Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Cloning, Analysis, and Expression of the Gene for Thermostable Polyphosphate Kinase of Thermus caldophilus GK24 and Properties of the Recombinant Enzyme

  • Hoe, Hyang-Sook (Department of Genetic Engineering, Sungkyunkwan University) ;
  • Lee, Sung-Kyoung (Korea Research Institute of Bioscience and Biothechnology) ;
  • Lee, Dae-Sil (Department of Genetic Engineering, Sungkyunkwan University) ;
  • Kwon, Suk-Tae (Department of Genetic Engineering, Sungkyunkwan University)
  • Published : 2003.02.01
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Abstract

The gene encoding Thermus caldophilus GK24 polyphosphate kinase (Tca PPK) was cloned and sequenced. The gene contains an open reading frame encoding 608 amino acids with a calculated molecular mass of 69,850 Da. The deduced amino acid sequence of Tca PPK showed a 40% homology to Escherichia coli PPK, and $39\%$ to Klebsiella aerogenes PPK. The Tca ppk gene was expressed under the control of the T7lac promoter on pET-22b(+) in E. coli and its enzyme was purified about 70-fold with $36\%$ yield, following heating and HiTrap chelating HP column chromatography. The native enzyme was found to have an approximate molecular mass of 580,000 Da and consisted of eight subunits. The optimum pH and temperature of the enzyme were 5.5 and $70^{\circ}C$, respectively. A divalent cation was required for the enzyme activity, with $Mg^2+$ being the most effective.

Keywords

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