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相关概念视频

Replication in Eukaryotes02:31

Replication in Eukaryotes

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Overview
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DNA Replication02:40

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DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
Replication in Prokaryotes
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Replication in Prokaryotes01:32

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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
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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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The Replisome03:01

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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.
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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The DNA Replication Fork01:02

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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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Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
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独特的RPA功能促进了真核细胞DNA复制的启动和延长.

Alexandra M Pike1, Caitlin M Friend2, Stephen P Bell1

  • 1Howard Hughes Medical Institute, Massachusetts Institute of Technology, Department of Biology, Cambridge, MA 02139, USA.

Nucleic acids research
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PubMed
概括
此摘要是机器生成的。

复制蛋白A (RPA) 对于DNA复制和修复至关重要. 特定的DNA结合性质,而不是相互作用域,是原始解的关键,而RPA域独特地调节复制分叉功能.

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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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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:

  • 复制蛋白A (RPA) 对于真核细胞DNA复制,DNA损伤反应和修复至关重要.
  • RPA与单链DNA (ssDNA) 结合,并在原始解和DNA合成中发挥作用.

研究的目的:

  • 为了研究RPA在DNA复制过程中的功能要求.
  • 确定来自其他生物体的ssDNA结合蛋白 (SSB) 是否可以替代RPA.
  • 阐明RPA域在原始解卷和复制分叉进展中的特定作用.

主要方法:

  • 复制的Saccharomyces cerevisiae原产地解和DNA复制试验.
  • 测试各种ssDNA结合蛋白质,包括大肠杆菌SSB和T4菌体Gp32.2.
  • 对RPA突变的分析,以评估ssDNA结合和蛋白相互作用域的重要性.

主要成果:

  • 大肠杆菌SSB,但不包括T4 Gp32,在原产地完全取代了RPA.
  • RPA的特定ssDNA结合特性对于原始解至关重要,而蛋白质相互作用域对于这个过程是不可或缺的.
  • Rfa1 OB-F 域负面调节滞后链合成,而 Rfa2 翼螺旋域刺激新生的链启动.

结论:

  • 为了过渡到广泛的原始DNA解,需要特定的ssDNA结合模式.
  • 不同的RPA域在真核复制分叉上具有专门的功能,影响着启动和延长.
  • 了解RPA的多方面的作用,可以了解DNA复制和修复机制.