Molecular Docking Studies and the Effect of Fluorophenylthiourea Derivatives on Glutathione-Dependent Enzymes

Area of Science:

• Biochemistry
• Enzymology
• Cancer Research

Background:

• Glutathione S-transferases (GSTs) and Glutathione reductase (GR) are crucial enzymes in cellular detoxification and antioxidant defense.
• GSTs protect cells from reactive electrophiles, including chemotherapy agents, while GR combats oxidative stress.
• Understanding enzyme inhibition is vital for developing novel cancer therapies.

Purpose of the Study:

• To purify GST and GR enzymes from human erythrocytes.
• To investigate the inhibitory effects of fluorophenylthiourea derivatives on purified GST and GR.
• To elucidate the molecular interactions between inhibitors and enzymes using molecular docking.

Main Methods:

• Affinity chromatography was employed for the purification of GST and GR enzymes.
• Enzyme activity and inhibition kinetics (K_I values) were determined for various fluorophenylthiourea derivatives.
• Molecular docking studies were performed to analyze the binding interactions of inhibitors with enzyme 3D structures.

Main Results:

• GST and GR enzymes were successfully purified with high specific activities and yields.
• Fluorophenylthiourea derivatives exhibited varying degrees of inhibition against both GST and GR.
• 1-(2,6-difluorophenyl)thiourea demonstrated the most potent inhibitory effect on both enzymes, with K_I values in the micromolar range.
• Molecular docking studies provided insights into the binding modes of the inhibitors within the active sites of GST and GR.

Conclusions:

• The study successfully purified key detoxification and antioxidant enzymes, GST and GR.
• Fluorophenylthiourea derivatives, particularly 1-(2,6-difluorophenyl)thiourea, show promise as inhibitors of GST and GR.
• These findings contribute to the understanding of enzyme inhibition mechanisms and could inform the design of new anticancer agents targeting these enzymes.