title: Cu,Zn superoxide dismutase is a peroxisomal enzyme in human fibroblasts and hepatoma cells.
abstract: The intracellular localization of Cu,Zn superoxide dismutase (superoxide:superoxide oxidoreductase, EC 1.15.1.1) has been examined by immunofluorescence using four monoclonal anti-Cu,Zn superoxide dismutase antibodies raised against a recombinant human Cu,Zn superoxide dismutase derivative produced and purified from Escherichia coli. Colocalization with catalase, a peroxisomal matrix enzyme, was used to demonstrate the peroxisomal localization of Cu,Zn superoxide dismutase in human fibroblasts and hepatoma cells. In the fibroblasts of Zellweger syndrome patients, the enzyme is not transported to the peroxisomal ghosts but, like catalase, remains in the cytoplasm. In addition, immunocryoelectron microscopy of yeast cells expressing human Cu,Zn superoxide dismutase showed that the enzyme is translocated to the peroxisomes.
authors.affiliation: Genentech Inc., South San Francisco, CA 94080.
authors.forename: G A
authors.initials: GA
authors.lastname: Keller
authors.forename: T G
authors.initials: TG
authors.lastname: Warner
authors.forename: K S
authors.initials: KS
authors.lastname: Steimer
authors.forename: R A
authors.initials: RA
authors.lastname: Hallewell
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal; D006528:Carcinoma, Hepatocellular / Q000201:enzymology; D005347:Fibroblasts / Q000201:enzymology / Q000648:ultrastructure; D005455:Fluorescent Antibody Technique; D006801:Humans; D008113:Liver Neoplasms / Q000201:enzymology; D051379:Mice; D008807:Mice, Inbred BALB C / Q000276:immunology; D008830:Microbodies / Q000201:enzymology* / Q000648:ultrastructure; D016253:Microscopy, Immunoelectron; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000032:analysis / Q000276:immunology; D012441:Saccharomyces cerevisiae / Q000235:genetics; D013482:Superoxide Dismutase / Q000032:analysis* / Q000276:immunology; D015211:Zellweger Syndrome / Q000201:enzymology / Q000473:pathology
chemical_list: D000911:Antibodies, Monoclonal; D011994:Recombinant Proteins; D013482:Superoxide Dismutase