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相关概念视频

Ionic Crystal Structures02:42

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Free energy—abbreviated as G for the scientist Gibbs who discovered it—is a measurement of useful energy that can be extracted from a reaction to do work. It is the energy in a chemical reaction that is available after entropy is accounted for. Reactions that take in energy are considered endergonic and reactions that release energy are exergonic. Plants carry out endergonic reactions by taking in sunlight and carbon dioxide to produce glucose and oxygen. Animals, in turn, break...
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Crystallizing Membrane Proteins for Structure Determination using Lipidic Mesophases
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博尔茨-ABFE:没有晶体结构的自由能量扰动.

Stephan Thaler1,2, Zhiyi Wu2, William G Glass2

  • 1Valence Laboratories, 6666 Rue Saint-Urbain 100, Montréal QC H2S 3H1, Canada.

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概括
此摘要是机器生成的。

自由能量扰动 (FEP) 模拟现在可以在没有实验结构的情况下估计结合亲和力. 新的Boltz-ABFE管道使用预测的蛋白质-连接体复合体来更快地发现药物.

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科学领域:

  • 计算化学是一种计算化学.
  • 药物发现 药物发现
  • 结构生物学是结构生物学.

背景情况:

  • 自由能量扰动 (FEP) 是绑定亲和度估计的黄金标准.
  • FEP的准确性依赖于精确的蛋白质-连接体复杂结构,在药物发现的早期通常无法通过实验获得.
  • 现有的方法受限于对实验性晶体结构的需求.

研究的目的:

  • 开发一个强大的管道 (博尔茨-ABFE) 绝对结合自由能量 (ABFE) 估计没有实验晶体结构.
  • 评估预测的蛋白质 - 连接体复合结构对FEP模拟的有用性.
  • 为了在早期药物发现中实现基于结构的亲和度估计.

主要方法:

  • 将博尔茨-2结构预测模型与绝对FEP协议集成.
  • 开发自动化方法来改进用于分子动力学模拟的预测结构.
  • 使用FEP+基准集中的四个蛋白质标验证了Boltz-ABFE管道.

主要成果:

  • 博尔茨-2成功地预测了适合FEP的蛋白质连接体复杂结构.
  • 自动化结构改进提高了模拟预测模型的质量.
  • 博尔茨-ABFE管道准确地估计了无实验结构的多个蛋白质标的ABFE.

结论:

  • 博尔茨-ABFE证明了使用预测结构执行FEP模拟的可行性.
  • 这种方法显著扩大了FEP在药物发现中的适用性.
  • 博尔茨-ABFE通过精确的基于结构的结合亲和度估计,加速早期药物发现.