Efficient and inexpensive method for purification of heparin binding proteins

Area of Science:

• Biochemistry
• Protein Purification
• Biotechnology

Background:

• Heparin-binding (HB) proteins are crucial for cellular processes and have significant biopharmaceutical importance.
• Engineering HB proteins requires efficient and cost-effective purification methods beyond current standards.
• Fibroblast growth factors (FGFs) and their receptors (FGFRs) are key HB proteins.

Purpose of the Study:

• To develop an efficient off-column purification method for FGF-1 and the D2 domain of FGFR.
• To provide a cost-effective alternative to conventional affinity chromatography for purifying HB proteins.
• To demonstrate the utility of weak cation exchangers for recombinant protein purification.

Main Methods:

• Expression of FGF-1 and FGFR D2 domain in Escherichia coli.
• Purification using a weak Amberlite cation (IRC) exchanger, applied off-column.
• Analysis of protein conformation using heparin binding chromatography and steady state fluorescence experiments.

Main Results:

• Homogeneous purification of FGF-1 from soluble fractions and FGFR D2 domain from insoluble inclusion bodies using IRC resin.
• Demonstrated that the purified FGF-1 and D2 domain are in a native conformation.
• Established an efficient and cost-effective purification strategy as an alternative to affinity chromatography.

Conclusions:

• The developed IRC-based purification method is efficient and cost-effective for FGF-1 and FGFR D2 domain.
• This approach offers a viable alternative to conventional affinity chromatography, reducing production costs.
• The findings facilitate further investigation of HB proteins and enable inexpensive purification of other biological macromolecules.