Non-Affinity Purification of Antibodies

Area of Science:

• Biochemistry
• Protein Chemistry
• Chromatography

Background:

• Current antibody purification relies heavily on Protein A chromatography, a platform technology used across scales.
• Protein A chromatography, despite its widespread use, presents several limitations and drawbacks.
• The need for alternative purification strategies is driven by the inherent challenges of Protein A-based methods.

Purpose of the Study:

• To review the limitations associated with Protein A chromatography in antibody purification.
• To propose a novel, Protein A-free small-scale antibody purification protocol.
• To suggest an alternative large-scale antibody purification strategy using mixed-mode chromatography.

Main Methods:

• A novel agarose native gel electrophoresis and protein extraction technique for small-scale purification.
• Exploration of mixed-mode chromatography, specifically 4-Mercapto-ethyl-pyridine (MEP) column chromatography, for large-scale purification.
• Review of existing literature on Protein A chromatography drawbacks.

Main Results:

• Identification and summarization of key drawbacks of Protein A chromatography.
• Development of a simple, Protein A-free protocol for small-scale antibody purification.
• Proposal of MEP column chromatography as a viable alternative for large-scale antibody purification.

Conclusions:

• Protein A chromatography has significant limitations that necessitate alternative approaches.
• Novel agarose native gel electrophoresis offers a promising Protein A-free method for small-scale antibody purification.
• Mixed-mode chromatography, particularly MEP, presents a scalable and effective alternative to Protein A for industrial antibody purification.