title: Purification of cytochrome b5 from pig testis microsomes by isoelectric focusing in an immobiline pH gradient.
abstract: Testicular cytochrome b5 was purified by a procedure including preparative isoelectrofocusing. The cytochrome b5 was determined to have an isoelectric point of 4.45 on analytical isoelectric focusing. The purified cytochrome b5 was found to be homogeneous and its molecular weight was estimated to be 16,000 on polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate. The oxidized and reduced forms of the purified preparation exhibited absorption spectra of a typical cytochrome b5. A 69-fold purification was achieved with an overall yield of 6.2%. Following preparation of the microsomes, the purification is accomplished by a two-step procedure utilizing column chromatography and preparative isoelectric focusing.
authors.affiliation: School of Medicine, School of Medicine, Kitasato University, 1-15-1 Kitasato, Sagamihara, Kanagawa, 228, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kuwada
authors.forename: H
authors.initials: H
authors.lastname: Hasumi
authors.forename: Y
authors.initials: Y
authors.lastname: Furuse
mesh_terms: D000178:Acrylamides / Q000737:chemistry; D000818:Animals; D015786:Cytochromes b5 / Q000737:chemistry / Q000302:isolation & purification*; D004591:Electrophoresis, Polyacrylamide Gel; D006863:Hydrogen-Ion Concentration; D007525:Isoelectric Focusing / Q000379:methods*; D008297:Male; D008861:Microsomes / Q000201:enzymology*; D013552:Swine; D013737:Testis / Q000201:enzymology*
chemical_list: D000178:Acrylamides; C059413:Immobiline; D015786:Cytochromes b5