関連する実験動画
Updated: Feb 18, 2026

11:27
Studying DNA Looping by Single-Molecule FRET
Published on: June 28, 2014
15.9K
動力学的にトラップされたリガンド結合がDNAタンデムで繰り返される
Rabia Tahir1, Shankar Pandey1, Jacob Haller1
1Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44240, United States.
Biochemistry
|February 17, 2026
まとめ
DNAのタンデムリピートに結合するリガンドは,安定した状態だけでなく,運動的に閉じ込められた状態につながる可能性があります. この画期的な発見は,ゲノム内の分子相互作用の新しいメカニズムを明らかにしています.
科学分野:
- ゲノミクスゲノミクスとは
- 分子生物学は分子生物学である.
- バイオフィジックス 生物物理学
背景:
- タンデムDNAの重複はヒトゲノムに多く存在し,遺伝子調節に影響を与えます.
- これらの繰り返しに対するリガンド結合の調査は,アンサンブル平均化により,NMRやX線結晶学のような伝統的な方法では困難である.
研究 の 目的:
- ネトロプシンとアデニン-チミン (A-T) の間の結合メカニズムを調査するために,単一分子技術を使用してDNAが繰り返されます.
- タンデム・リピート内のリガンド-DNA相互作用において,運動的にトラップされた状態の可能性を調査する.
主な方法:
- 高い感度と時間解像度を持つ単一分子技術である光学ピンチを使用しました.
- A-T DNAの繰り返しにおける個別の認識部位にDNAのマイナー・グリューブ・バインダーであるネットロプシンの結合を尋問した.
主要な成果:
- 熱力学的に安定した状態よりも,A-T DNAの繰り返しに結合するネトロプシンが運動的に閉じ込められた状態を好むことを発見しました.
- リガンドとDNAのタンデムリピート間の動力学的にトラップされた誤結合の最初の直接的な実証を提供した.
結論:
- DNAのタンデム・リピートに結合するリガンドは,分子相互作用における新しい発見である運動的に閉じ込められた状態を引き起こす可能性があります.
- このメカニズムは,生物学的システムにおける結合体受容体相互作用に根本的な役割を果たし,生物学的活動に影響を与える可能性があります.
さらに関連する動画
関連する概念動画
Cooperative Binding of Transcription Regulators
7.4K
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
7.4K
Single-Strand DNA Binding Proteins
16.8K
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...
16.8K
Conserved Binding Sites
5.2K
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
5.2K
Ligand Binding and Linkage
5.7K
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
5.7K
DNA Topoisomerases
36.1K
Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
Types and Mechanism of action
Topoisomerases are divided into two main types. ...
Types and Mechanism of action
Topoisomerases are divided into two main types. ...
36.1K
Translesion DNA Polymerases
11.3K
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...
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...
11.3K

