関連する実験動画
Updated: Jul 15, 2026

07:27
Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
Published on: April 29, 2010
まとめ
R6Kプラズミドイニシアタータンパク質は,特定のDNA部位に結合し,部位Iで複数の繰り返し,部位IIで単一の繰り返しを含む. この結合相互作用は,DNA複製の開始に不可欠であり,開始タンパク質合成の自己調節を説明する可能性がある.
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
- バイオケミストリー バイオケミストリー
背景:
- プラズミドR6Kの複製の開始は,特定のイニシアタータンパク質によって制御されます.
- イニシアタータンパク質は,サイトIとサイトIIの2つの異なるDNA領域に結合します.
- 以前の研究では,イニシアターのこれらのサイトへの結合が確認されました.
研究 の 目的:
- プラズミドDNAのR6Kイニシアタータンパク質の結合部位を正確にマッピングする.
- イニシアター結合に関与する特定のDNA配列とコンタクトを決定する.
- プロモーターオクラージョンによるイニシアタータンパク質の自己調節のメカニズムを解明する.
主な方法:
- DNAase Iの足跡は,R6K DNAのイニシアター結合領域を識別する.
- ディメチル硫酸塩を用いた化学探査で, purin残留接触者を決定する.
- サイトIのタンデムリピートとサイトIIの単体/部分リピートのイニシアター・バインディングの分析.
主要な成果:
- イニシアタータンパク質は,サイトIで7つのタンデム22bpのリピートに結合する.
- サイトIIでは,結合は単一のコンセンサスリピートと,プロモーターが重なり合う2つの部分リピートで起こります.
- ディメチル硫酸塩の探査により,特定のピューリン接触が特定され,そのほとんどはサイトIの単一のDNA鎖にありました.
結論:
- R6Kイニシアタータンパク質とそのDNA部位との詳細な結合相互作用が解明されました.
- サイトIIの結合,特にプロモーターとの重複は,プロモーター閉塞を通じたイニシアタータンパク質合成の自己調節のための分子基盤を提供します.
関連する概念動画
Replication in Prokaryotes
Overview
The 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...
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.
The 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...
Replication in Prokaryotes
DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
Many Proteins Work Together to Replicate the Chromosome
Replication is coordinated and carried out by a host of specialized...
Many Proteins Work Together to Replicate the Chromosome
Replication is coordinated and carried out by a host of specialized...
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.

