関連する実験動画
Updated: May 16, 2026

07:55
Visualization of DNA Repair Proteins Interaction by Immunofluorescence
Published on: June 26, 2020
DNA修復の支架は,Rad9アダプターに対抗することによって,チェックポイントのシグナリングを阻害します
Patrice Y Ohouo1, Francisco M Bastos de Oliveira, Yi Liu
1Department of Molecular Biology and Genetics, Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, New York 14853, USA.
Nature
|November 20, 2012
まとめ
DNA修復タンパク質Slx4とRtt107は,複製ストレス中にDNA損傷チェックポイント (DDC) の過剰活性化を防止します. この調節は,Rad53キナーゼ活性を調節することによって,ゲノム安定性を維持します.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
背景:
- DNAダメージチェックポイント (DDC) 経路は,遺伝子毒性ストレスへの反応として細胞サイクル進行を一時的に停止することによって,ゲノム維持に不可欠です.
- 制御不能なDDC信号は,有害な細胞サイクル停止を引き起こし,正確な制御メカニズムの必要性を強調します.
- DDCシグナリングがどのように監視され,調節されるかを理解することは,ゲノム安定性を理解するために不可欠です.
研究 の 目的:
- 複製のストレス中にDDCシグナル伝達を調節するSlx4とRtt107のDNA修復スキャフォールディングタンパク質の役割を調査する.
- Slx4とRtt107が異常なDDC過活性化を防ぐメカニズムを解明する.
- DDCキナーゼ活性調節に関与する主要なタンパク質相互作用と経路を特定する.
主な方法:
- Saccharomyces cerevisiaeをモデル生物として利用した.
- 野生型および変異株 (Slx4,Rtt107欠乏) のキナーゼMec1およびRad53の活性化を分析することによって,DDCシグナル伝達を調査した.
- 生物化学的および遺伝的アプローチを用いて,Slx4,Rtt107,Rad9,Dpb11,およびリン酸化ヒストンH2Aのタンパク質とタンパク質の相互作用を調べました.
主要な成果:
- Slx4またはRtt107が欠けている細胞は,複製ストレスで下流DDCキナーゼRad53の過活性化を示すが,上流キナーゼMec1の活性化は正常である.
- Slx4-Rtt107複合体は,Dpb11とリン酸化ヒストンH2Aと物理的に相互作用し,チェックポイントアダプタRad9.9を抵消する.
- RAD53とH2Aの低形変異は,DDCシグナル伝達を低下させ,Slx4またはRtt107欠陥細胞で観察された複製ストレス過敏性を救済する.
結論:
- Slx4-Rtt107複合体は,複製ストレス中のDDC過活性化を防止する上で重要な役割を果たします.
- この調節は,Rad9,Dpb11,ヒストンH2Aを含むコンペティションベースのメカニズムを通じて発生し,複製病変におけるRad9の関与をバランスをとります.
- DNA修復因子は,DDCシグナリングを直接監視し,調節し,ゲノム維持経路に関する新しい洞察を提供します.
関連する概念動画
DNA Damage can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
DNA Damage Can Stall the Cell Cycle
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
Restarting Stalled Replication Forks
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, a...
Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
The Spindle Assembly Checkpoint
The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Negative Regulator Molecules
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
