title: Enzymatic defenses against oxygen toxicity in the hydrothermal vent animals Riftia pachyptila and Calyptogena magnifica.
abstract: Two deep-sea hydrothermal vent organisms, the tube worm Riftia pachyptila and the clam Calyptogena magnifica, contain superoxide dismutase, dianisidine peroxidase, and glutathione peroxidase. The tube worm trophosome exhibits an iron-containing superoxide dismutase, ordinarily associated with prokaryotes and not previously seen in an animal tissue, in accord with the presence of symbiotic bacteria in this tissue. The enzymes which provide a defense against oxygen toxicity are thus present in these animals.
mesh_terms: D000818:Animals; D000845:Annelida / Q000201:enzymology*; D049872:Bivalvia / Q000201:enzymology*; D002374:Catalase / Q000502:physiology; D005609:Free Radicals; D005880:Gills / Q000201:enzymology; D005979:Glutathione Peroxidase / Q000502:physiology; D009132:Muscles / Q000201:enzymology; D010100:Oxygen / Q000633:toxicity*; D010544:Peroxidases / Q000502:physiology; D013482:Superoxide Dismutase / Q000502:physiology
chemical_list: D005609:Free Radicals; D010544:Peroxidases; C020033:dianisidine peroxidase; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D010100:Oxygen