DNA复制,细菌细胞循环,以及细胞生长
1Department of Biology, San Diego State University, California 92182.
Cell
|April 3, 1992
概括
在oriC的DNA复制启动受到细胞生长速度的严格控制. 半甲基化GATC位点和DnaA蛋白度调节复制轮,确保与细胞分裂的协调.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 微生物学 微生物学
背景情况:
- 启动DNA复制是一个关键的细胞周期事件.
- 复制的起源 (oriC) 和其调节是控制DNA合成的关键.
- 细胞生长速度影响DNA复制时间.
研究的目的:
- 阐明将DNA复制与细胞生长相连接的机制.
- 了解 oriC 启动是如何在复制后进行调节的.
- 研究DnaA蛋白和GATC甲基化在复制控制中的作用.
主要方法:
- 该研究的重点是细菌中ORIC启动的调节.
- 对DnaA蛋白结合和GATC甲基化状态的分析.
- 研究生长率和 (p) pGpp对基因转录的影响.
主要成果:
- 从新合成的起源重新启动被"日食阶段"阻止.
- 在 oriC 中的半甲基化 GATC 位点与外膜相关,延迟 DnaA 结合.
- 来自mioC和gid促进者的DNA度和转录控制了随后的启动事件.
- 根据生长速度调节的 (p) pGpp水平,反过来影响dnaA,myoC和gid转录.
结论:
- 细胞生长速度精确地协调DNA复制与细胞分裂,通过ORIC的调节元素.
- 基因甲基化,DNA可用性和转录控制之间的相互作用确保了及时的复制启动.
- 这种调节网络允许细菌根据营养的可用性和生长条件调整DNA复制频率.
相关概念视频
02:35Replication in Prokaryotes
Overview
02:35Replication in Prokaryotes
Overview
02:38S-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.
01:32Replication 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...
02:38S-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.
01:26Binary Fission
Binary fission is the primary mode of asexual reproduction in prokaryotes, such as bacteria. It results in the production of two genetically identical daughter cells. This highly efficient process ensures the rapid propagation of bacterial populations under favorable conditions and involves coordinated cellular and molecular events.DNA Replication and SeparationThe process begins with the replication of the bacterial chromosome. The circular DNA molecule unwinds at a specific origin of...