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Isocitrate dehydrogenase isozymes from a psychrotrophic bacterium, Pseudomonas psychrophila

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Abstract

The genes encoding monomer- and dimer-type isocitrate dehydrogenase (IDH) isozymes from a psychrotrophic bacterium, Pseudomonas psychrophila, were cloned and sequenced. Open reading frames of the genes were 2,226 and 1,257 bp in length and corresponded to polypeptides composed of 741 and 418 amino acids, respectively. The deduced amino acid sequences showed high sequence identity with those of psychrophilic bacteria, Colwellia maris and Colwellia psychrerythraea, (about 70% identity) and the respective types of the putative IDH genes from other bacteria of genus Pseudomonas (more than 80% identity). The two genes were located in opposite direction from each other with a spacer of 463 bases in the order of dimeric and monomeric IDH genes on the chromosomal DNA, but analyses of northern blotting and 5′-terminal regions of the mRNAs revealed that they are transcribed independently. The expression of monomer- and dimer-type IDH genes in C. maris are known to be cold- and acetate-inducible, respectively, while only slight inductions by low temperature and/or acetate were observed in the expression of the P. psychrophila monomer- and dimer-type IDH genes. Both of these IDH isozymes overproduced in Escherichia coli showed mesophilic properties, in contrast with monomer- and dimer-type IDHs of C. maris as cold adapted and mesophilic enzymes, respectively. The substitution of Glu55 residue in the P. psychrophila monomeric IDH for Lys, which is the corresponding residue conserved between the cold-adapted monomeric IDHs from C. maris and C. psychrerythraea, by site-directed mutagenesis resulted in the decreased thermostability and the lowered optimum temperature of activity, suggesting that this residue is involved in the mesophilic properties of the P. psychrophila monomeric IDH.

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Authors and Affiliations

  1. Biosystems Science Course, Graduate School of Life Science, Hokkaido University, Kita 10-jo Nishi 8-chome, Kita-ku, Sapporo, 060-0810, Japan

    Shougo Matsuo & Haruna Shirai

  2. Division of Cellular Life Science, Faculty of Advanced Life Science, Hokkaido University, Kita 10-jo Nishi 8-chome, Kita-ku, Sapporo, 060-0810, Japan

    Yasuhiro Takada

Authors
  1. Shougo Matsuo
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  2. Haruna Shirai
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  3. Yasuhiro Takada
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Correspondence to Yasuhiro Takada.

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Communicated by Timothy Donohue.

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Matsuo, S., Shirai, H. & Takada, Y. Isocitrate dehydrogenase isozymes from a psychrotrophic bacterium, Pseudomonas psychrophila . Arch Microbiol 192, 639–650 (2010). https://doi.org/10.1007/s00203-010-0595-3

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