title: A novel a-type terminal oxidase from Sulfolobus acidocaldarius with cytochrome c oxidase activity.
abstract: Cytochrome C oxidase was solubilized with a nonionic detergent n-decanoyl-N-methyl glucamide from the membranes of Sulfolobus acidocaldarius, a thermoacidophilic archaebacterium, and was purified. The enzyme oxidized horse heart cytochrome C with a Vmax of 63 mumols/min/mg at 50 degrees C. The activity was sensitive to cyanide. The enzyme also catalyzed oxygen uptake detergent on N, N, N', N'-tetramethyl p-phenylene diamine. An apparent molecular mass was estimated to be 150 kDa. The enzyme is composed of three subunits of 37, 23 and 14 kDa. Spectral characteristics were similar to typical bacterial aa3 except for the presence of a novel 583 nm peak observed in reduced minus oxidized difference spectrum.
authors.affiliation: Department of Life Science, Tokyo Institute of Technology, Yokohama, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Wakagi
authors.forename: T
authors.initials: T
authors.lastname: Yamauchi
authors.forename: T
authors.initials: T
authors.lastname: Oshima
authors.forename: M
authors.initials: M
authors.lastname: Müller
authors.forename: A
authors.initials: A
authors.lastname: Azzi
authors.forename: N
authors.initials: N
authors.lastname: Sone
mesh_terms: D001105:Archaea / Q000201:enzymology*; D001419:Bacteria / Q000201:enzymology*; D002462:Cell Membrane / Q000201:enzymology; D002845:Chromatography; D003486:Cyanides / Q000494:pharmacology; D003574:Cytochrome c Group / Q000378:metabolism; D003902:Detergents; D003576:Electron Transport Complex IV / Q000037:antagonists & inhibitors / Q000302:isolation & purification / Q000378:metabolism*; D005227:Fatty Acids; D005944:Glucosamine / Q000031:analogs & derivatives; D007700:Kinetics; D046911:Macromolecular Substances; D008970:Molecular Weight; D010084:Oxidation-Reduction; D013053:Spectrophotometry
chemical_list: D003486:Cyanides; D003574:Cytochrome c Group; D003902:Detergents; D005227:Fatty Acids; D046911:Macromolecular Substances; C042221:decanoyl-N-methylglucamide; D003576:Electron Transport Complex IV; D005944:Glucosamine