title: Variants of the antibody herceptin that interact with HER2 and VEGF at the antigen binding site.
abstract: The interface between antibody and antigen is often depicted as a lock and key, suggesting that an antibody surface can accommodate only one antigen. Here, we describe an antibody with an antigen binding site that binds two distinct proteins with high affinity. We isolated a variant of Herceptin, a therapeutic monoclonal antibody that binds the human epidermal growth factor receptor 2 (HER2), on the basis of its ability to simultaneously interact with vascular endothelial growth factor (VEGF). Crystallographic and mutagenesis studies revealed that distinct amino acids of this antibody, called bH1, engage HER2 and VEGF energetically, but there is extensive overlap between the antibody surface areas contacting the two antigens. An affinity-improved version of bH1 inhibits both HER2- and VEGF-mediated cell proliferation in vitro and tumor progression in mouse models. Such "two-in-one" antibodies challenge the monoclonal antibody paradigm of one binding site, one antigen. They could also provide new opportunities for antibody-based therapy.
authors.affiliation: Department of Protein Engineering, Genentech, 1 DNA Way, South San Francisco, CA 94080, USA.
authors.forename: Jenny
authors.initials: J
authors.lastname: Bostrom
authors.forename: Shang-Fan
authors.initials: SF
authors.lastname: Yu
authors.forename: David
authors.initials: D
authors.lastname: Kan
authors.forename: Brent A
authors.initials: BA
authors.lastname: Appleton
authors.forename: Chingwei V
authors.initials: CV
authors.lastname: Lee
authors.forename: Karen
authors.initials: K
authors.lastname: Billeci
authors.forename: Wenyan
authors.initials: W
authors.lastname: Man
authors.forename: Franklin
authors.initials: F
authors.lastname: Peale
authors.forename: Sarajane
authors.initials: S
authors.lastname: Ross
authors.forename: Christian
authors.initials: C
authors.lastname: Wiesmann
authors.forename: Germaine
authors.initials: G
authors.lastname: Fuh
mesh_terms: D000818:Animals; D018033:Antibodies, Bispecific / Q000737:chemistry / Q000235:genetics / Q000276:immunology* / Q000627:therapeutic use; D000911:Antibodies, Monoclonal / Q000737:chemistry / Q000235:genetics / Q000276:immunology* / Q000627:therapeutic use; D061067:Antibodies, Monoclonal, Humanized; D000915:Antibody Affinity; D000918:Antibody Specificity; D001666:Binding Sites, Antibody / Q000235:genetics; D049109:Cell Proliferation / Q000187:drug effects; D022801:Complementarity Determining Regions / Q000235:genetics / Q000276:immunology; D018360:Crystallography, X-Ray; D000939:Epitopes / Q000276:immunology / Q000378:metabolism; D005818:Genetic Engineering; D006801:Humans; D051379:Mice; D008958:Models, Molecular; D016296:Mutagenesis; D009374:Neoplasms, Experimental / Q000188:drug therapy; D011487:Protein Conformation; D017434:Protein Structure, Tertiary; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000737:chemistry / Q000276:immunology* / Q000378:metabolism; D013816:Thermodynamics; D000068878:Trastuzumab; D042461:Vascular Endothelial Growth Factor A / Q000737:chemistry / Q000276:immunology* / Q000378:metabolism; D023041:Xenograft Model Antitumor Assays
chemical_list: D018033:Antibodies, Bispecific; D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D022801:Complementarity Determining Regions; D000939:Epitopes; D018719:Erb-b2 Receptor Tyrosine Kinases; D000068878:Trastuzumab; D042461:Vascular Endothelial Growth Factor A; C467484:VEGFA protein, human