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Covalent antibody display--an in vitro antibody-DNA library selection system
Herald Reiersen1, Inger Løbersli, Geir Å Løset
1Affitech AS, Oslo Research Park Gaustadalleen 21, N-0349 OSLO, Norway. herald@affitech.com
Nucleic Acids Research
|January 18, 2005
Summary
Researchers developed a new in vitro display tool using bacteriophage P2A endonuclease and single-chain antibodies (scFvs). This covalent antibody display technology enables efficient selection of antibody fragments directly from DNA-protein complexes.
Area of Science:
- Biochemistry
- Molecular Biology
- Immunotechnology
Background:
- Bacteriophage P2A endonuclease initiates DNA replication via a covalent bond with its phosphate backbone.
- Antibody fragment display technologies are crucial for antibody discovery and engineering.
Purpose of the Study:
- To develop a novel in vitro display tool for antibody fragments using the P2A endonuclease.
- To establish a covalent antibody display system based exclusively on DNA-protein complexes.
Main Methods:
- Genetic fusion of P2A endonuclease with single-chain antibodies (scFvs).
- In vitro coupled transcription-translation of fusion proteins in Escherichia coli S30 lysate.
- Panning of scFv-P2A fusion protein-DNA complexes on immobilized antigen.
- Recovery and amplification of enriched DNA via PCR for iterative selection cycles.
Main Results:
- Demonstrated enrichment of scFvs from spiked libraries.
- Successfully selected specific anti-tetanus toxoid scFvs from a large human V-gene library (50 million members).
- Established a functional covalent antibody display system.
Conclusions:
- The P2A endonuclease can be effectively engineered as a display tool for antibody fragments.
- Covalent antibody display offers a powerful in vitro selection system based on DNA-protein complexes.
- This technology facilitates efficient antibody discovery and engineering.