title: An efficient and optimized purification procedure for the superoxide dismutase from Aspergillus niger. Partial characterization of the purified enzyme.
abstract: Cu,Zn-superoxide dismutase was isolated from Aspergillus niger mycelia, harvested at the mid-logarithmic growth phase. The purification scheme aimed at the optimization of the ethanol/chloroform extraction (Tsuchihashi extraction) through response surface methodology. Upon optimum extraction conditions, it was possible to obtain electrophoretically pure enzyme preparations, by the application of one step anion exchange chromatography. The enzyme yield of this simple purification procedure was above 75% while the specific activity of the final preparation was among the highest reported for eucariotic microorganisms. The purified enzyme exhibited similar physicochemical characteristics with other Aspergillus sp. superoxide dismutases revealing an apparent tetrameric structure with a subunit molecular weight of 19 kDa, and a pl of 5.95.
authors.affiliation: Department of Chemical Engineering, National Technical University of Athens, Zografou, Greece.
authors.forename: D G
authors.initials: DG
authors.lastname: Hatzinikolaou
authors.forename: C
authors.initials: C
authors.lastname: Tsoukia
authors.forename: D
authors.initials: D
authors.lastname: Kekos
authors.forename: B J
authors.initials: BJ
authors.lastname: Macris
mesh_terms: D001234:Aspergillus niger / Q000201:enzymology* / Q000254:growth & development; D001709:Biotechnology; D002725:Chloroform; D002852:Chromatography, Ion Exchange; D004795:Enzyme Stability; D000431:Ethanol; D007526:Isoelectric Point; D008970:Molecular Weight; D011487:Protein Conformation; D013482:Superoxide Dismutase / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism
chemical_list: D000431:Ethanol; D002725:Chloroform; D013482:Superoxide Dismutase