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Related Concept Videos

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...
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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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High throughput screening assay for UDP-glucuronosyltransferase 1A1 glucuronidation profiling.

O V Trubetskoy1, M Finel, M Kurkela

  • 1Quintessence Biosciences, University of Wisconsin, Madison, WI., School of Pharmacy, University of Wisconsin, Madison, WI 53719, USA. vladimir.trubetskoy@mirusbio.com

Assay and Drug Development Technologies
|July 20, 2007
PubMed
Summary

This study introduces a new fluorescence-based high throughput screening (HTS) assay for UDP-glucuronosyltransferase 1A1 (UGT1A1). This assay utilizes polymeric micelles to improve drug-drug interaction prediction and reduce drug development costs.

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Area of Science:

  • Biochemistry
  • Pharmacology
  • Drug Development

Background:

  • High throughput screening (HTS) assays are crucial for evaluating drug toxicity and interactions.
  • Existing HTS assays for cytochrome P450s are common, but assays for UDP-glucuronosyltransferases (UGTs) are less developed.
  • UGTs play a significant role in drug metabolism and require robust HTS assay development.

Purpose of the Study:

  • To develop a novel fluorescence-based HTS assay for the UGT1A1 enzyme.
  • To characterize the assay's performance in a 384-well plate format using robotic liquid handling.
  • To identify potential assay modifiers (hits) from a small molecule library.

Main Methods:

  • Development of a fluorescence-based HTS assay for UGT1A1.
  • Utilized recombinant UGT1A1 enzyme and a fluorescent substrate.
  • Incorporated PreserveX-QML polymeric micelles as a stabilizer and to block nonspecific interactions.
  • Screened a small molecule library using robotic liquid handling in a 384-well plate format.

Main Results:

  • Established a functional fluorescence-based HTS assay for UGT1A1.
  • Characterized assay performance metrics suitable for robotic liquid handling.
  • Identified assay modifiers from a small molecule library screen.
  • Evaluated the impact of polymeric micelles on assay performance and compound promiscuity.

Conclusions:

  • The developed HTS assay is suitable for UGT1A1 characterization and drug-drug interaction studies.
  • Polymeric micelles enhance assay performance and can mitigate compound promiscuity issues.
  • This assay facilitates the development of better drug candidates and reduces drug development costs.