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Method for Preparing Recombinant Galectin-2 Protein without Escherichia coli-Specific Post-translational

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Researchers developed methods to produce pure recombinant galectin-2 (Gal-2) proteins for potential therapeutic use. Modifications to human Gal-2 and mouse Gal-2 expression in E. coli yielded homogeneous proteins, crucial for drug development.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Engineering

Background:

  • Galectin-2 (Gal-2) is a β-galactoside-binding animal lectin with a protective role in the gastrointestinal tract.
  • Recombinant Gal-2 is essential for functional studies and potential protein drug development.
  • Previous recombinant Gal-2 expression in Escherichia coli resulted in heterogeneous protein preparations.

Purpose of the Study:

  • To develop methods for obtaining homogeneous recombinant human Gal-2 (hGal-2) and mouse Gal-2 (mGal-2) proteins.
  • To address issues of phosphogluconoylation in hGal-2 and stop codon mistranslation in mGal-2.
  • To enable further functional studies and therapeutic applications of Gal-2.

Main Methods:

  • For hGal-2: replaced phosphogluconoylated lysine residues with arginine and utilized an N-terminal histidine-tag with protease cleavage.
  • For mGal-2: modified the stop codon from TGA to TAA to prevent mistranslation.
  • Expressed and purified modified recombinant proteins using Escherichia coli and affinity chromatography.

Main Results:

  • Achieved almost homogeneous preparations of both recombinant hGal-2 and mGal-2.
  • Identified and corrected post-translational modifications and expression errors in recombinant Gal-2.
  • Demonstrated the efficacy of the applied protein engineering strategies.

Conclusions:

  • Developed robust methods for producing pure recombinant Gal-2 proteins.
  • Homogeneous Gal-2 is critical for accurate functional studies and therapeutic development.
  • These findings support the advancement of Gal-2 as a protein drug candidate.