相关实验视频
Updated: Aug 14, 2026
07:27
Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
Published on: April 29, 2010
由两个不同的聚合酶复合体在SV40DNA复制起源处顺序启动滞后和领先链合成
T Tsurimoto1, T Melendy, B Stillman
1Cold Spring Harbor Laboratory, New York 11724.
Nature
|August 9, 1990
概括
研究人员使用八个组件在体外重建了DNA复制. DNA聚合酶α-原酶启动合成,其次是DNA聚合酶delta,其中一些 prokaryotic聚合酶替代delta,并提出了聚合酶切换的模型.
科学领域:
- 分子生物学分子生物学
- 病毒学 病毒学
- 生物化学 生物化学
背景情况:
- DNA复制是细胞分裂和生物发育所必不可少的基本生物过程.
- 了解DNA复制启动的精确机制对于理解基因组稳定性和疾病病原性至关重要.
研究的目的:
- 重建DNA的酶合成从猿类病毒的DNA复制的40来源在体外.
- 阐明特定DNA聚合酶复合体在复制过程中启动和延长DNA链中的作用.
- 在DNA复制开始时开发聚合酶切换模型.
主要方法:
- 使用八个纯化的蛋白质成分重建DNA复制.
- 在体外酶分析以监测DNA合成.
- 利用猿人病毒40的DNA复制起源作为一个模型系统.
主要成果:
- DNA聚合酶α-原酶复合体被确定为在复制起源和滞后链聚合酶的DNA合成的发起者.
- 发现DNA聚合酶三角复合体可以在主链模板上启动复制.
- 某些 prokaryotic DNA 聚合酶复合体显示出替代真核细胞 DNA 聚合酶 delta 复合体的能力.
结论:
- 已经建立了一个功能性的体外系统,用于启动DNA复制,使用纯化的组件.
- 已经提出了聚合酶切换的模型,涉及DNA聚合酶α-原酶和DNA聚合酶delta的顺序作用.
- 基因聚合酶的功能性保存表明不同生物体的共享机制.
相关概念视频
02:31Replication in Eukaryotes
Overview
02:31Replication in Eukaryotes
Overview
01:59Lagging 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...
01:59Lagging 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...
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...
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...