Related Experiment Video
Updated: Jul 10, 2026

PAR-CliP - A Method to Identify Transcriptome-wide the Binding Sites of RNA Binding Proteins
Published on: July 2, 2010
Direct binding of ligandin to uridine 5'-diphosphate glucuronosyltransferase 1A1
Emi Akizawa1, Kotaro Koiwai, Takahide Hayano
1Department of Applied Biological Science, Tokyo University of Science, Chiba, Japan.
Aim:
Bilirubin, a final degradation product of heme produced mainly in the spleen, is carried to the liver through its binding to albumin in the blood circulation. After its transport to hepatocytes, ligandin (glutathione S-transferase; GST) carries bilirubin to the endoplasmic reticulum (ER). uridine 5'-diphosphate-glucuronosyltransferase 1A1 (UGT1A1) glucuronidates bilirubin for solubilization in the ER.
Methods:
By GST pull-down and co-immunoprecipitation assays, GSTA2, a member of the alpha-class of GST, was observed to directly bind to UGT1A1 through the region present inside the ER.
Results:
GSTA2 was detected in the microsomal fraction together with the cytosolic fraction after hepatocyte fractionation.
Conclusion:
These results strongly suggest that bilirubin is directly delivered to UGT1A1 from ligandin for glucuronidation.
More Related Videos
11:46Extremely Rapid and Specific Metabolic Labelling of RNA In Vivo with 4-Thiouracil (Ers4tU)
Published on: August 22, 2019
10:25Screening Traditional Chinese Medicine Compounds for Inhibiting UCHL3 Activity Based on Molecular Docking and Deubiquitinating Enzyme Probe Technology
Published on: November 22, 2024
Related Concept Videos
Phase II Reactions: Glucuronidation
Ligand Binding and Linkage
Ligand Binding and Linkage
Drug Metabolism: Phase II Reactions
Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase
Protein Folding Quality Check in the RER