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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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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...
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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...
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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.

Søren Bak, Fred Beisson, Gerard Bishop

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

    The Arabidopsis genome contains 244 cytochrome P450 genes, crucial for plant metabolism. Despite their large number, these genes show limited functional redundancy, highlighting their diverse roles in plant biochemistry.

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    Area of Science:

    • Plant molecular biology
    • Biochemistry
    • Genomics

    Background:

    • Cytochrome P450s (P450s) constitute one of the largest gene families in plants, with 244 genes and 28 pseudogenes identified in the Arabidopsis genome.
    • Initial assumptions suggested significant functional redundancy within this gene family.

    Purpose of the Study:

    • To investigate the functional diversity and redundancy of cytochrome P450 genes in Arabidopsis.
    • To understand the role of P450s in plant metabolic complexity and evolution.

    Main Methods:

    • Genomic analysis to identify P450 genes and pseudogenes.
    • Comparative sequence analysis to assess gene identity and evolutionary relationships.
    • Review of existing literature on P450-catalyzed reactions and their involvement in plant metabolic pathways.

    Main Results:

    • The Arabidopsis genome harbors 244 P450 genes, representing a substantial gene family.
    • Contrary to expectations, P450 diversification leads to limited functional redundancy.
    • These genes catalyze a wide array of reactions, essential for structural macromolecules, hormones, pigments, and defense compounds, and xenobiotic metabolism.

    Conclusions:

    • Arabidopsis P450s exhibit remarkable functional specialization, mirroring the complexity of plant metabolism.
    • Understanding gene duplication and diversification mechanisms, alongside co-expression data, is key to characterizing P450 functions.