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相关概念视频

Restarting Stalled Replication Forks02:37

Restarting Stalled Replication Forks

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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,...
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Homologous Recombination02:31

Homologous Recombination

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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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The DNA Replication Fork01:02

The DNA Replication Fork

37.0K
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...
37.0K
DNA Damage can Stall the Cell Cycle02:37

DNA Damage can Stall the Cell Cycle

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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Fixing Double-strand Breaks02:04

Fixing Double-strand Breaks

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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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The Replisome03:01

The Replisome

35.1K
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...
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相关实验视频

Updated: Sep 20, 2025

Author Spotlight: Unveiling the Role of SNF2L in Replication Fork Stability and Genome Duplication
05:55

Author Spotlight: Unveiling the Role of SNF2L in Replication Fork Stability and Genome Duplication

Published on: August 23, 2024

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在BRCA2中,C端重组RAD51二极体,以结合B-DNA,以实现复制叉稳定性.

Michael A Longo1, Syed Moiz Ahmed2, Yue Chen3

  • 1Department of Molecular & Cellular Oncology, UT MD Anderson Cancer Center, Houston, TX 77030, USA.

Molecular cell
|May 29, 2025
PubMed
概括

重新评估了乳腺癌敏感性蛋白2 (BRCA2) 和RAD51的相互作用. 新发现显示BRCA2 C终端切换RAD51功能从DNA修复到分叉保护,影响癌症病因学.

关键词:
这就是BRCA2的原因.在Rad51中使用了Rad51.在SIRF中,SIRF就是SIRF.癌症 癌症 癌症 癌症 癌症晶体结构 晶体结构基因组稳定性的基因组稳定性同质性导向的维修是指导维修.复制叉的保护 复制叉的保护

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Visualization of DNA Repair Proteins Interaction by Immunofluorescence
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Visualization of DNA Repair Proteins Interaction by Immunofluorescence

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Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51
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Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51

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相关实验视频

Last Updated: Sep 20, 2025

Author Spotlight: Unveiling the Role of SNF2L in Replication Fork Stability and Genome Duplication
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Visualization of DNA Repair Proteins Interaction by Immunofluorescence
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Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51
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Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51

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科学领域:

  • 分子生物学分子生物学
  • 结构生物学 结构生物学
  • 癌症研究 癌症研究

背景情况:

  • 乳腺癌敏感性蛋白2 (BRCA2) 和RAD51对于DNA修复和基因组稳定性至关重要.
  • 人们认为BRCA2 C终端稳定了RAD51,用于同源导向的DNA断裂修复 (HDR).

研究的目的:

  • 阐明BRCA2-RAD51相互作用在DNA修复和复制分叉保护 (FP) 中的结构机制.
  • 挑战BRCA2-RAD51功能在癌症病因和治疗耐药性的既定模型.

主要方法:

  • 详细的结晶结构确定与ATP结合的RAD51.1复合的BRCA2C终端相互作用域 (TR2i).
  • 使用接口引导突变的生物化学测定和分子分析.

主要成果:

  • 在BRCA2 TR2i域诱导独特的ATP-RAD51二聚合体构造,促进双链B-DNA结合.
  • 这种相互作用促进复制分叉保护 (FP) 与同质导向修复 (HDR) 相比,通过全质调节RAD51.
  • 在BRCA2 (S3291/P3292) 上的一个循环素依赖激酶 (CDK) 酸化位调节FP和HDR阶段之间的RAD51活性.

结论:

  • BRCA2 C 终端作为一个全osteric ,切换 RAD51 的 DNA 结合偏好从单链到双链 DNA.
  • 这种机制在S阶段强制执行复制分叉保护 (FP),挑战了当前的BRCA2-RAD51教条.
  • 了解这种开关对于癌症病因学和开发针对耐治疗癌症的新疗法策略至关重要.