title: Increasing stability of antibody via antibody engineering: stability engineering on an anti-hVEGF.
abstract: Antibody stability is very important for expression, activity, specificity, and storage. This knowledge of antibody structure has made it possible for a computer-aided molecule design to be used to optimize and increase antibody stability. Many computational methods have been built based on knowledge or structure, however, a good integrated engineering system has yet to be developed that combines these methods. In the current study, we designed an integrated computer-aided engineering protocol, which included several successful methods. Mutants were designed considering factors that affected stability and multiwall filter screening was used to improve the design accuracy. Using this protocol, the thermo-stability of an anti-hVEGF antibody was significantly improved. Nearly 40% of the single-point mutants proved to be more stable than the parent antibody and most of the mutations could be stacked effectively. The T₅₀ also improved about 7°C by combinational mutation of seven sites in the light chain and three sites in the heavy chain. Data indicate that the protocol is an effective method for optimization of antibody structure, especially for improving thermo-stability. This protocol could also be used to enhance the stability of other antibodies.
authors.affiliation: Laboratory of Protein Engineering, Beijing Institute of Biotechnology, Beijing, China.
authors.forename: Shuang
authors.initials: S
authors.lastname: Wang
authors.forename: Ming
authors.initials: M
authors.lastname: Liu
authors.forename: Dadi
authors.initials: D
authors.lastname: Zeng
authors.forename: Weiyi
authors.initials: W
authors.lastname: Qiu
authors.forename: Pingping
authors.initials: P
authors.lastname: Ma
authors.forename: Yunzhou
authors.initials: Y
authors.lastname: Yu
authors.forename: Hongyan
authors.initials: H
authors.lastname: Chang
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Sun
mesh_terms: D019943:Amino Acid Substitution; D000911:Antibodies, Monoclonal / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D000918:Antibody Specificity; D017076:Computer-Aided Design; D006358:Hot Temperature / Q000009:adverse effects; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D007147:Immunoglobulin Light Chains / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D008958:Models, Molecular; D062105:Molecular Docking Simulation; D016297:Mutagenesis, Site-Directed; D017354:Point Mutation; D011487:Protein Conformation; D015202:Protein Engineering / Q000379:methods*; D055550:Protein Stability; D058767:Protein Unfolding; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D042461:Vascular Endothelial Growth Factor A / Q000037:antagonists & inhibitors* / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D007143:Immunoglobulin Heavy Chains; D007147:Immunoglobulin Light Chains; D011994:Recombinant Proteins; C467484:VEGFA protein, human; D042461:Vascular Endothelial Growth Factor A
keywords: antibody mutant; computer-aided; molecule design; structure optimization; thermo-stability