Abstract
Thermal shift assay (TSA), also commonly designed by differential scanning fluorimetry (DSF) or ThermoFluor, is a technique relatively easy to implement and perform, useful in a myriad of applications. In addition to versatility, it is also rather inexpensive, making it suitable for high-throughput approaches. TSA uses a fluorescent dye to monitor the thermal denaturation of the protein under study and determine its melting temperature (Tm). One of its main applications is to identify the best buffers and additives that enhance protein stability.
Understanding the TSA operating mode and the main methodological steps is a central key to designing effective experiments and retrieving meaningful conclusions. This chapter intends to present a straightforward TSA protocol, with different troubleshooting tips, to screen effective protein stabilizers such as buffers and additives, as well as data treatment and analysis. TSA results provide conditions in which the protein of interest is stable and therefore suitable to carry out further biophysical and structural characterization.
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Acknowledgments
This work was supported by the Applied Molecular Biosciences Unit UCIBIO (UIDB/04378/2020 and UIDP/04378/2020) and the Associate Laboratory Institute for Health and Bioeconomy–i4HB (project LA/P/0140/2020) which are financed by National Funds from Fundação para a Ciência e Tecnologia (FCT). Filipa S. S. Engrola (UID/04378/2020) acknowledges her PhD Fellowship to UCIBIO and FCT; João Paquete-Ferreira (2020.08580.BD) and Francisco Leisico (PD/BD/105737/2014) acknowledge their PhD Fellowships to FCT. The authors would like to thank the current and past members of the Macromolecular Crystallography Lab (UCIBIO, FCT-NOVA) for their valuable suggestions over the years, contributing to the development of this easy-to-follow protocol. Filipe Freire and João Ramos are acknowledged for their critical reading of some sections of the presented chapter.
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Engrola, F.S.S., Paquete-Ferreira, J., Santos-Silva, T., Correia, M.A.S., Leisico, F., Santos, M.F.A. (2023). Screening of Buffers and Additives for Protein Stabilization by Thermal Shift Assay: A Practical Approach. In: Sousa, Â., Passarinha, L. (eds) Advanced Methods in Structural Biology. Methods in Molecular Biology, vol 2652. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3147-8_11
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DOI: https://doi.org/10.1007/978-1-0716-3147-8_11
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