Abstract
Fluorescence polarization (FP) assays can be used to identify small-molecule inhibitors that bind to SH2 domain-containing proteins. We have developed FP assays by which to identify inhibitors of the SH2 domains of the two closely-related transcription factors STAT5a and STAT5b. Point mutation of selected amino acids in the putative binding site of the protein is a valuable tool by which to gain insight into the molecular mechanism of binding. In this chapter, we describe the cloning and application of point mutant proteins in order to transfer the binding preference of selected SH2 domain-binding STAT5b inhibitors to STAT5a, with results that highlight the importance of considering a role for residues outside the SH2 domain in contributing to the binding interactions of SH2 domain inhibitors.
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Acknowledgments
This work was generously supported by the Deutsche Forschungsgemeinschaft (BE 4572/4-1) and the European Union and the Free State of Saxony, European Regional Development Fund.
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Berg, A., Gräb, J., Klüver, B., Berg, T. (2023). Dissecting Selectivity Determinants of Small-Molecule Inhibitors of SH2 Domains Via Fluorescence Polarization Assays. In: Carlomagno, T., Köhn, M. (eds) SH2 Domains. Methods in Molecular Biology, vol 2705. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3393-9_12
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DOI: https://doi.org/10.1007/978-1-0716-3393-9_12
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