Ligand multimerization effects on binding efficiency of Protein L affinity chromatography resins

Area of Science:

• Biotechnology
• Protein Engineering
• Affinity Chromatography

Background:

• Protein-L binds the kappa light chain of immunoglobulins, making it valuable for purifying antibody fragments.
• Improving protein-L resin recovery and dynamic binding capacity is crucial for biotherapeutic production.
• Ligand multimerization is a promising strategy for developing advanced chromatography resins.

Purpose of the Study:

• To engineer novel recombinant protein-L ligands using a multimerization approach.
• To compare the performance of these new ligands against commercial alternatives.
• To evaluate the impact of multimerization on binding capacity, recovery, and purity of antibody fragments.

Main Methods:

• Multimerization of recombinant protein-L to create new ligands (ProL6, ProL8).
• Dynamic binding capacity studies using engineered and commercial resins (ProL4, Capto-L).
• Assessment of Fab antibody fragment recovery and purity from bacterial lysates via SDS-PAGE.

Main Results:

• Engineered ProL6 and ProL8 resins showed higher dynamic binding capacities than ProL4 and Capto-L.
• Recovery rates for Fab fragments were high and comparable across ProL6, ProL8, and commercial resins (92.8-94.6%).
• SDS-PAGE confirmed high purity of eluted proteins, and 100% specificity was observed for ProL6, ProL8, and commercial resins.

Conclusions:

• Multimerized protein-L ligands (ProL6, ProL8) offer improved dynamic binding capacity for antibody fragment purification.
• These engineered ligands provide efficient recovery and high purity, comparable to existing commercial options.
• The multimerization strategy presents a viable approach for developing cost-effective and high-performance affinity chromatography resins.