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Related Concept Videos

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,...
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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,...
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...
Protein Import into the Peroxisomes01:27

Protein Import into the Peroxisomes

Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
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Electron Transport Chain Components01:29

Electron Transport Chain Components

The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
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Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...

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RNA Interference in Ticks
09:06

RNA Interference in Ticks

Published on: January 20, 2011

What makes a P450 tick?

Andrew W Munro1, Hazel M Girvan, Amy E Mason

  • 1Manchester Institute of Biotechnology, Faculty of Life Sciences, The University of Manchester, 131 Princess Street, Manchester, M1 7DN, UK. andrew.munro@manchester.ac.uk

Trends in Biochemical Sciences
|January 30, 2013
PubMed
Summary
This summary is machine-generated.

Cytochromes P450 (P450s) are versatile enzymes. Recent studies characterized the key intermediate (compound I) and engineered P450 variants, advancing their biotechnological and biomedical applications.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Cytochromes P450 (P450s) are a superfamily of enzymes known for their broad substrate range and diverse oxidative reactions.
  • P450s employ a complex catalytic mechanism to perform highly specific chemical transformations.
  • Understanding P450 function is crucial for various biotechnological and biomedical applications.

Purpose of the Study:

  • To review recent advancements in P450 research.
  • To highlight the definitive characterization of the P450 reaction cycle intermediate, compound I.
  • To discuss the implications of P450 engineering for novel substrate specificity and reactivity.

Main Methods:

  • Characterization of transient reaction cycle intermediates.
  • Structural elucidation of mammalian P450s.
  • Engineering of P450 variants with altered substrate specificity and reactivity.

Main Results:

  • First definitive characterization of compound I, the key intermediate in most P450 oxidative reactions.
  • Elucidation of several mammalian P450 structures.
  • Generation of P450 variants exhibiting novel substrate specificity and reactivity.

Conclusions:

  • Recent breakthroughs in P450 research, particularly the characterization of compound I and enzyme engineering, have significantly advanced the field.
  • These advances pave the way for expanded biotechnological and biomedical exploitation of P450 enzymes.
  • Further research promises to unlock new applications for these versatile enzymes.