Human glutathione-S-transferase: cloning and expression in Lactococcus lactis

Area of Science:

• Biochemistry
• Molecular Biology
• Microbial Biotechnology

Background:

• Glutathione-S-transferases (GSTs) are crucial enzymes involved in detoxification.
• Human glutathione-S-transferase A1 (hGSTA1) plays a significant role in cellular defense mechanisms.
• Efficient expression systems are needed for studying and utilizing hGSTA1.

Purpose of the Study:

• To express human glutathione-S-transferase A1 (hGSTA1) in a microbial host.
• To purify and characterize the enzymatic activity of the expressed hGSTA1.
• To establish a system for producing functional hGSTA1.

Main Methods:

• Amplification of hGSTA1 cDNA from human liver RNA using RT-PCR.
• Cloning of hGSTA1 into the expression plasmid pMG36e.
• Heterologous expression of hGSTA1 in Lactococcus lactis MG1363.
• Verification of expression using SDS-PAGE and Western blot.
• Purification of hGSTA1 via affinity chromatography.

Main Results:

• Successful amplification and cloning of hGSTA1 cDNA.
• Expression of recombinant hGSTA1 in Lactococcus lactis confirmed by SDS-PAGE and Western blot.
• Purified hGSTA1 exhibited measurable enzymatic activity.
• The microbial expression system yielded functional hGSTA1.

Conclusions:

• Lactococcus lactis is a suitable host for the expression of functional human glutathione-S-transferase A1.
• The developed system allows for the production and purification of active hGSTA1.
• This work provides a foundation for further investigation into hGSTA1 function and applications.