Purification of Recombinant Galectins from Different Species Using Distinct Affinity Chromatography Methods

Area of Science:

• Biochemistry
• Molecular Biology
• Glycobiology

Background:

• Galectins are a conserved family of carbohydrate-binding proteins recognizing beta-galactose structures.
• Their widespread distribution across taxa suggests vital biological roles, yet these remain incompletely understood.
• Active recombinant galectins are essential for functional and biochemical characterization.

Purpose of the Study:

• To describe robust methods for the recombinant expression and purification of galectins.
• To provide detailed protocols for obtaining active galectins suitable for biochemical assays.
• To facilitate further research into galectin physiological and biochemical functions.

Main Methods:

• Recombinant expression of fungal (Coprinopsis cinerea galectin 2) and human galectins.
• Affinity purification using lactosyl-Sepharose chromatography.
• Affinity purification using nickel-chromatography (for His-tagged galectins) and glutathione-Sepharose chromatography (for GST-tagged galectins).

Main Results:

• Successful recombinant expression of CGL2, His-tagged human galectin-7, and GST-tagged human galectin-7.
• Purified galectins demonstrated retained carbohydrate-binding activity.
• Established step-by-step protocols for reproducible purification.

Conclusions:

• The described methods provide reliable means to obtain active recombinant galectins.
• These purified galectins are suitable for diverse biochemical experiments.
• The protocols will aid in elucidating the precise biological functions of galectins.