| Title | Affinity Maturation of an Anti-Hepatitis B Virus PreS1 Humanized Antibody by Phage Display |
|---|---|
| Author | Gi-Hyeok Yang, Sun Ok Yoon, Myung Hee Jang, and Hyo Jeong Hong* |
| Address | Therapeutic Antibody Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejon 305-333, Republic of Korea |
| Bibliography | Journal of Microbiology, 45(6),528-533, 2007, |
| DOI | |
| Key Words | humanized antibody, phage display, random mutagenesis, HCDR3, affinity maturation, hepatitis B virus, preS1 |
| Abstract | In a previous study we generated an anti-Hepatitis B Virus (HBV) preS1 humanized antibody (HzKR127) that showed in vivo HBV-neutralizing activity in chimpanzees. However, the antigen-binding affinity of the humanized antibody may not be sufficient for clinical use and thus affinity maturation is required for better therapeutic efficacy. In this study, phage display technique was employed to increase the affinity of HzKR127. All six amino acid residues (Glu95-Tyr96-Asp97-Glu98-Ala99-Tyr100) in the heavy (H) chain complementarydetermining region 3 (HCDR3) of HzKR127 were randomized and phage-displayed single chain Fv (scFv) library was constructed. After three rounds of panning, 12 different clones exhibiting higher antigen-binding activity than the wild type ScFv were selected and their antigen-binding specificity for the preS1 confirmed. Subsequently, five ScFv clones were converted to whole IgG and subjected to affinity determination. The results showed that two clones (B3 and A19) exhibited an approximately 6 fold higher affinities than that of HzKR127. The affinity-matured humanized antibodies may be useful in anti-HBV immunotherapy. |
| Download PDF | 45(6)_09.pdf |