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Updated: Jun 15, 2026
Spectrophotometric Screening for Potential Inhibitors of Cytosolic Glutathione S-Transferases
Published on: October 10, 2020
Isozyme-specific fluorescent inhibitor of glutathione s-transferase omega 1
Abstract:
Recently, the glutathione S-transferase omega 1 (GSTO1) is suspected to be involved in certain cancers and neurodegenerative diseases. However, profound investigation on the pathological roles of GSTO1 has been hampered by the lack of specific methods to determine or modulate its activity in biological systems containing other isoforms with similar catalytic function. Here, we report a fluorescent compound that is able to inhibit and monitor the activity of GSTO1. We screened 43 fluorescent chemicals and found a compound (6) that binds specifically to the active site of GSTO1. We observed that compound 6 inhibits GSTO1 by covalent modification but spares other isoforms in HEK293 cells and demonstrated that compound 6 could report the activity of GSTO1 in NIH/3T3 or HEK293 cells by measuring the fluorescence intensity of the labeled amount of GSTO1 in SDS-PAGE. Compound 6 is a useful tool to study GSTO1, applicable as a specific inhibitor and an activity reporter.
Insights
A novel fluorescent compound specifically inhibits and monitors glutathione S-transferase omega 1 (GSTO1) activity. This tool aids research into GSTO1
Area of Science:
- Biochemistry
- Molecular Biology
- Chemical Biology
Background:
- Glutathione S-transferase omega 1 (GSTO1) involvement in diseases like cancer and neurodegeneration is suspected.
- Investigating GSTO1's pathological roles is challenging due to a lack of specific activity-monitoring tools, especially in the presence of similar enzyme isoforms.
Discussion:
- A newly developed fluorescent compound (compound 6) specifically targets and inhibits GSTO1's active site.
- Compound 6 achieves inhibition through covalent modification, crucially sparing other GST isoforms.
- This compound enables the monitoring of GSTO1 activity in cellular systems (HEK293, NIH/3T3) via fluorescence detection.
Key Insights:
- Compound 6 acts as a specific inhibitor for GSTO1.
- Compound 6 functions as a reporter for GSTO1 activity.
- The compound's specificity allows for precise study of GSTO1 in complex biological samples.
Outlook:
- Compound 6 offers a valuable tool for advancing research into GSTO1's function in health and disease.
- Further applications may include drug discovery targeting GSTO1-related pathologies.
- This development facilitates deeper understanding of GSTO1's role in cancer and neurodegenerative disease pathways.
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