タンパク質結合部位から水分子の移動のエネルギー:リガンド最適化への影響
Julien Michel1, Julian Tirado-Rives, William L Jorgensen
1Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA.
Journal of the American Chemical Society
|September 26, 2009
まとめ
タンパク質に結合した水の置換による薬剤設計の修正は,リガンドの親和性を高めることができます. しかし,成功は水分除去と新しい相互作用の間のエネルギーバランスに依存し,正確な予測のために完全な熱力学分析が必要です.
科学分野:
- 計算化学はコンピュータ化学である.
- ドラッグ・ディスカバリー・ドラッグ・ディスカバリー
- バイオフィジックス 生物物理学
背景:
- 鉛分子の親和性を高めることは,重要な薬剤設計戦略です.
- タンパク質結合部位から秩序ある水分子を移動させることが,そのようなアプローチの1つです.
- 水位移動のエネルギー的な結果が常に予測できるわけではない.
研究 の 目的:
- タンパク質結合部位における秩序ある水分子の移動のエネルギー学を明確にするために.
- 類似した構造的改変が異なる親和の変化をもたらす理由を調査する.
- リード最適化のための正確な計算ガイドラインを提供するために.
主な方法:
- 自由エネルギーの乱れ計算.
- モンテカルロ統計力学シミュレーション.
- シタロン脱水酵素,p38-alphaMAPキナーゼ,EGFRキナーゼを標的とするリガンドシリーズの分析.
主要な成果:
- リガンド改変の親和の変化は,水分子移動の容易さと相関する.
- 水分除去エネルギーは新しい相互作用によって相殺されない場合,結合親和性は減少する可能性があります.
- 正確な予測には,水の位置を特定し,関連する自由エネルギーの変化を計算する必要があります.
結論:
- 完全な熱力学分析は,正確な薬剤設計変更のために不可欠です.
- 計算でリガンドを直接変更すると,誤った結果が得られます.
- 水分子のエネルギー学を理解することは,リードの最適化に成功するために不可欠です.
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...
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...
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:

