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関連する概念動画

Proofreading01:43

Proofreading

Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA strand. DNA polymerase has a higher affinity for the correct base to ensure fidelity in DNA replication. The DNA polymerase furthermore proofreads during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.Errors during Replication Are Corrected by the DNA Polymerase EnzymeGenomic DNA is synthesized in...
Mismatch Repair01:36

Mismatch Repair

Overview
Mismatch Repair01:36

Mismatch Repair

Overview
Translesion DNA Polymerases02:10

Translesion DNA Polymerases

Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
Proofreading01:31

Proofreading

Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase Enzyme
Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...

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関連する実験動画

Updated: Jul 12, 2026

Direct Observation of Enzymes Replicating DNA Using a Single-molecule DNA Stretching Assay
17:03

Direct Observation of Enzymes Replicating DNA Using a Single-molecule DNA Stretching Assay

Published on: March 23, 2010

DNAポリメラーゼで観察された不一致複製エラーの構造

Sean J Johnson1, Lorena S Beese

  • 1Department of Biochemistry, Duke University Medical Center, Durham, NC 27710, USA.

Cell
|March 24, 2004
PubMed
まとめ

高精度DNAポリメラーゼは,不一致の塩基対に出くわしたときに停止することによって,ゲノムの安定性を確保します. この研究は,この停止の構造的メカニズムを明らかにし,酵素のエラーの"短期記憶"を説明します.

科学分野:

  • 分子生物学は分子生物学である.
  • バイオケミストリー バイオケミストリー
  • 遺伝学 遺伝学とは

背景:

  • 精密なDNA複製は,ゲノムの安定性を維持するために不可欠です.
  • DNAポリメラーゼは,複製の誤りを修正するために,スタリングのようなメカニズムを採用します.
  • いくつかのポリメラーゼは,a を示す.
  • 短期記憶とは,短期記憶のことです.
  • プライマーの終点から遠く離れた不一致の例です.

研究 の 目的:

  • DNAポリメラーゼ活性部位における12の可能な塩基対不一致を構造的に特徴づけること.
  • DNA不一致によって誘発されるポリメラーゼの停滞のメカニズムを解明する.
  • 遠隔の不一致が酵素によってどの程度認識されるかを調べるために.

主な方法:

  • DNAポリメラーゼ-不一致複合体を捕捉するためのX線結晶学.
  • 12種類の異なる不一致の構造分析.
  • プライマー末端から最大6塩基対に及ぶDNA構造の検査.

主要な成果:

  • 不一致によって引き起こされるポリメラーゼの停滞の4つの異なるメカニズムを特定しました.

さらに関連する動画

Proofreading and DNA Repair Assay Using Single Nucleotide Extension and MALDI-TOF Mass Spectrometry Analysis
11:08

Proofreading and DNA Repair Assay Using Single Nucleotide Extension and MALDI-TOF Mass Spectrometry Analysis

Published on: June 19, 2018

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
05:37

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Published on: April 4, 2025

関連する実験動画

Last Updated: Jul 12, 2026

Direct Observation of Enzymes Replicating DNA Using a Single-molecule DNA Stretching Assay
17:03

Direct Observation of Enzymes Replicating DNA Using a Single-molecule DNA Stretching Assay

Published on: March 23, 2010

Proofreading and DNA Repair Assay Using Single Nucleotide Extension and MALDI-TOF Mass Spectrometry Analysis
11:08

Proofreading and DNA Repair Assay Using Single Nucleotide Extension and MALDI-TOF Mass Spectrometry Analysis

Published on: June 19, 2018

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
05:37

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Published on: April 4, 2025

  • DNAの歪みが不一致情報を活性部位に伝達することを観察した.
  • 不一致に対するポリメラーゼ反応は,プライマーの終端から最大6つの塩基対まで拡張できることを実証しました.

    • 結論:

    • DNAポリメラーゼのフィデリティメカニズムに関する構造的洞察.
    • 橋の構造的基盤の解明
    • 短期記憶とは,短期記憶のことです.
    • 複製の誤りについてです.
    • DNAポリメラーゼがエラー認識とスタリングを通じてゲノム整合性を維持する方法を理解する.