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Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes01:28

Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes

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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...
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Drug Metabolism: Phase I Reactions01:17

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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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Pharmacogenetics of Drug Transporters: P-Glycoprotein and Solute Carrier Transporters01:16

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The pharmacogenetics of drug transporters is increasingly recognized as a critical factor influencing interindividual variability in drug absorption, distribution, and elimination. These membrane-bound proteins regulate drugs' movement across cellular barriers by actively pumping them out (efflux) or facilitating their uptake (influx). Among the major transporter families, ATP-binding cassette (ABC) and solute carrier (SLC) transporters play particularly prominent roles. Genetic polymorphisms...
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Pharmacogenetics of Drug Metabolism: Overview01:27

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Genetic polymorphism in drug metabolism is crucial to the inter-individual variability observed in drug responses. Drug metabolism primarily involves the chemical modification of drugs and other xenobiotics to enhance their elimination by increasing their polarity. Two main classes of enzymes mediate this biotransformation process: Phase I enzymes, primarily cytochrome P450s, catalyze oxidation and reduction reactions, while other enzymes, such as esterases, mediate hydrolysis, and Phase II...
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Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase01:27

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Phase II biotransformation reactions are essential for detoxifying and eliminating xenobiotics, including many pharmaceutical compounds. These reactions typically involve conjugation, the covalent attachment of polar endogenous groups such as glucuronic acid, sulfate, methyl, or acetyl moieties to functional groups introduced during Phase I metabolism. The resulting conjugates are more water-soluble, enabling efficient renal or biliary excretion.The major classes of Phase II enzymes include...
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Electron Transport Chain: Complex III and IV01:43

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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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Cytochrome P450cin (CYP176A1).

Jeanette E Stok1, Kate E Slessor, Anthony J Farlow

  • 1School of Chemistry and Molecular Biosciences, University of Queensland, St. Lucia, Brisbane, 4072, Australia.

Advances in Experimental Medicine and Biology
|May 24, 2015
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Summary

Cytochrome P450cin (P450cin) is a bacterial enzyme that hydroxylates 1,8-cineole. Its unique structure and redox partner offer insights into P450 enzyme mechanisms and applications.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Microbial Biotechnology

Background:

  • Cytochrome P450cin (P450cin), also known as CYP176A1, is a bacterial enzyme.
  • It catalyzes the enantiospecific hydroxylation of 1,8-cineole to (1R)-6β-hydroxycineole.

Purpose of the Study:

  • To review current knowledge of P450cin.
  • To highlight how P450cin enhances understanding of cytochrome P450 enzymes.

Main Methods:

  • Reconstitution of P450cin with its natural redox partner, cindoxin, and NADPH.
  • Characterization of P450cin's catalytic activity and unusual structural features.

Main Results:

  • P450cin exhibits high catalytic rates (up to 1,500 min⁻¹).
  • It possesses an atypical asparagine residue instead of the conserved threonine, impacting oxygen activation.
  • P450cin utilizes an FMN-containing redoxin (cindoxin), unlike the typical ferredoxin in other bacterial P450s.

Conclusions:

  • P450cin's unique characteristics provide valuable insights into P450 enzyme mechanisms.
  • The enzyme serves as a useful model for studying P450s due to its preparability and activity.