title: Heme content of recombinant catalase from Psychrobacter sp. T-3 altered by host Escherichia coli cell growth conditions.
abstract: The catalase gene of Psychrobacter sp. T-3 was cloned, and the gene product (PktA) was overexpressed in Escherichia coli. The specific activity of the purified PktA was slightly lower than that of the native purified enzyme obtained from Psychrobacter sp. T-3. Spectrophotometric measurements of the purified enzymes suggested that the recombinant PktA contains a mixture of heme b and d, although the native enzyme contains the sole heme b. An addition of the heme precursor 5-aminolevulinic acid (ALA) to the medium increased the heme b content of the recombinant PktA, and the resulting enzyme showed higher specific activity than the native enzyme. This is the first report that shows the heme content of overproduced catalase altered by the host cell growth conditions.
authors.affiliation: Department of Bioscience and Technology, School of Engineering, Hokkaido Tokai University, Minaminosawa, Minami-ku, Sapporo 005-8601, Japan.
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Kimoto
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Matsuyama
authors.forename: Isao
authors.initials: I
authors.lastname: Yumoto
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Yoshimune
mesh_terms: D001426:Bacterial Proteins / Q000096:biosynthesis / Q000737:chemistry* / Q000302:isolation & purification; D002374:Catalase / Q000096:biosynthesis / Q000737:chemistry* / Q000302:isolation & purification; D018929:Cell Culture Techniques; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000235:genetics / Q000254:growth & development*; D006418:Heme / Q000032:analysis* / Q000096:biosynthesis / Q000302:isolation & purification; D044096:Psychrobacter / Q000201:enzymology* / Q000235:genetics; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D001426:Bacterial Proteins; D011994:Recombinant Proteins; D006418:Heme; D002374:Catalase