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Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Covalent Binding of BMP-2 on Surfaces Using a Self-assembled Monolayer Approach
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塑造抗疟疾药物:PfCLK3共价抑制剂的几何第一方法

Skye B Brettell1, Carla Fuentes-Guerra Bustos1, Saumya Sharma2

  • 1School of Chemistry, The Advanced Research Centre, University of Glasgow, 11 Chapel Lane, Glasgow G11 6EW, U.K.

Journal of medicinal chemistry
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概括
此摘要是机器生成的。

由于Plasmodium falciparum耐药性的增加,开发新的抗疟疾药物至关重要. 这项研究通过专注于几何学来优化共价激酶抑制剂,从而产生了一种具有稳定性改进的有力新化合物.

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科学领域:

  • 药用化学 医学化学
  • 寄生虫学的寄生虫学
  • 药物发现 药物发现 药物发现

背景情况:

  • 在Plasmodium falciparum中抗疟疾药物耐药性需要新的治疗策略.
  • 疟原虫Clk3 (PfCLK3) 是一种被验证的抗疟疾药物开发目标.
  • 性激酶抑制剂 (CKIs) 提供持久的抑制,但通常优先考虑弹头反应性而不是最佳几何形状.

研究的目的:

  • 使用几何第一方法开发优化pfclk3的共价抑制剂.
  • 调查弹头和链接器几何学对与PfCLK3.3的共价键形成的影响.
  • 确定具有强大的抗疟疾活性和有利的类似药物的新型CKI候选药物.

主要方法:

  • 基于乙胺的共价抑制剂支架的系统结构修改.
  • 评估与PfCLK3 Cys368残留物的共价接触.
  • 优化化合物的抗寄生虫活性和代谢稳定性的评估.

主要成果:

  • 一种以几何为先的方法成功优化了共价pfclk3抑制剂.
  • 保持α-反应性几何学允许与较少反应性的电友进行共价接触.
  • 甲基硫酸盐类似物SB5-171表现出强大的抗疟活性 (EC50 = 104nM) 和增强的代谢稳定性 (t1/2 = 35分钟).

结论:

  • 几何优化是设计有选择性和有效的共价激酶抑制剂的可行策略.
  • 这种方法将共价参与与高内在反应性分离,从而改善了类似药物的特性.
  • 开发的化合物为未来的抗疟疾CKI药物发现提供了合理的框架.