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S-Cdk Initiates DNA Replication02:38

S-Cdk Initiates DNA Replication

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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...
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Replication in Eukaryotes01:29

Replication in Eukaryotes

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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
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Replication in Eukaryotes02:31

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Overview
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The DNA Replication Fork01:02

The DNA Replication Fork

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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 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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Visualization of DNA Replication in the Vertebrate Model System DT40 using the DNA Fiber Technique
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Visualization of DNA Replication in the Vertebrate Model System DT40 using the DNA Fiber Technique

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細胞のDNA複製を開始するメカニズム

Franziska Bleichert1, Michael R Botchan2, James M Berger1

  • 1Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. franziska.bleichert@fmi.ch mbotchan@berkeley.edu jmberger@jhmi.edu.

Science (New York, N.Y.)
|February 18, 2017
PubMed
まとめ
この要約は機械生成です。

DNAの複製は,イニシアターとローダータンパク質によってロードされるヘリコースに依存する. この研究は,これらのタンパク質がヘリコースを貯蔵し,DNAを生命体全体で解き放つ方法を比較しています.

さらに関連する動画

Single-Molecule Real-Time Visualization of DNA Unwinding by CMG Helicase
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Single-Molecule Real-Time Visualization of DNA Unwinding by CMG Helicase

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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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関連する実験動画

Last Updated: Mar 7, 2026

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Single-Molecule Real-Time Visualization of DNA Unwinding by CMG Helicase
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Single-Molecule Real-Time Visualization of DNA Unwinding by CMG Helicase

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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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Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method

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科学分野:

  • 分子生物学
  • 遺伝学
  • 生物化学

背景:

  • 細胞のDNA複製には DNAヘリクスを解き放つために 環状のヘクサメリックヘリカスが必要です
  • 複製ヒレキースは,複製開始時にイニシアター,ローダー,および付属タンパク質によってDNAにロードされます.
  • このプロセスは厳格に規制され,複数のステップが含まれています.

研究 の 目的:

  • 生命の3つの領域にわたる DNA複製の始まりの 分子編曲について議論します
  • ヘリコースの堆積とDNAの解き放つ戦略の類似点と違いを強調する.
  • イニシアターとローダータンパク質の 進化的分岐を理解するために

主な方法:

  • DNA複製開始メカニズムの比較分析
  • タンパク質の相互作用と分子振動の見直し
  • イニシアタータンパク質とローダータンパク質の遺伝子比較.

主要な成果:

  • バクテリア,アルカイア,ユカリオットのヘリコースの堆積とDNAの解き放たれ戦略には類似点と違いがある.
  • イニシアタータンパク質とローダータンパク質は,遺伝的関連性にもかかわらず,そのメカニズムに相当かつ予測不可能な差異を示している.
  • DNA複製の開始の調節は保存されているが,機械的に多様である.

結論:

  • DNA複製の基本的プロセスは 生涯にわたって保たれています
  • 進化はヘリケースの負荷とDNAの解き放たれのための多様な分子機構をもたらした.
  • これらの異なる戦略を理解することで,DNA複製機構の進化の洞察が得られます.