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相关概念视频

Drug Metabolism: Phase I Reactions01:17

Drug Metabolism: Phase I Reactions

A phase I reaction is a biochemical process that introduces a functionally reactive polar group to a substance. This transformation predominantly occurs in the liver, facilitated by the cytochrome P450 system of hemoproteins situated in the lipophilic endoplasmic reticulum of cells. The metabolite generated through this process can have varying polarities. If it is sufficiently polar, it can be easily excreted in the urine due to its water compatibility. However, if the metabolite is nonpolar,...
Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes01:28

Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes

Cytochrome P450 (CYP450) enzymes are a superfamily of heme-containing monooxygenases that play a pivotal role in Phase I drug metabolism by catalyzing oxidation and reduction reactions.These enzymes transform lipophilic xenobiotics into more hydrophilic metabolites, facilitating subsequent Phase II conjugation and eventual excretion. The CYP450 family is classified into families (e.g., CYP1–CYP3) and subfamilies (e.g., CYP2A, CYP2C), based on amino acid sequence homology.CYP450 isoenzymes,...
Drug Metabolism: Phase II Reactions01:14

Drug Metabolism: Phase II Reactions

Phase II reactions are essential for the detoxification and elimination of drugs from the body. These reactions involve the conjugation of parent drugs or their phase I metabolites with endogenous molecules, resulting in more hydrophilic drug conjugates. The primary conjugation reactions in this phase are sulfation and glucuronidation. Both sulfation and glucuronidation typically produce biologically inactive metabolites. However, in some cases involving prodrugs, active metabolites may be...
Bioactivation and Tissue Toxicity01:25

Bioactivation and Tissue Toxicity

Bioactivation is a metabolic process that transforms less reactive substances into highly reactive metabolites, initiating tissue toxicity. This transformation can lead to various toxic effects, including carcinogenesis and teratogenesis. Reactive metabolites are classified into two main types: electrophiles and free radicals.Electrophiles are electron-deficient species and are produced primarily by the enzyme cytochrome P-450 during the metabolism of compounds containing carbon, nitrogen, or...
Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems01:19

Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems

Phase I biotransformation reactions are integral to drug metabolism, predominantly involving oxidative, reductive, and hydrolytic transformations. Chief among these are oxidative reactions, which enhance the hydrophilicity of xenobiotics and introduce polar functional groups to facilitate their elimination from the body.
Oxidation reactions are fundamental in aromatic carbon-containing systems. An example is the hydroxylation of phenobarbital, a process that transforms it into...
Physiological Pharmacokinetic Models: Incorporating Hepatic Transporter-Mediated Clearance01:07

Physiological Pharmacokinetic Models: Incorporating Hepatic Transporter-Mediated Clearance

Drug transporters are critical in drug absorption, distribution, and excretion processes. They should be included in physiological-based pharmacokinetic (PBPK) models, which help predict human drug disposition. However, predicting this is challenging during drug development, especially when liver transport is involved. However, with a realistic representation of body transport processes, an accurate model may be possible.
A recent model describes pravastatin's hepatobiliary excretion, mediated...

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Formation of Covalent DNA Adducts by Enzymatically Activated Carcinogens and Drugs In Vitro and Their Determination by 32P-postlabeling
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Published on: March 20, 2018

一种高度反应的p450模型化合物.

Seth R Bell1, John T Groves

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.

Journal of the American Chemical Society
|June 26, 2009
PubMed
概括
此摘要是机器生成的。

这项研究详细介绍了细胞染色体P450模型化合物I,[OFe(IV) -4-TMPyP](+) (1) 的快速C-H氧化反应. 该研究强调了其非凡的反应速度,并提供了对这些重要的生物催化剂高反应性机制的见解.

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Formation of Covalent DNA Adducts by Enzymatically Activated Carcinogens and Drugs In Vitro and Their Determination by 32P-postlabeling
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科学领域:

  • 生物化学和生物物理化学
  • 有机金属化学 有机金属化学
  • 催化剂是一种催化剂.

背景情况:

  • 细胞染色体P450酶对于代谢各种基质至关重要.
  • 了解它们的活性部位的反应性,特别是化合物I,是阐明它们的生物功能的关键.
  • 模型化合物对于研究这些复杂系统的基本化学是必不可少的.

研究的目的:

  • 为了检测和动态表征一个特定的细胞P450化合物I模型,[OFe(IV) -4-TMPyP](+) (1).
  • 为了研究这种模型化合物介导的C-H化反应的反应速率和机制.
  • 为了将观察到的反应性与模型的电子和结构性质相关联.

主要方法:

  • 停止流量光谱光度测量用于监测中间体的形成和衰变.
  • 核磁共振 (NMR) 光谱 (1H和13C) 用于识别反应产物.
  • 电子喷雾电离质谱法 (ESI-MS) 用于确定氧气的结合.
  • 使用脱基质的动态同位素效应研究.

主要成果:

  • 检测到中间体[OFe(IV) -4-TMPyP](+) (1) 形成的高二次速率常数 (1.59 x 107 M−1s−1).
  • 化合物1表现出C-H化过程的异常二次速率常数 (例如,桑的3.6×106M−1s−1).
  • 产品分析和动态同位素效应表明一种同质化抽象机制.
  • 氧气反弹和布伦斯特德-埃文斯-波兰尼分析为过渡状态和债券能量提供了洞察力.

结论:

  • 细胞染色体P450模型化合物I,[OFe(IV) -4-TMPyP](+),在C-H基化中表现出异常高的反应性.
  • 高氨酸氧化还原潜力和旋转状态交叉现象被认为是这种反应的起源.
  • 微妙的活性部位修改可以显著提高P450酶的催化效率.