相关实验视频
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Use of Microscale Thermophoresis to Measure Protein-Lipid Interactions
Published on: February 10, 2022
蛋白质-配体相互作用:热力学效应与增加非极地表面积相关
James M Myslinski1, John E DeLorbe, John H Clements
1Chemistry and Biochemistry Department, Institute of Cellular and Molecular Biology, The University of Texas, Austin, Texas 78712, USA.
Journal of the American Chemical Society
|October 20, 2011
概括
这是一个 Grb2 SH2 域.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 分子相互作用 分子相互作用
背景情况:
- Grb2蛋白在细胞信号通路中起着至关重要的作用.
- 了解其SH2域的结合相互作用是破译信号传导的关键.
- 环酸氨基酸为调节蛋白质-连接体相互作用提供独特的结构性质.
研究的目的:
- 用新型三来研究 Grb2 SH2 域复合体形成的热力学参数.
- 探讨不同环状氨基酸环大小对结合亲和力的影响.
- 将结构发现与热力学数据相对应,以了解蛋白质-联结体能量学.
主要方法:
- 热力学分析 (例如,异热定位热量计) 来确定约束参数.
- 结晶学分析以阐明相互作用的结构基础.
- 合成Ac-pTyr-Xaa-Asn三,具有多种周期性氨基酸环大小的三.
主要成果:
- 结合亲和度随着循环合环大小 (3至6个成员) 的增加,这是由于有利的度.
- 凝聚力驱动的疏水效应占主导地位,而不是热效应.
- 结构分析显示,范德瓦尔斯接触增加,并埋藏了带有较大的环的非极地表面积.
- 结合和热容量变化 (ΔC(p)) 之间没有发现直接相关性.
结论:
- 蛋白质 - 连接体相互作用并不总是由简单的性贡献来支配.
- 疏水效应在能驱动的结合中起着重要作用.
- 结构洞察力揭示了非极地表面积在结合自由能量的重要性.
- 这些发现挑战了常见的假设,并为未来的连接体设计策略提供了信息.
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...
Noncovalent Attractions in Biomolecules
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules
Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
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:

