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Factors Affecting Protein-Drug Binding: Protein-Related Factors01:20

Factors Affecting Protein-Drug Binding: Protein-Related Factors

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Drug binding to proteins is a key aspect of pharmacokinetics and can influence a drug's distribution, absorption, and elimination in the body. Several factors, including the drug's physiochemical properties, protein concentration, disease states, and the number of binding sites on the protein, influence this process.
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Drug binding to proteins is a complex phenomenon influenced by various drug-related factors, each playing a significant role in the interaction between drugs and proteins within the body.
One crucial factor in drug-protein binding is the drug's lipophilicity or its affinity for fat. More lipophilic drugs tend to have higher binding extents. For example, highly lipophilic drugs like cloxacillin exhibit substantial protein binding, with as much as 95% of the drug binding to proteins. In...
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Factors Affecting Protein-Drug Binding: Drug Interactions01:23

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Drug interactions are a critical aspect of pharmacology and can occur when two or more drugs compete for the same binding site. This competition can result in one drug displacing another, altering the effect of the displaced drug. Drug interactions are complex processes that rely heavily on how much of the displacer drug is present and how strongly it can bind to the same sites as the displaced drug.
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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...
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Protein-drug binding refers to the interaction between drugs and proteins within the body. This binding process can occur intracellularly, involving drug interactions with enzymes or receptors within cells, or extracellularly, involving plasma proteins in the blood.
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Drugs predominantly attach to plasma proteins, with only a small percentage remaining unbound. The unbound portion can be calculated as one minus the bound fraction. Acidic drugs form large, inactive complexes by reversibly binding to plasma albumin, which prevents them from diffusing across biological barriers. These drug-protein complexes act as reservoirs for the drugs. As the concentration of unbound drugs decreases, these complexes quickly dissociate to release the free drug, maintaining...
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广泛的PFAS与脂肪酸结合蛋白4的结合是通过可变的结合方式实现的.

Aaron S Birchfield1, Faik N Musayev2,3, Abdul J Castillo1

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人类脂肪细胞脂肪酸结合蛋白 (FABP4) 结合了各种和多基物质 (PFAS),包括遗留化学品的替代品. 结构分析揭示了不同的结合模式,影响毒理学结果和代谢调节.

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科学领域:

  • 环境化学环境化学
  • 结构生物学 结构生物学
  • 毒理学 毒理学 毒理学

背景情况:

  • 和多基基物质 (PFAS) 是已知的广泛存在的环境污染物.
  • PFAS与生物蛋白的相互作用背后的分子机制尚不清楚.
  • 人体脂肪细胞脂肪酸结合蛋白 (FABP4) 在代谢调节和内分泌功能中起作用.

研究的目的:

  • 研究FABP4与多种PFAS之间的结合相互作用.
  • 阐明PFAS-FABP4复合体形成的结构基础.
  • 了解PFAS与FABP4结合如何影响新陈代谢过程和疾病风险.

主要方法:

  • 光竞争试验用于测量结合亲和力.
  • 进行X射线晶体学以确定FABP4与特定PFAS (PFOA,PFDA,PFHxDA) 复合的结构.
  • 结合模式的分析及其与化学性质的相关性.

主要成果:

  • FABP4结合了各种PFAS,包括新的替代物和长链化合物.
  • 短链PFAS对FABP4具有可测量的结合亲和力,超过非化类型的PFAS.
  • 晶体结构显示了PFOA,PFDA和PFHxDA的三个不同的结合模式,PFOA在两个位点结合.
  • 结合模式涉及增强的疏水相互作用和独特的蛋白质构造,解释观察到的亲缘关系.

结论:

  • PFAS-FABP4相互作用受到PFAS链长,头组和蛋白质构成的影响.
  • 结合FABP4的PFAS,即使在低亲和度,也可能由于FABP4在内分泌功能中的作用扰乱代谢调节.
  • 结构和生化洞察力对于理解PFAS运输和毒理影响至关重要.