Simple and Efficient Purification of Recombinant Proteins Using the Heparin-Binding Affinity Tag

Area of Science:

• Biochemistry
• Molecular Biology
• Protein Chemistry

Background:

• Heparin, a glycosaminoglycan, interacts with over 400 proteins.
• Understanding heparin-protein interactions is crucial for biochemical research.

Purpose of the Study:

• To design a novel heparin-binding peptide (HBP) affinity tag.
• To enable simple, efficient, and cost-effective purification of recombinant proteins.

Main Methods:

• Designed an HBP affinity tag based on FGF1-heparin interaction studies.
• Utilized heparin Sepharose affinity chromatography for purification.
• Employed a sodium chloride gradient for elution.

Main Results:

• HBP-tagged fusion proteins were successfully purified.
• High positive charge density of HBP promoted soluble protein expression.
• Purification was effective even in the presence of denaturants like urea.
• Polyclonal antibodies detected HBP-fused proteins with high sensitivity.

Conclusions:

• The novel HBP affinity tag offers a versatile tool for recombinant protein purification.
• This method enhances protein solubility and allows purification under denaturing conditions.
• HBP technology provides a sensitive detection method for tagged proteins.