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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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Electron Transport Chain: Complex III and IV

During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
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,...
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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...
Peroxisomes01:24

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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Cytochromes p450.

Danièle Werck-Reichhart, Søren Bak, Suzanne Paquette

    The Arabidopsis Book
    |February 4, 2012
    PubMed
    Summary
    This summary is machine-generated.

    The Arabidopsis genome contains 272 cytochrome P450 (CYP) genes, one of the largest plant protein families. Despite recent advances, the functions of most CYPs remain unknown, highlighting a significant gap in plant science.

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    Area of Science:

    • Plant molecular biology
    • Genomics
    • Biochemistry

    Background:

    • Cytochrome P450s (CYPs) constitute a vast protein family in plants, with 272 genes identified in Arabidopsis.
    • The expansion of the CYP family is linked to plant adaptation, defense against environmental stressors, pathogens, and predators.
    • Plant CYPs exhibit high diversity in sequence identity and catalytic functions.

    Purpose of the Study:

    • To highlight the significant size and diversity of the cytochrome P450 gene family in Arabidopsis.
    • To underscore the broad range of biological roles performed by plant CYPs.
    • To emphasize the substantial knowledge gaps regarding the functions of most plant CYPs.

    Main Methods:

    • Genome-wide analysis of cytochrome P450 genes in Arabidopsis.
    • Comparative analysis of CYP gene sequences and evolutionary history.
    • Literature review of known CYP functions in plants.

    Main Results:

    • Arabidopsis possesses 272 cytochrome P450 genes, including 26 pseudogenes, representing one of the largest protein families.
    • Plant CYPs catalyze diverse reactions involved in synthesizing structural macromolecules, hormones, pigments, defense compounds, and metabolizing xenobiotics.
    • Despite extensive research, the functions of the majority of plant CYPs remain uncharacterized.

    Conclusions:

    • The large number and functional diversity of plant CYPs suggest critical roles in plant biology and adaptation.
    • Further research is essential to elucidate the functions of the numerous uncharacterized cytochrome P450s in Arabidopsis.
    • Understanding plant CYPs is crucial for advancing plant science, agriculture, and biotechnology.