関連する実験動画
Updated: Aug 12, 2026

16:24
Analyzing and Building Nucleic Acid Structures with 3DNA
Published on: April 26, 2013
特定および非特定複合体におけるCroタンパク質によるDNA曲解:タンパク質の部位認識と特異性への影響
D A Erie1, G Yang, H C Schultz
1Institute of Molecular Biology, University of Oregon, Eugene 97403.
まとめ
スキャニングフォース顕微鏡では,ラムダ・クロタンパク質が特定のDNA部位と非特定のDNA部位の両方を曲げることを明らかにしました. このDNA曲線はタンパク質結合特異性を高め,DNA結合タンパク質の一般的なメカニズムである可能性があります.
科学分野:
- 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
- 構造生物学 構造生物学とは
背景:
- ラムダ・クロタンパク質は,オペレータ部位に結合することによって,遺伝子発現を調節する.
- DNA結合タンパク質は,結合時にDNAの構成変化を誘導することが多い.
- DNAの曲解を理解することは,タンパク質とDNAの相互作用を解読する上で極めて重要です.
研究 の 目的:
- ラムダ・クロタンパク質結合によって誘発されるDNAの曲解を調査するために.
- 特定のおよび非特定のDNAサイトにおける曲折角を定量化するために.
- タンパク質-DNA認識におけるDNA曲線の機能的影響を調査する.
主な方法:
- タンパク質-DNA複合体を視覚化するためにスキャニングフォース顕微鏡を用いた.
- オペレーターサイトに結合したラムダ・クロタンパク質の3次元構造を分析した.
- 高解像度画像技術を使用してDNAの曲折角度を測定しました.
主要な成果:
- Lambda Croタンパク質は,単一または複数の二重体として,オペレーターサイトで解消されました.
- 特定のDNA部位は,Cro結合時に69°±11°の曲角を示した.
- 非特異的なDNA部位は62°±23°の曲角を示した.
結論:
- クロタンパク質は,特定の結合部位と非特定の結合部位の両方で DNA の重要な曲解を誘導する.
- 非特異的な部位の曲折は,Croの結合特異性を高め,標的配列の認識を容易にする可能性があります.
- 非特定の部位のDNA曲折は,特定の標的を曲げるDNA結合タンパク質の共通の特徴である可能性があります.
関連する概念動画
Conserved Binding Sites
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 analyses the...
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 analyses the...
Ligand Binding and Linkage
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 the...
Protein Complexes with Interchangeable Parts
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
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...
Single-Strand DNA Binding Proteins
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...
Conserved Binding Sites
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 analyses the...
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 analyses the...

