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相关概念视频

Restarting Stalled Replication Forks02:37

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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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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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相关实验视频

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Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51
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RAD51AP1是一个多功能RAD51调制器.

Lucas Kuhlen1,2, Bilge Argunhan1,2, Pengtao Liang1,2

  • 1Section of Structural and Synthetic Biology, Faculty of Medicine, Imperial College, London SW7 2AZ, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|December 3, 2025
PubMed
概括
此摘要是机器生成的。

RAD51AP1稳定了RAD51丝,这对于DNA修复和端粒维护至关重要. 这种蛋白质重塑RAD51,增强其DNA结合和链交换活动,以保持基因组稳定.

关键词:
在 RAD51 复合酶中.在RAD51AP1中使用.纤维丝的调制法.同类的重组组合.结构生物学结构生物学

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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
  • 癌症生物学 癌症生物学

背景情况:

  • RAD51AP1是同源重组 (HR) 和替代端粒延长 (ALT) 的关键因素.
  • RAD51AP1的枯竭会损害HR,而其过度表达与癌症恶性相关.
  • 对于RAD51AP1在调节中央HR蛋白RAD51中的确切作用,仍然基本上是未知的.

研究的目的:

  • 为了阐明RAD51AP1在调节RAD51重组酶中的迄今为止未知的作用.
  • 揭示RAD51AP1-RAD51相互作用的结构基础及其功能后果.
  • 了解RAD51AP1如何影响RAD51线程形成和DNA链交换.

主要方法:

  • 生物化学 生物化学
  • 结构生物学 (X射线晶体学)
  • 生物物理测定试验

主要成果:

  • RAD51AP1通过至少三个不同的RAD51结合位点与RAD51纤维结合.
  • 一种新的结合模式稳定了RAD51的N终端域和导线接口.
  • RAD51AP1稳定了RAD51-ssDNA丝,促进了链交换,并增强了RAD51的寡合化.
  • 结构数据显示,由RAD51AP1结合引起的形状变化促进了丝核和稳定.
  • RAD51-ssDNA丝的结构阐明了依赖ATP水解的结构变化和ADP对DNA结合的影响.

结论:

  • RAD51AP1充当了一种多功能RAD51调制器和光线重塑器.
  • 这些发现为RAD51光纤动力学和HR调制提供了分子洞察力.
  • 了解RAD51AP1的作用对于基因组稳定性和癌症研究至关重要.