从蛋白质结合位点移除水分子的能量:对连接体优化的后果
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
概括
药物设计修改取代蛋白质结合的水可以增强连接体亲和力. 然而,成功取决于除水和新相互作用之间的能量平衡,需要完整的热力学分析来准确预测.
科学领域:
- 计算化学是一种计算化学.
- 药物发现 药物发现
- 生物物理学的生物物理.
背景情况:
- 提高分子 afinity 是一个关键的药物设计策略.
- 从蛋白质结合点中取代有序的水分子是一种这样的方法.
- 水位移的能量结果并不总是可以预测的.
研究的目的:
- 为了澄清蛋白质结合部位中有序水分子移位的能量.
- 研究为什么类似的结构修改会产生不同的亲和力变化.
- 为了提供准确的计算指导,以优化.
主要方法:
- 自由能量扰动计算.
- 蒙特卡洛统计力学模拟.
- 对带序列的分析,这些序列的向是赛他隆脱水酶,p38-alphaMAP激酶和EGFR激酶.
主要成果:
- 连接物修饰亲和力变化与水分子移位的容易度相关.
- 如果除水能量没有被新的相互作用抵消,结合亲和力可能会下降.
- 准确的预测需要确定水位,并计算相关的自由能量变化.
结论:
- 完整的热力学分析对于准确的药物设计修改至关重要.
- 在计算中直接修改连接物可以产生误导性的结果.
- 了解水分子的能量是成功优化的关键.
相关概念视频
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:

