ReBaTSA: A simplified CeTSA protocol for studying recombinant mutant proteins in bacterial extracts

Area of Science:

• Biochemistry
• Molecular Biology
• Protein Science

Background:

• Protein stability is essential in biochemistry, with various methods available for its study.
• The Cellular Thermal Shift Assay (CeTSA) is a recent technique for assessing protein stability within whole cells.

Purpose of the Study:

• To introduce and validate a novel application of CeTSA, termed Recombinant Bacterial Thermal Shift Assay (ReBaTSA).
• To demonstrate a simplified and reliable method for studying protein stability using bacterial extracts.

Main Methods:

• Recombinant Bacterial Thermal Shift Assay (ReBaTSA) was performed on clear bacterial extracts expressing recombinant proteins.
• Samples were incubated at various temperatures, followed by centrifugation and analysis using SDS-PAGE.

Main Results:

• The feasibility and reliability of the ReBaTSA method were successfully demonstrated.
• The method was validated using phosphomannomutase-2 and its mutants, comparing results with and without a known ligand.

Conclusions:

• ReBaTSA offers a simplified and effective approach for studying the stability of recombinant proteins in bacterial systems.
• This method provides a reliable platform for investigating protein-ligand interactions and analyzing protein variants.