ダプレックスDNAのアデニン残留と基礎部位の間のDNA-DNAクロスリンク形成
Nathan E Price1, Kevin M Johnson, Jin Wang
1Department of Chemistry and ‡Department of Biochemistry, University of Missouri , Columbia, Missouri 65211, United States.
Journal of the American Chemical Society
|February 11, 2014
まとめ
DNAの基底部 (Ap) 部位は,自発的に有害な鎖間クロスリンクを形成する可能性があります. 反対の鎖のAp位アルデヒドとアデニンの間のこの反応は,DNAで容易に起こります.
科学分野:
- 分子生物学は分子生物学である.
- DNAの損傷と修復について
- バイオケミストリー バイオケミストリー
背景:
- DNA核塩基の喪失は,循環性半アセタルとリング開かれたアルデヒドの混合物として存在するアバシック (Ap) サイトを作成します.
- Ap部位のアルデヒド群は電愛性であり,DNAの核愛性部位と反応することができる.
研究 の 目的:
- 基礎部 (Ap) 部位が対極鎖のDNAと共性添加体を形成する可能性を調査する.
- Ap.サイトから発生するDNA-DNAクロスリンクの形成と産出を特徴づける.
主な方法:
- 基礎 (Ap) 部位を含むDNA複合体の分析.
- 生理学的に重要な条件下でのアダクト形成の特徴.
主要な成果:
- Ap部位のアルデヒド群と反対のDNA鎖のアデニンのN(6) -アミノ群の間の共性アドクトの形成に関する証拠が報告されました.
- 特に5'-ApT/5'-AA配列で観察された,鎖間DNA-DNAクロスリンクの高収量 (15-70%) です.
- 反応は,生理学的に適切な条件下で起こります.
結論:
- アバシック (Ap) サイトは,DNAテンプレート反応を通じて,スポンタン的にDNA-DNAクロスリンクを生成することができます.
- この自然に発生するクロスリンクメカニズムは,生物の細胞における遺伝物質の完全性に影響を及ぼします.
関連する概念動画
Spontaneous and Induced Mutations
3.2K
Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
3.2K
Fixing Double-strand Breaks
12.1K
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...
12.1K
Fixing Double-strand Breaks
3.4K
3.4K
Homologous Recombination
58.8K
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...
58.8K
Single-Strand DNA Binding Proteins
12.9K
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
12.9K
Proofreading
52.0K
Overview
52.0K


