関連する実験動画
Updated: Aug 14, 2026

07:27
Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
Published on: April 29, 2010
SV40 DNA複製の原点にある2つの異なるポリメラーゼ複合体による遅滞および先導鎖合成の連続的開始
T Tsurimoto1, T Melendy, B Stillman
1Cold Spring Harbor Laboratory, New York 11724.
Nature
|August 9, 1990
まとめ
研究者は8つのコンポーネントを使用して,インビトロでDNA複製を再構成しました. DNAポリメラーゼアルファプリマゼが合成を開始し,その後DNAポリメラーゼデルタが始まり,一部のプロカリオットポリメラーゼがデルタを代用し,ポリメラーゼスイッチングのモデルが提案されています.
科学分野:
- 分子生物学は分子生物学である.
- ウイルス学 ウイルス学 ウイルス学
- バイオケミストリー バイオケミストリー
背景:
- DNA複製は,細胞分裂と生物の発達に不可欠な基本的な生物学的プロセスです.
- DNA複製の開始の正確なメカニズムを理解することは,ゲノム安定性と疾患の病原性を理解するために不可欠です.
研究 の 目的:
- シミアンウイルスのDNAの酵素合成を再構成する 40 DNA複製の起源 in vitro.
- 複製中のDNA鎖の開始と延長における特定のDNAポリメラーゼ複合体の役割を解明する.
- DNA複製の開始時にポリメラーゼスイッチングのモデルを開発する.
主な方法:
- 8つの精製されたタンパク質成分を用いたDNA複製の再構成.
- DNA合成をモニターするためのインビトロ酵素測定法.
- DNA複製の原点であるシミアンウイルス40をモデルシステムとして利用.
主要な成果:
- DNAポリメラーゼアルファプリマゼ複合体は,複製の起源と遅れた鎖ポリメラーゼにおけるDNA合成のイニシアターとして特定されました.
- DNAポリメラーゼデルタ複合体は,リードストランドテンプレートで複製を開始することが判明しました.
- 特定のプロカリオットDNAポリメラーゼ複合体は,真核生物DNAポリメラーゼ複合体デルタを代用する能力を示した.
結論:
- 精製された成分を使用して,DNA複製の開始のための機能的なin vitroシステムが確立されています.
- DNAポリメラーゼアルファプリマゼとDNAポリメラーゼデルタの連続的な役割を含むポリメラーゼスイッチングのモデルが提案されています.
- DNAポリメラーゼの機能的保存は,異なる生物間で共通のメカニズムを示唆しています.
関連する概念動画
Replication in Eukaryotes
Overview
Replication in Eukaryotes
Overview
Lagging Strand Synthesis
During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
There are several major differences between synthesis of the leading strand and synthesis of the lagging strand. 1) Leading strand synthesis happens in the direction of replication fork opening, whereas lagging strand synthesis happens in the...
There are several major differences between synthesis of the leading strand and synthesis of the lagging strand. 1) Leading strand synthesis happens in the direction of replication fork opening, whereas lagging strand synthesis happens in the...
Lagging Strand Synthesis
During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
There are several major differences between synthesis of the leading strand and synthesis of the lagging strand. 1) Leading strand synthesis happens in the direction of replication fork opening, whereas lagging strand synthesis happens in the...
There are several major differences between synthesis of the leading strand and synthesis of the lagging strand. 1) Leading strand synthesis happens in the direction of replication fork opening, whereas lagging strand synthesis happens in the...
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...
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...

