An orthogonal fusion tag for efficient protein purification

Area of Science:

• Biochemistry
• Molecular Biology
• Protein Engineering

Background:

• Protein fusion tags are essential for protein purification and detection in research.
• Existing methods may lack the stringency required for certain applications.

Purpose of the Study:

• To develop an efficient and stringent method for protein purification using a novel fusion tag.
• To engineer a tag with dual affinity for enhanced purification capabilities.

Main Methods:

• Development of the ABDz1 tag, a fusion protein engineered from an albumin-binding domain of Streptococcal Protein G to also bind Protein A.
• Fusion of the ABDz1 tag to target proteins.
• Purification using two successive affinity chromatography steps.

Main Results:

• The ABDz1 tag exhibits affinity for both human serum albumin and Protein A.
• A stringent purification protocol was established using the ABDz1 tag.
• The method is applicable to various proteins and utilizes standard laboratory equipment.

Conclusions:

• The ABDz1 tag provides an efficient and robust tool for stringent protein purification.
• This dual-affinity tag simplifies protein purification workflows.
• The method is adaptable for diverse research needs in molecular biology and biochemistry.