2, 1995
まとめ
起源認識複合体 (ORC) とCdc6タンパク質は,酵母におけるDNA複製を開始するために協力します. ORCにおける突然変異は,活性複製原点の数を減少させ,それらの重要な役割を強調する.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- 細胞生物学 細胞生物学
背景:
- 起源認識複合体 (ORC) は,真核細胞におけるDNA複製の開始に不可欠である.
- 複製の起源の選択におけるORCとその相互作用するタンパク質の正確な役割を理解することは極めて重要です.
研究 の 目的:
- 酵母におけるDNA複製の開始における起源認識複合体 (ORC) の機能を調査する.
- 複製を調節するためにORCと相互作用するタンパク質を特定し,特徴づけること.
- ORCとCdc6pが複製頻度を決定するメカニズムを解明する.
主な方法:
- 酵母 (Saccharomyces cerevisiae) の温度に敏感なオーク変異体を使用した.
- DNA複製の開始を分析するために二次元 (2D) ゲル電泳を用いた.
- オーク変異の抑制剤を特定するために遺伝子スクリーニングを実施しました.
- タンパク質とタンパク質の相互作用を確認するために生化学分析を行った.
主要な成果:
- orc2-1およびorc5-1変異体は,活性DNA複製原点の数が減少したことを示した.
- アクティブ・レプリカーターの数は,オーク・ミュータントの制限温度でさらに減少した.
- CDC6は,オーク5-1変異のマルチコピー抑制剤として特定されました.
- Cdc6pは,ORCと機能的にも物理的にも相互作用することが示されました.
結論:
- ORCとCdc6pは,複製の起源でプリレプリケーション複合体を形成する.
- ORCとCdc6pは,全ゲノムにわたるDNA複製開始の頻度を調節するために協力しています.
- これらの発見は,DNA複製制御の基本的メカニズムについての洞察を提供します.
関連する概念動画
Replication in Eukaryotes
Overview
Replication in Eukaryotes
Overview
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.
Replication 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...
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.
Replication 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...


