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Related Concept Videos

Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation01:22

Phase II Reactions: Glutathione Conjugation and Mercapturic Acid Formation

Glutathione, a tripeptide made up of glutamate, cysteine, and glycine, is a critical player in the detoxification of drugs and xenobiotics via a process known as glutathione conjugation or mercapturic acid formation. This phase II biotransformation reaction involves the covalent binding of glutathione to a drug or its metabolite, enhancing the compound's water solubility and enabling its excretion.
Several distinctive characteristics distinguish glutathione conjugation from other phase II...
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...
Phase II Reactions: Sulfation and Conjugation with α-Amino Acids01:19

Phase II Reactions: Sulfation and Conjugation with α-Amino Acids

Sulfation and α-amino acid conjugation are two critical biotransformation reactions in drug metabolism. Sulfation, a phase II biotransformation reaction, involves adding a polar sulfate group to a drug, enhancing its water solubility and promoting excretion. This process can either co-occur with or occur independently of glucuronidation. Nonmicrosomal sulfotransferase enzymes catalyze the process. The reaction involves 3'-phosphoadenosine-5'-phosphosulfate or PAPS coenzyme activation, sulfur...
Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase01:27

Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase

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...
Phase II Reactions: Acetylation Reactions01:24

Phase II Reactions: Acetylation Reactions

Acetylation, a phase II biotransformation reaction, introduces an acetyl group to drugs or their metabolites. Acetyltransferase enzymes facilitate this reaction, which resembles α-amino acid conjugation due to the addition of a functional group to the drug molecule.
The substrates for acetylation are typically drugs or their metabolites with an amino, sulfonamide, or hydrazine functional group. Acetylation can occur at several points in the drug molecule, including primary, secondary, and...
Phase II Reactions: Glucuronidation01:24

Phase II Reactions: Glucuronidation

Glucuronidation, a pivotal phase II biotransformation process, involves the coupling of glucuronic acid to a drug or xenobiotic. Given its widespread occurrence and critical role in drug metabolism, it's considered the most crucial phase II reaction. It enhances the water solubility of substances, aiding their expulsion from the body. The driving force behind these reactions is a group of enzymes known as UDP-glucuronosyltransferases (UGTs). UGTs facilitate the transfer of a glucuronic acid...

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Related Experiment Video

Updated: Jul 13, 2026

Spectrophotometric Screening for Potential Inhibitors of Cytosolic Glutathione S-Transferases
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Spectrophotometric Screening for Potential Inhibitors of Cytosolic Glutathione S-Transferases

Published on: October 10, 2020

Glutathionylation pathways in drug response.

Pietro Ghezzi1, Paolo Di Simplicio

  • 1Laboratory of Neuroimmunology, Mario Negri Institute, 20157 Milano, Italy. pietro.ghezzi@libero.it

Current Opinion in Pharmacology
|July 6, 2007
PubMed
Summary

Protein glutathionylation, a key post-translational modification (PTM), is understudied for therapeutic targeting. Further research is needed to clarify its disease relevance and distinct roles in redox regulation versus oxidative stress.

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LERLIC-MS/MS for In-depth Characterization and Quantification of Glutamine and Asparagine Deamidation in Shotgun Proteomics
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Last Updated: Jul 13, 2026

Spectrophotometric Screening for Potential Inhibitors of Cytosolic Glutathione S-Transferases
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Spectrophotometric Screening for Potential Inhibitors of Cytosolic Glutathione S-Transferases

Published on: October 10, 2020

Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho -phthalaldehyde in Cultured Mammalian Cells In Vitro
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Rapid Quantification of Oxidized and Reduced Forms of Glutathione Using Ortho -phthalaldehyde in Cultured Mammalian Cells In Vitro

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LERLIC-MS/MS for In-depth Characterization and Quantification of Glutamine and Asparagine Deamidation in Shotgun Proteomics
08:01

LERLIC-MS/MS for In-depth Characterization and Quantification of Glutamine and Asparagine Deamidation in Shotgun Proteomics

Published on: April 9, 2017

Area of Science:

  • Biochemistry
  • Pharmacology
  • Molecular Biology

Background:

  • Post-translational modifications (PTMs) regulate protein function and are key pharmacological targets.
  • Existing drugs target specific PTMs like protein kinase or histone deacetylase inhibitors.
  • Protein glutathionylation remains an under-explored PTM for therapeutic intervention due to unclear biological roles.

Purpose of the Study:

  • To highlight the potential of protein glutathionylation as a pharmacological target.
  • To discuss the unclear biological consequences and roles of protein glutathionylation.
  • To compare glutathionylation with other PTMs regarding disease relevance and biases.

Main Methods:

  • Literature review and conceptual discussion.
  • Analysis of existing knowledge on protein glutathionylation.
  • Comparative assessment of glutathionylation against other PTMs.

Main Results:

  • Protein glutathionylation's therapeutic potential is largely unrealized.
  • The biological significance and specific functions of glutathionylation are not well-defined.
  • Distinguishing glutathionylation's roles in redox regulation versus oxidative stress presents challenges due to conceptual overlaps.

Conclusions:

  • Protein glutathionylation warrants further investigation as a potential pharmacological target.
  • Clarifying the distinct roles of glutathionylation in redox biology and disease is crucial.
  • Addressing the complexities of glutathionylation in redox regulation and oxidative stress is necessary for future drug development.