title: Enhanced antibody affinity to Japanese encephalitis virus E protein by phage display.
abstract: Obtaining antibodies with high affinity and specificity against antigens are required for the development of therapeutic and diagnostic antibodies. In this study, the contributions to binding affinity in the CDR2 and CDR3 regions of two monoclonal antibodies E3.3 and 2H2 were investigated by random mutagenesis in a phage-display synthetic oligonucleotide library. One high-affinity clone (CDR3-30) was obtained with a 3-fold increase of the dissociation constant, resulting from the changes in amino acids at residues 95, 97, and 98 in the CDRH3 region. Analysis of the predicted structure by modeling suggested that the contributions of mutated residues in the CDR3 region to the binding affinity involved not only complementarity between antigen and CDR3, but also interaction between heavy and light chains. The information gained from this study may benefit the design of vaccines and therapeutic antibodies against Japanese encephalitis virus infection.
authors.affiliation: Institute of Biotechnology, Department of Life Science, National Tsing-Hua University, Hsinchu 30013, Taiwan.
authors.forename: Willy W L
authors.initials: WW
authors.lastname: Hong
authors.forename: Ya-Huang
authors.initials: YH
authors.lastname: Yen
authors.forename: Suh-Chin
authors.initials: SC
authors.lastname: Wu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000737:chemistry / Q000235:genetics / Q000276:immunology; D000915:Antibody Affinity; D016466:CHO Cells; D022801:Complementarity Determining Regions / Q000737:chemistry / Q000235:genetics / Q000276:immunology; D006224:Cricetinae; D003412:Cricetulus; D004664:Encephalitis Virus, Japanese / Q000235:genetics / Q000276:immunology*; D007140:Immunoglobulin Fab Fragments / Q000737:chemistry / Q000235:genetics / Q000276:immunology; D007074:Immunoglobulin G / Q000737:chemistry / Q000235:genetics / Q000276:immunology; D008958:Models, Molecular; D008969:Molecular Sequence Data; D016296:Mutagenesis; D019151:Peptide Library; D017434:Protein Structure, Tertiary; D011994:Recombinant Proteins / Q000737:chemistry / Q000276:immunology; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D014759:Viral Envelope Proteins / Q000737:chemistry / Q000235:genetics / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D022801:Complementarity Determining Regions; D007140:Immunoglobulin Fab Fragments; D007074:Immunoglobulin G; D019151:Peptide Library; D011994:Recombinant Proteins; D014759:Viral Envelope Proteins