High affinity ScFvs from a single rabbit immunized with multiple haptens

Area of Science:

• Biotechnology
• Immunology
• Molecular Biology

Background:

• Phage display is a powerful technique for antibody fragment discovery.
• Generating high-affinity binders against multiple targets from a single immunization can be challenging.

Purpose of the Study:

• To develop a method for producing multiple high-affinity single-chain variable fragments (scFvs) against diverse haptens from a single immunized animal.
• To evaluate the efficiency and specificity of phage display for generating scFvs against herbicides.

Main Methods:

• Immunization of a single rabbit with a mixture of four herbicide-hapten conjugates.
• Construction and screening of a single-chain Fv (scFv) phage display library.
• Isolation and characterization of high-affinity scFvs using k(off) ranking and affinity determination.

Main Results:

• Successfully generated scFvs with high affinities (sub-nanomolar range, lowest K(d) 6.75 x 10(-10) M) against four different herbicide haptens.
• Identified an anti-isoproturon scFv retaining binding activity at pH 1.7.
• Demonstrated the feasibility of producing multiple specific, high-affinity scFvs from a single animal and immunization.

Conclusions:

• A single immunization with multiple antigens combined with phage display is an effective strategy for generating diverse, high-affinity scFvs.
• The generated scFvs show potential for applications requiring specific herbicide detection and binding.
• The unusual pH stability of one scFv highlights the potential for discovering novel antibody characteristics.