関連する実験動画
Updated: Jun 20, 2026

10:58
Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules
Published on: July 25, 2013
タンパク質-リガンド結合-親和性予測におけるリガンド再構成自由エネルギーの重要性
Chao-Yie Yang1, Haiying Sun, Jianyong Chen
1Department of Internal Medicine, University of Michigan, 1500 East Medical Center Drive, Ann Arbor, Michigan 48109, USA.
Journal of the American Chemical Society
|September 10, 2009
まとめ
小分子結合親和性を予測することは,薬剤設計において極めて重要です. リガンドの再編成の自由エネルギーを含めて,XIAPタンパク質に結合するSmacミミティックの計算予測を大幅に改善しました.
科学分野:
- 計算化学はコンピュータ化学である.
- 構造生物学 構造生物学とは
- ドラッグ・ディスカバリー・ドラッグ・ディスカバリー
背景:
- 生物学的標的に対する小分子リガンド結合親和性の正確な予測は,構造ベースの薬剤設計に不可欠です.
- 現在の計算方法では,これらの結合親和性を信頼性のある方法で予測することが困難になり,薬の開発を阻害しています.
- 小分子Smac (カスパースの第2次ミトコンドリア誘発活性化剤) 模倣剤は,XIAP (X-結合アポトーシス阻害剤) タンパク質を標的にし,治療上の関心があります.
研究 の 目的:
- 31個の小分子SmacがXIAPタンパク質を模倣する結合モデルとアフィニティを計算的に予測する.
- 結合アフィニティ予測のためのドッキングとMM-GBSAを含む様々な計算方法のパフォーマンスを評価する.
- リガンド再編の自由エネルギーが結合親近性予測の精度に与える影響を調査する.
主な方法:
- コンピューティング・ドッキングは,31のSmacミミティクスとXIAP.のバインディングモデルを予測するために使用されました.
- 結合親和性は,経験的スコア,知識ベースのスコア関数,MM-GBSA.を使用して計算されました.
- アンサンブルタンパク質-リガンド構成を生成するために,分子動力学シミュレーションが採用されました.
- MM-GBSAの計算は,リガンド再編の自由エネルギーを含むように修正されました.
主要な成果:
- コンピューティング・ドッキングは,結束モデルを正確に予測し,実験的な結晶構造によって検証した.
- 標準的な計算方法では,結合親和度 (r(2) の予測が0.21から0.36の間で貧弱から控えめであることが示されました.
- MM-GBSAにおけるリガンド再編成自由エネルギーを含むと,結合親近性の予測が著しく改善されました (r(2) 0.36から0.66に増加しました).
- 改善された予測は,さらに10個のSmac模倣体で検証されました.
結論:
- リガンド再構成自由エネルギーは,タンパク質-リガンド結合自由エネルギーを正確に予測する上で重要な要因です.
- リガンドの再編成自由エネルギーの計算方法への含有は,薬剤設計の重要な進歩を提供します.
- この研究は,他のリガンド-タンパク質システムのリガンド再構成自由エネルギーの評価と新しいスコア機能の開発の重要性を強調しています.
関連する概念動画
Ligand Binding Sites
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Ligand Binding Sites
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
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...
The Equilibrium Binding Constant and Binding Strength
The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
The Equilibrium Binding Constant and Binding Strength
The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
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...
