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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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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...
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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.
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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
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Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
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Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
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核肌酶VI维持了复制叉的稳定性

Jie Shi1, Kristine Hauschulte1, Ivan Mikicic1

  • 1Institute of Molecular Biology gGmbH (IMB), Ackermannweg 4, D - 55128, Mainz, Germany.

Nature communications
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氨酸VI稳定了核中的停滞的DNA复制分叉,与WRNIP1合作以防止降解. 这种核作用在复制应激过程中至关重要,独立于细胞质髓VI.

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科学领域:

  • 细胞生物学 细胞生物学
  • 分子生物学分子生物学
  • 遗传学 是一个遗传学.

背景情况:

  • 乙细胞骨架对细胞结构和动力学至关重要.
  • 纤维状动蛋白在细胞核中的存在和作用仍在争论中.
  • 了解核活性蛋白的功能是细胞可塑性的关键.

研究的目的:

  • 为了研究基于actin的运动肌肉蛋白VI在细胞核中的作用.
  • 为了确定DNA复制压力期间的肌酸VI的功能.
  • 为了澄清核与细胞质髓VI池的贡献.

主要方法:

  • 利用功能化的亲和力探针来操纵核肌肉素VI水平.
  • 研究了肌肉蛋白VI与停滞的复制分叉的相互作用.
  • 评估了myosin VI对核分解性降解的保护作用.

主要成果:

  • 肌酸VI直接与停滞或逆转的DNA复制分叉有关.
  • 髓VI与温纳酶相互作用蛋白1 (WRNIP1) 进行合作.
  • 这种复合体保护复制中间体免受DNA2介导的降解.
  • 有证据表明,在复制应激过程中,肌肉蛋白VI具有直接的核功能.

结论:

  • 肌酸VI在稳定核内停滞不前的复制分叉方面发挥着关键作用.
  • 核肌蛋白VI,而不是细胞质池,对于复制应激反应至关重要.
  • 这些发现解决了关于核活性运动功能的争议.