title: Monoclonal antibodies to the human multicatalytic proteinase (proteasome).
abstract: Multicatalytic proteinase is an intracellular enzyme composed of at least 12 different subunits. Seven murine hybridoma cell lines secreting antibodies to human multicatalytic proteinase (MCP) were established. The antibodies reacted with 4 different subunits of the oligomeric protein. Three of the antibodies bound to identical or closely spaced epitopes on the largest subunit, as shown by binding competition. Some of the antibodies cross-reacted with MCP from rat or rabbit, but none with lobster MCP. Glycoprotein components could not be detected in human MCP. The monoclonal antibodies and two polyclonal rabbit antibodies did not specifically inhibit the enzymatic activity of human MCP. Electrophoretic analysis of MCP immunoprecipitated from human placenta, liver, kidney, or HeLa cell extracts with antibodies to 3 different subunits suggested that the subunit compositions are very similar or identical.
authors.affiliation: August Krogh Institute, University of Copenhagen, Denmark.
authors.forename: M B
authors.initials: MB
authors.lastname: Kaltoft
authors.forename: C
authors.initials: C
authors.lastname: Koch
authors.forename: W
authors.initials: W
authors.lastname: Uerkvitz
authors.forename: K B
authors.initials: KB
authors.lastname: Hendil
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000918:Antibody Specificity; D001667:Binding, Competitive; D003429:Cross Reactions; D003546:Cysteine Endopeptidases / Q000737:chemistry / Q000276:immunology* / Q000302:isolation & purification; D000939:Epitopes; D006801:Humans; D006825:Hybridomas / Q000276:immunology; D051379:Mice; D009097:Multienzyme Complexes / Q000737:chemistry / Q000276:immunology* / Q000302:isolation & purification; D046988:Proteasome Endopeptidase Complex; D011487:Protein Conformation; D013045:Species Specificity
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D009097:Multienzyme Complexes; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex