title: Two-step purification of cytochrome P-450 from adult pig testis by isoelectric focusing.
abstract: Adult testicular cytochrome P-450 was purified by a two-step procedure utilizing preparative isoelectrofocusing. Purification was achieved 1132 times with a yield of 4.82%. 17alpha-hydroxylase activity was shown to be 14.5 nmol of product/min/nmol of P-450. The cytochrome P-450 was determined to have an isoelectric point of 6.45 on analytical isoelectric focusing. The purified cytochrome P-450 was found to be homogeneous and its molecular weight was estimated to be 52000 on polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate. The carbon monoxide difference spectrum with a peak at 448 nm exhibited the absorption spectrum of a typical cytochrome P-450.
authors.affiliation: Department of Biochemistry, School of Medicine Kitasato University Kanagawa 228, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kuwada
authors.forename: J
authors.initials: J
authors.lastname: Maki
authors.forename: H
authors.initials: H
authors.lastname: Hasumi
mesh_terms: D000818:Animals; D000837:Anion Exchange Resins; D002852:Chromatography, Ion Exchange; D003577:Cytochrome P-450 Enzyme System / Q000302:isolation & purification*; D004591:Electrophoresis, Polyacrylamide Gel; D006863:Hydrogen-Ion Concentration; D007525:Isoelectric Focusing / Q000379:methods*; D007526:Isoelectric Point; D008297:Male; D008861:Microsomes / Q000201:enzymology; D008970:Molecular Weight; D013552:Swine; D013737:Testis / Q000201:enzymology*
chemical_list: D000837:Anion Exchange Resins; D003577:Cytochrome P-450 Enzyme System