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Phase II Reactions: Glucuronidation

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...

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

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...

Drug Metabolism: Phase II Reactions

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...

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

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

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...

Glucose Transporters

Glucose Transporters

Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
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Aquaporins

Aquaporins

Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.

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Related Experiment Video

Updated: Jul 13, 2026

Uracil-DNA Glycosylase Assay by Matrix-assisted Laser Desorption/Ionization Time-of-flight Mass Spectrometry Analysis

Uracil-DNA Glycosylase Assay by Matrix-assisted Laser Desorption/Ionization Time-of-flight Mass Spectrometry Analysis

Published on: April 22, 2022

Piscine UDP-glucuronosyltransferase 1B.

Michael J Leaver¹, Joy Wright¹, Paul Hodgson¹

¹Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, UK.

Aquatic Toxicology (Amsterdam, Netherlands)

|August 10, 2007

Summary

Researchers identified UDP-glucuronosyltransferases (UGT) genes in flatfish, crucial for detoxifying pollutants. These UGT1B genes are expressed in various tissues and respond to environmental contaminants, aiding in detoxification.

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A Scalable, Cell-Based Method for the Functional Assessment of Ube3a Variants

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Published on: October 10, 2022

Area of Science:

Marine biology
Biochemistry
Genomics

Background:

Glucuronidation is a key detoxification pathway for organic pollutants in fish.
UDP-glucuronosyltransferases (UGTs) mediate this process.
Understanding fish UGTs is vital for assessing environmental health and pollutant impacts.

Purpose of the Study:

To isolate and characterize UDP-glucuronosyltransferase (UGT) genes from plaice and flounder.
To investigate the expression patterns and inducibility of these UGT genes.
To determine the substrate specificity and phylogenetic relationship of fish UGTs.

Main Methods:

Gene isolation and sequencing from plaice and flounder.
mRNA expression analysis using Northern blotting and real-time PCR.
Enzyme activity assays in heterologous expression systems (Cos7 cells).
Phylogenetic analysis comparing fish UGT sequences with mammalian UGT families.

Main Results:

Identified and characterized UGT1B genes in plaice and flounder, showing high similarity to mammalian UGT1 family.
UGT1B mRNA is expressed in all tissues, with highest levels in liver, and is regulated during development.
Flounder UGT1B expression increased after exposure to certain pollutants (Aroclor 1254, lindane, benzo(a)pyrene) but not others.
Plaice UGT1B demonstrated phenol-conjugating activity, suggesting a role in detoxifying polyaromatic hydrocarbons.
UGT1B genes are conserved across vertebrates, with variations in genomic organization.

Conclusions:

The identified fish UGT1B genes play a significant role in the detoxification of organic pollutants, particularly polyaromatic hydrocarbons.
UGT1B genes are integral components of the vertebrate UGT1 family.
Further research is needed to elucidate the role of UGT1B in fish development.