関連する実験動画
Updated: Jul 8, 2026

16:24
Analyzing and Building Nucleic Acid Structures with 3DNA
Published on: April 26, 2013
高級タンパク質-DNA複合体のマッピング:ラムダアットLLLにおける2種類の長距離相互作用
S Kim1, L Moitoso de Vargas, S E Nunes-Düby
1Division of Biology and Medicine, Brown University, Providence, Rhode Island 02912.
Cell
|November 16, 1990
まとめ
バクテリオファージ・ラムダ Intタンパク質とIHFタンパク質の相互作用は,サイト固有の再結合の鍵です. モデルでは,Intタンパク質がDNAと結合し,IHFと相互作用し,DNAの曲折と再結合のための複合体の形成を促進することを示しています.
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:
- サイト固有の再結合は,ウイルスDNAの統合と切除に不可欠です.
- ラムダファグの再結合の分子メカニズムを理解することは,遺伝子工学と治療にとって不可欠です.
研究 の 目的:
- ラムダサイト固有の再結合におけるタンパク質-タンパク質およびタンパク質-DNAの相互作用を解明する.
- Int タンパク質,IHF タンパク質,attL DNA の間で形成される複合体のモデルを開発する.
主な方法:
- 自殺基板を用いた腸裂け検査.
- 核の保護パターン分析.
- ゲル遅延実験 ゲル遅延実験
- 定量的なウェスタン・ブロッティング.
主要な成果:
- 1つの統合宿主因子 (IHF) 分子がattL DNAを曲げるモデルが提案されました.
- 3つの二価Intタンパク質は,絶縁性再結合のために必要であり,IHFとより高い階層の複合体を形成します.
- 各Intタンパク質は,独特の結合モードを示す:シスブリッジ,高親和度N端DNA結合,および低親和度C端DNA結合は,タンパク質とタンパク質の相互作用に依存する.
結論:
- 提案されたモデルは,Int,IHF,attL DNAの複雑な相互作用を詳細に説明しています.
- 複合体は,異なるDNA結合ドメインを通じて,再結合パートナーとの特定の相互作用を促進します.
関連する概念動画
Protein Organization
Overview
Protein-protein Interfaces
Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
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 Networks
An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
These interactions can be represented through maps depicting protein-protein interaction networks, represented as nodes and edges. Nodes are circles that are representative of a protein,...
The Replisome
DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...
Protein Organization
Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
The primary structure of a protein is its amino acid sequence.

