関連する実験動画
Updated: Aug 2, 2026
07:27
Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
Published on: April 29, 2010
DNA複製フォークは,新生トランスクリプトを移動させずにRNAポリメラーゼを通過することができます.
1Department of Biochemistry & Biophysics, University of California, San Francisco 94143-0448.
Nature
|November 4, 1993
まとめ
バクテリオファージのT4複製フォークは,DNA複製中にEscherichia coliのRNAポリメラーゼをバイパスすることができます. 酵素はトランスクリプトを保持し,RNA合成を再開させ,トランスクリプト保存のための進化的適応を示します.
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:
- DNAの複製と転写は,細胞の基本的なプロセスである.
- 複製と転写の機械の間の相互作用は,課題をもたらす可能性があります.
- バクテリオファージT4は,DNA複製を研究するためのモデルシステムを提供します.
研究 の 目的:
- バクテリオファグのT4複製フォークとEscherichia coliのRNAポリメラーゼの間のインビトロ相互作用を調査する.
- 進行中の複製フォークに出くわしたときのRNAポリメラーゼ複合体とそのトランスクリプトの運命を決定する.
主な方法:
- 細菌のT4タンパク質を用いたインビトロDNA複製アッセイ.
- 複製後のフォーク通過後のRNAポリメラーゼ複合体の安定性と転写活動の生化学分析.
主要な成果:
- バクテリオファージのT4複製フォークは,同じ方向に移動するEscherichia coli RNAポリメラーゼを成功裏に通過しました.
- RNAポリメラーゼ三重転写複合体はDNAに結合し,その転写バブルを維持した.
- バイパスされたRNAポリメラーゼは忠実なRNA合成を再開し,トランスクリプト保持を示した.
結論:
- Escherichia coliのRNAポリメラーゼは,複製フォーク通過中にそのトランスクリプトを保持するメカニズムを進化させた.
- この適応は,部分的に合成されたRNA分子の完全性を確保し,完成を可能にします.
- この発見は,DNA複製と転写の連携を in vivo で明らかにした.
さらに関連する動画
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...