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Updated: Mar 8, 2026

Protein Purification-free Method of Binding Affinity Determination by Microscale Thermophoresis
Published on: August 15, 2013
Expression and Purification of Soluble STAT5b/STAT3 Proteins for SH2 Domain Binding Assay
Akira Asai1, Kazuyuki Takakuma2,3
1Center for Drug Discovery, Graduate School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan. aasai@u-shizuoka-ken.ac.jp.
Abstract:
When a large hydrophobic full-length protein is expressed in bacteria, it is often challenging to obtain recombinant proteins in the soluble fraction. One way to overcome this challenge is expression of deletion mutants that have improved solubility while maintaining biological activity. In this chapter, we describe a protocol for expression of truncated forms of STAT5b and STAT3 proteins that are soluble and retain SH2-mediated activity for phospho-Tyr peptide recognition.

