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Site-directed immobilization of proteins
P L Domen1, J R Nevens, A K Mallia
1Pierce Chemical Co., Rockford, IL 61105.
Journal of Chromatography
|June 27, 1990
Summary
Antibody immobilization using CarboLink Gel effectively orients antibodies for optimal antigen binding. This method maximizes bivalent binding potential, significantly improving antigen purification capabilities compared to other immobilization chemistries.
Area of Science:
- Bioconjugation Chemistry
- Immunology
- Protein Immobilization
Background:
- Antibody orientation on supports is crucial for maximizing antigen binding.
- Current immobilization methods may not fully utilize the bivalent binding potential of antibodies.
Purpose of the Study:
- To evaluate different immobilization chemistries for orienting antibodies on supports.
- To determine the most effective method for enhancing antigen purification capabilities.
Main Methods:
- Development of three activated matrices: AminoLink Gel, SulfoLink Gel, and CarboLink Gel.
- Coupling antibodies to matrices via different functional groups (amino, sulfhydryl, carbohydrate moieties).
- Quantification of immobilized antibody to purified antigen molar ratios.
Main Results:
- Random immobilization via AminoLink Gel yielded a 1:1 antibody-to-antigen ratio.
- SulfoLink Gel showed only slight improvement in the antibody-to-antigen ratio.
- CarboLink Gel, coupling via Fc-located carbohydrates, achieved an optimal 1:2 antibody-to-antigen ratio.
Conclusions:
- CarboLink Gel is superior for orienting antibodies to maximize antigen binding.
- Immobilization chemistry significantly impacts antibody orientation and purification efficiency.
- CarboLink Gel enables full utilization of antibody bivalent binding potential for improved antigen purification.