DNAのエンドツーエンド結合の新たな経路
S Thode1, A Schäfer, P Pfeiffer
1Institute of Genetics, University of Cologne, Federal Republic of Germany.
Cell
|March 23, 1990
まとめ
違法な再結合により,DNAの末端が結合する. 新種のタンパク質は,DNA修復合成と結合のために突起する単一鎖 (PSS) を正確に整列し,正確なDNA末端結合を保証します.
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:
- 違法な再結合は,非同類DNAの末端に結合することができる.
- 突出する単一鎖 (PSS) は,このような反応における一般的なDNA末端である.
研究 の 目的:
- 3'突起の単一鎖 (PSS) のDNA末端の修復機構を調査する.
- クセノプスの卵抽出物におけるPSS terminiを含むDNA末端結合のプロセスを解明する.
主な方法:
- クセノプスの卵抽出物におけるDNA結合反応の分析.
- PSS terminiでのDNA合成と結合のステップの特徴.
主要な成果:
- 3' PSSの末端は,埋め込みDNA合成によって保存されます.
- 合成のためのプライミングは,結合前に発生し,特定のリガゼを必要としません.
- DNA端末の正確な配列は,プライミングに不可欠です.
結論:
- 独特のDNA結合タンパク質を含む新しいメカニズムにより,DNA末端の正確な配列が容易になります.
- このアライメントメカニズムは,PSS端末のDNA修復合成と結合に不可欠です.
さらに関連する動画
06:59Using Next Generation Sequencing to Identify Mutations Associated with Repair of a CAS9-induced Double Strand Break Near the CD4 Promoter
Published on: March 31, 2022
07:55Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
Published on: September 11, 2022
関連する概念動画
01:02Long-patch Base Excision Repair
Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
02:04Fixing 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...
02:31Homologous 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...
02:27Base-pairing and DNA Repair
Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
02:04Fixing 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...
02:31Homologous 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...