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相关概念视频

Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

761
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
761
Formation of Complex Ions03:45

Formation of Complex Ions

25.5K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
25.5K
Complexation Equilibria: Overview01:23

Complexation Equilibria: Overview

1.3K
Complexation reactions take place when dative or coordinate covalent bonds form between metal ions and ligands. The compounds formed in these reactions are called coordination compounds. The number of bonds formed between the metal ion and the ligands is called its coordination number. Generally, most metal ions in an aqueous solution are solvated by water molecules and thus exist as aqua complexes.
The equilibrium constant of the complexation reaction is represented as the formation constant...
1.3K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.2K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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相关实验视频

Updated: Jan 7, 2026

Author Spotlight: Evaluating Biophysical Assays for Characterizing PROTACS Ternary Complexes
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一个SMARCA2 PROTAC和循环德克斯特林的形状依赖复合相互作用.

Matthew N O'Brien Laramy1, José G Napolitano1, Yuhui Zhou2

  • 1Synthetic Molecule Pharmaceutical Sciences, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States.

Molecular pharmaceutics
|December 20, 2025
PubMed
概括
此摘要是机器生成的。

蛋白质降解剂,或蛋白质分解向化马体 (PROTACs),表现出独特的结构性质,影响其溶解性. 了解这些PROTAC构造是有效配方和药物开发的关键.

关键词:
这就是 PROTACs.这就是SMARCA2的标志.形状的变化 形状的变化循环德克斯特林 (Cyclodextrin) 是一种循环德克斯特林.蛋白质降解剂 蛋白质降解剂溶解度 溶解度 溶解度 溶解度有针对性的蛋白质降解降解.

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科学领域:

  • 生物化学 生物化学
  • 药用化学 医学化学
  • 制药科学 制药科学

背景情况:

  • 双对应蛋白质降解剂,称为蛋白质分解向嵌合体 (PROTACs),代表了一种新的治疗方法.
  • PROTACs具有独特的物理化学和结构特征,可以阻碍生物制药性质,如溶解度,使药物开发复杂化.
  • 关于专门为PROTACs量身定制的制定策略的研究有限,以应对这些挑战.

研究的目的:

  • 为了研究基于VHL的PROTAC (A515) 针对SMARCA2.2的溶解机制.
  • 阐明分子构成和立体化学在PROTAC溶解性和配方中的作用.

主要方法:

  • 使用了核磁共振 (NMR) 光谱技术.
  • 使用的是异热定位热量计 (ITC).
  • 进行了定量溶解度测量.

主要成果:

  • 在水溶液中,A515存在于两个不同的形状群体中,不同的胺组旋转 (跨-烯和 cis-烯异构体).
  • 跨-烯异构体采用具有较大的水力动力学尺寸的开放构造,而 cis-烯异构体则形成具有较小水力动力学尺寸的凝结构造.
  • 在这些种群中,2-基-β-环氧 (HP-β-CD) 的溶解效率因A515末端区域的可访问性而有所不同.

结论:

  • 形态和立体化学在PROTACs的合理配方设计中发挥着至关重要的,以前没有报告的作用.
  • 不同的PROTACs构造群体对HP-β-CD等溶解辅助剂的反应有所不同.
  • 这些发现为制定基于VHL的PROTAC提供了具体考虑,以提高溶解度.