関連する実験動画
Updated: Aug 6, 2026
15:57
Visualizing Single-molecule DNA Replication with Fluorescence Microscopy
Published on: October 9, 2009
DNA複製フォークの解剖学は,SV40 DNA複製の in vitro 再構成によって明らかになりました
1Cold Spring Harbor Laboratory, New York 11724.
Nature
|May 19, 1994
まとめ
研究者らは,T抗原と細胞タンパク質を用いて,シミアンウイルス40のDNA複製を再構成した. DNAポリメラーゼ-アルファ/プリマゼは複製を開始し,DNAポリメラーゼ-デルタは複製因子Cと増殖細胞核抗原を併用して両方のDNA鎖を複製する.
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:
- シミアンウイルス40 (SV40) は,真核生物のDNA複製のモデルとして機能する.
- DNA複製の酵素機構を理解することは,細胞のプロセスにとって極めて重要です.
研究 の 目的:
- SV40DNA起源の完全な酵素複製を in vitro で再構成する.
- SV40 DNA複製におけるT抗原とDNAポリメラーゼを含む特定のタンパク質の役割を解明する.
主な方法:
- 浄化されたT抗原と細胞タンパク質を用いたSV40DNA複製の再構成.
- DNAポリメラーゼ-アルファ/プリマゼ,複製因子C,増殖細胞核抗原の機能の分析.
主要な成果:
- DNAポリメラーゼ-アルファ/プリマゼは,複製開始のためのRNA-DNAプライマーとオカザキ断片を合成する.
- 複製因子Cと増殖細胞核抗原を含むポリメラーゼスイッチングメカニズムにより,DNAポリメラーゼ-デルタは両方のDNA鎖を同時に複製することができます.
結論:
- この研究では,SV40のDNA複製を成功裏に再構築し,主要なタンパク質プレーヤーとその機能を特定しました.
- DNAのダブルヘリクスの協調複製には,新しいポリメラーゼスイッチングメカニズムが不可欠である.
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...
01:29Replication 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...
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...