Abstract
The combination of MicroScale Thermophoresis (MST) and near-native site-specific His-tag labeling enables simple, robust, and reliable determination of the binding affinity between proteins and ligands. To demonstrate its applicability for periplasmic proteins, we provide a detailed protocol for determination of the binding affinity of phosphite to three ABC transporter periplasmic-binding proteins from environmental microorganisms. ABC transporters are central to many important biomedical phenomena, including resistance of cancers and pathogenic microbes to drugs. The protocol described here can be used to quantify protein-ligand and protein-protein interactions for other soluble, membrane-associated and integral membrane proteins.
Key words
- MicroScale thermophoresis58
- Membrane proteins
- ABC transporter
- His-tag labeling
- RED-tris-NTA
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Bartoschik, T., Gupta, A., Kern, B., Hitchcock, A., Adams, N.B.P., Tschammer, N. (2020). Quantifying the Interaction of Phosphite with ABC Transporters: MicroScale Thermophoresis and a Novel His-Tag Labeling Approach. In: Postis, V.L.G., Goldman, A. (eds) Biophysics of Membrane Proteins. Methods in Molecular Biology, vol 2168. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-0724-4_2
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DOI: https://doi.org/10.1007/978-1-0716-0724-4_2
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