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Structure-Based Engineering of a PTPsigma Ectodomain for Enhanced Solubility and Productivity.
Sung Ho Park1, Woochan Lim1, Jian Kang1
1Department of Bioengineering, College of Engineering, Hanyang University, Seoul 04673, Republic of Korea.
International Journal of Molecular Sciences
|September 13, 2025
Summary
Engineered protein tyrosine phosphatase receptor sigma (PTPRS) Ig-like domains show improved solubility and expression yields. This protein engineering enhances therapeutic potential for PTPRS modulation.
Area of Science:
- Biochemistry
- Molecular Biology
- Drug Discovery
Background:
- Protein tyrosine phosphatase receptor sigma (PTPRS) regulates key cellular processes including stem cell development.
- Soluble PTPRS Ig-like domains offer therapeutic potential by blocking ligand binding.
- Wild-type PTPRS domains exhibit poor solubility, hindering therapeutic applications.
Purpose of the Study:
- To engineer PTPRS Ig-like domains with enhanced solubility for therapeutic use.
- To improve expression yields of soluble PTPRS domains.
Main Methods:
- Site-directed mutagenesis of solvent-exposed hydrophobic residues to hydrophilic residues.
- Biochemical and functional analysis of engineered PTPRS variants.
Main Results:
- Engineered PTPRS domains exhibited up to five-fold increase in solubility.
- Expression yields were enhanced by up to 14-fold.
- Mutant proteins retained comparable biochemical and functional properties to wild-type PTPRS.
Conclusions:
- Solubility-enhancing engineering successfully improved PTPRS Ig-like domain properties.
- Engineered PTPRS demonstrates significant potential for therapeutic applications targeting PTPRS pathways.
