関連する実験動画
Updated: May 23, 2026
07:27
Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
Published on: April 30, 2010
ヘッドオンRNAポリメラーゼによって停止した複製フォークの直接再起動
Richard T Pomerantz1, Mike O'Donnell
1The Rockefeller University, Howard Hughes Medical Institute, 1230 York Avenue, New York, NY 10021, USA.
Science (New York, N.Y.)
|January 30, 2010
まとめ
バクテリアのレプリソームは,転写複合体と衝突すると安定し,最終的にRNAポリメラーゼ (RNAP) を置き換えてDNA複製を再開します. Mfdタンパク質は,この再起動を助け,複製フォークの進行における転写結合修復の役割を強調します.
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:
- 複製フォークは,ヘッド・オン・トランスクリプション・コンプレックスに遭遇すると停止する可能性があります.
- これらの衝突の正確な分子イベントと結果は完全に理解されていません.
研究 の 目的:
- 複製機構とRNAポリメラーゼ (RNAP) が正面衝突した後の運命を調査する.
- 複製フォークの安定性と再起動を制御するメカニズムを解明する.
主な方法:
- エシェリキア・コリで実施したイン・ビボ試験.
- 複製フォークのダイナミクスとRNAポリメラーゼの相互作用の観察.
主要な成果:
- Escherichia coliのレプリソームは,ヘッド・オン・トランスクリプション・コンプレックスとの衝突で停止する.
- 複製フォークは安定し,最終的にRNAPを移動した後,延長を再開します.
- 転写-修復結合因子MfdはRNAPの異位を容易にし,フォーク再起動を促進する.
結論:
- バクテリアの複製フォークは,固有の安定性を持ち,ヘッド・オン・トランスクリプション・ブロックを克服することができます.
- Mfd経由の転写結合修復経路は,停滞した複製フォークを再起動する上で重要な役割を果たします.
関連する概念動画
01:02The DNA Replication Fork
An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork. Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
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...
01:02The DNA Replication Fork
An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork. Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
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...