title: Comparative study on recombinant chloroplastic and cytosolic ascorbate peroxidase isozymes of spinach.
abstract: The spinach stromal, thylakoid-bound, and cytosolic ascorbate peroxidase isozymes (EC 1.11.1.11) were overexpressed in Escherichia coli, and their enzymatic properties were compared with the respective native isozymes. The purification of the recombinant stromal and cytosolic ascorbate peroxidases using the conventional column chromatography yielded 0.73 and 2.2 mg of protein/liter of bacteria culture with enzyme activities of 800 and 486 micromol min-1 mg protein-1, respectively. In every respect, the recombinant stromal, thylakoid-bound, and cytosolic ascorbate peroxidase isozymes exhibited identical enzymatic properties with each native isozyme. Specifically, the recombinant stromal and thylakoid-bound ascorbate peroxidase isozymes showed high utilization of ascorbate as an electron donor and had a very short lifetime in ascorbate-depleted medium. Polyclonal antibodies raised against both purified recombinant stromal and cytosolic ascorbate peroxidase isozymes were prepared. Both antibodies showed a cross-reaction with the recombinant and native ascorbate peroxidase isozymes.
authors.affiliation: Faculty of Agriculture, Kinki University, 3327-204 Nakamachi, Nara, 631-8505, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yoshimura
authors.forename: T
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Y
authors.initials: Y
authors.lastname: Nakamura
authors.forename: M
authors.initials: M
authors.lastname: Tamoi
authors.forename: T
authors.initials: T
authors.lastname: Takeda
authors.forename: T
authors.initials: T
authors.lastname: Tada
authors.forename: K
authors.initials: K
authors.lastname: Nishimura
authors.forename: S
authors.initials: S
authors.lastname: Shigeoka
mesh_terms: D000595:Amino Acid Sequence; D060387:Ascorbate Peroxidases; D001483:Base Sequence; D002736:Chloroplasts / Q000201:enzymology*; D002850:Chromatography, Gel; D003001:Cloning, Molecular; D018548:Cotyledon; D003600:Cytosol / Q000201:enzymology; D017931:DNA Primers; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli; D007527:Isoenzymes / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D007700:Kinetics; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010544:Peroxidases / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D011994:Recombinant Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D018724:Spinacia oleracea / Q000201:enzymology*
chemical_list: D017931:DNA Primers; D007527:Isoenzymes; D011994:Recombinant Proteins; D010544:Peroxidases; D060387:Ascorbate Peroxidases