Epitope-directed antibody selection by site-specific photocrosslinking.

Area of Science:

• Biochemistry
• Immunology
• Molecular Biology

Background:

• Selecting antibodies for specific conformational epitopes remains a challenge.
• Existing methods lack precision in identifying epitope-specific antibody binders.

Purpose of the Study:

• To develop and validate a novel method for epitope-directed antibody selection.
• To enable the identification of antibodies binding to specific conformational epitopes on target antigens.

Main Methods:

• Incorporation of a noncanonical amino acid, p-benzoyl-l-phenylalanine (pBpa), into target antigen epitopes.
• Photocrosslinking of bound antibodies to the pBpa-modified epitope upon ultraviolet irradiation.
• Selection and enrichment of antibody phage display libraries through panning against modified antigens.

Main Results:

• Successful application of the method to human interleukin-1β and complement 5a.
• Over one-third of selected antibody hits demonstrated binding to the target epitopes.
• Validation of the photocrosslinking approach for epitope-specific antibody selection.

Conclusions:

• The developed photocrosslinking method offers a feasible and versatile solution for epitope-directed antibody selection.
• This technique advances antibody discovery by enabling precise targeting of conformational epitopes.
• The method holds potential for applications in diagnostics and therapeutics requiring specific antibody interactions.