相关实验视频
Updated: Jul 15, 2026

07:27
Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
Published on: April 29, 2010
概括
R6K等离子体启动蛋白与特定的DNA部位结合,包括I部位的多重重复和II部位的单重复. 这种结合相互作用对于启动DNA复制至关重要,并可能解释启动蛋白合成的自我调节.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物化学 生物化学
背景情况:
- 等离子体R6K复制的启动是由一个特定的启动蛋白调节的.
- 启动蛋白与两个不同的DNA区域结合:I区和II区.
- 之前的研究证实了发起者与这些部位的结合.
研究的目的:
- 精确地绘制R6K启动蛋白在等离子体DNA上的结合部位.
- 为了确定参与启动器结合的特定DNA序列和接触.
- 通过促进体封闭阐明启动蛋白自我调节的机制.
主要方法:
- DNAase I 足迹识别R6K DNA上的启动器结合区域.
- 使用二甲基硫酸盐进行化学探测,以确定氨酸残留接触物.
- 在Site I和Site II的单个/部分重复中分析启动器绑定到并列重复.
主要成果:
- 启动蛋白结合于第I位点的7个并列22bp重复.
- 在Site II中,绑定发生在一个单一的共识重复和两个部分重复重叠的推动者.
- 硫酸二甲基探测发现了特定的 purin 接触点,其中大多数位于 Site I 的单一 DNA 链上.
结论:
- 已经阐明了R6K启动蛋白与其DNA位点的详细结合相互作用.
- 在II位点的结合,特别是与促进体的重叠,为通过促进体封闭的启动蛋白合成的自我调节提供了分子基础.
相关概念视频
Replication in Prokaryotes
Overview
The 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...
S-Cdk Initiates DNA Replication
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
The 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...
Replication in Prokaryotes
DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
Many Proteins Work Together to Replicate the Chromosome
Replication is coordinated and carried out by a host of specialized...
Many Proteins Work Together to Replicate the Chromosome
Replication is coordinated and carried out by a host of specialized...
S-Cdk Initiates DNA Replication
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of replication.

