title: Construction of phosphorylatable monoclonal antibody to a tumor-associated antigen.
abstract: A phosphorylation site was introduced into chimeric monoclonal antibody B72.3 (MAb-chB72.3) by site-specific mutation of the coding sequence. The phosphorylation site for the cAMP-dependent protein kinase was positioned at the carboxyl terminus of the heavy-chain constant region of MAb-chB72.3. The resultant modified MAb-chB72.3-P was expressed in 293 cells and purified. The MAb-chB72.3-P protein was phosphorylated by the catalytic subunit of cAMP-dependent protein kinase with [gamma-32P]ATP to high radiospecific activity. The 32P-labeled MAb-chB72.3-P protein bound to cells expressing the tumor-associated glycoprotein 72 antigen. The introduction of phosphorylation sites into MAbs provides a new type of MAb for the diagnosis and treatment of cancers.
authors.affiliation: Department of Molecular Genetics and Microbiology, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, Piscataway 08854-5635, USA.
authors.forename: L
authors.initials: L
authors.lastname: Lin
authors.forename: B
authors.initials: B
authors.lastname: Daugherty
authors.forename: J
authors.initials: J
authors.lastname: Schlom
authors.forename: S
authors.initials: S
authors.lastname: Pestka
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis / Q000378:metabolism*; D000912:Antibodies, Neoplasm / Q000096:biosynthesis / Q000378:metabolism*; D000951:Antigens, Neoplasm / Q000276:immunology*; D001483:Base Sequence; D001943:Breast Neoplasms / Q000276:immunology*; D002460:Cell Line; D017868:Cyclic AMP-Dependent Protein Kinases / Q000378:metabolism*; D017931:DNA Primers; D005260:Female; D006023:Glycoproteins / Q000276:immunology*; D016325:HIV Long Terminal Repeat; D015497:HIV-1 / Q000235:genetics; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000096:biosynthesis / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D010766:Phosphorylation; D016133:Polymerase Chain Reaction; D011401:Promoter Regions, Genetic; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000378:metabolism*; D014162:Transfection
chemical_list: D000911:Antibodies, Monoclonal; D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D017931:DNA Primers; D006023:Glycoproteins; D007143:Immunoglobulin Heavy Chains; D011993:Recombinant Fusion Proteins; C047052:tumor-associated antigen 72; D017868:Cyclic AMP-Dependent Protein Kinases