関連する実験動画
Updated: Aug 9, 2026

11:40
Preparation of the Mgm101 Recombination Protein by MBP-based Tagging Strategy
Published on: June 25, 2013
酵母Rad52による酵母Rad51媒介再結合のRad52による刺激
1Department of Biology, Graduate School of Science, Osaka University, Toyonaka, Japan. ashino@bio.sci.osaka-u.ac.jp
Nature
|February 5, 1998
まとめ
Rad52タンパク質は,Rad51媒介のDNA再結合と修復を刺激する. Rad52とRad51の結合は,この刺激に不可欠であり,普遍的な真核生物再結合機構のための重要な核タンパク質フィラメント形成を促進します.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- バイオケミストリー バイオケミストリー
背景:
- RAD51およびRAD52遺伝子は,Saccharomyces cerevisiaeのDNA再結合と修復に不可欠である.
- RAD51はrecAの同型であり,核タンパク質フィラメント経由で鎖交換とATPの水解に関与する.
- RAD52はRAD51媒介による再結合において重要な役割を果たし,エウカリオット全体でホモログが保存されています.
研究 の 目的:
- DNA再結合におけるRad51とRad52タンパク質の機能的関係を調査する.
- Rad52の再結合に対する刺激効果のために,Rad51へのRad52結合が必要かどうかを判断する.
主な方法:
- タンパク質とタンパク質の相互作用と酵素の作用を研究するための生化学的測定法.
- Rad51核タンパク質のフィラメント形成の分析は,Rad52.2の存在と欠如において行われます.
主要な成果:
- Rad52タンパク質は,Rad51媒介反応を刺激することが示されました.
- Rad52のRad51に対する刺激効果は,Rad52とRad51の直接結合に依存していた.
- 結合は,Rad51核タンパク質のフィラメント形成を促進するために不可欠です.
結論:
- Rad52タンパク質は,DNA再結合におけるRad51の活性を直接刺激する.
- Rad51とRad52の相互作用は,効率的な同類DNAのペアリングと再結合に不可欠である.
- これらの発見は,真核生物のDNA修復と再結合の保存されたメカニズムを強調しています.
関連する概念動画
Fixing Double-strand Breaks
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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...
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...
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...
Conservative Site-specific Recombination and Phase Variation
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
Crossing Over
Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...

