title: Crystallographic studies and primary structure of the antitumor monoclonal CC49 Fab'.
abstract: The Fab' of CC49, a murine monoclonal antibody directed against the human tumor-associated antigen TAG-72 has been crystallized. The crystals are monoclinic, space group P(2)1 with cell parameters a = 115.6 A, b = 116.4 A, and c = 70.3 A; beta = 97.8 degrees. The size of the unit cell is compatible with four Fab' molecules in the asymmetric unit. The Fab molecules are related by two approximately perpendicular pseudo-2-fold axes. One pseudo-2-fold axis is parallel to the crystallographic 2-fold axis and was found by inspection of the Harker section of the native Patterson map; the other was found by a self rotation function. The primary structures of the variable regions of the CC49 antibody light and heavy chains have been determined and are compared with those of the related antitumor antibody B72.3.
authors.affiliation: Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892.
authors.forename: C
authors.initials: C
authors.lastname: Abergel
authors.forename: E A
authors.initials: EA
authors.lastname: Padlan
authors.forename: S V
authors.initials: SV
authors.lastname: Kashmiri
authors.forename: D
authors.initials: D
authors.lastname: Milenic
authors.forename: B
authors.initials: B
authors.lastname: Calvo
authors.forename: J
authors.initials: J
authors.lastname: Schlom
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D000951:Antigens, Neoplasm / Q000378:metabolism*; D003461:Crystallography; D004591:Electrophoresis, Polyacrylamide Gel; D006023:Glycoproteins / Q000378:metabolism*; D006801:Humans; D007140:Immunoglobulin Fab Fragments / Q000276:immunology* / Q000302:isolation & purification; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D011485:Protein Binding
chemical_list: D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D006023:Glycoproteins; D007140:Immunoglobulin Fab Fragments; C047052:tumor-associated antigen 72