Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Galactooligosaccharide Synthesis by Active ${\beta}$-Galactosidase Inclusion Bodies-Containing Escherichia coli Cells

  • Lee, Sang-Eun (Department of Biotechnology, Chungju National University) ;
  • Seo, Hyeon-Beom (Department of Biotechnology, Chungju National University) ;
  • Kim, Hye-Ji (Department of Biotechnology, Chungju National University) ;
  • Yeon, Ji-Hyeon (Department of Biotechnology, Chungju National University) ;
  • Jung, Kyung-Hwan (Department of Biotechnology, Chungju National University)
  • Received : 2011.05.13
  • Accepted : 2011.07.23
  • Published : 2011.11.28
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Abstract

In this study, a galactooligosaccharide (GOS) was synthesized using active ${\beta}$-galactosidase (${\beta}$-gal) inclusion bodies (IBs)-containing Escherichia coli (E. coli) cells. Analysis by MALDI-TOF (matrix-assisted laser desorption/ionization-time of flight) mass spectrometry revealed that a trisaccharide was the major constituent of the synthesized GOS mixture. Additionally, the optimal pH, lactose concentration, amounts of E. coli ${\beta}$-gal IBs, and temperature for GOS synthesis were 7.5, 500 g/l, 3.2 U/ml, and $37^{\circ}C$, respectively. The total GOS yield from 500 g/l of lactose under these optimal conditions was about 32%, which corresponded to 160.4 g/l of GOS. Western blot analyses revealed that ${\beta}$-gal IBs were gradually destroyed during the reaction. In addition, when both the reaction mixture and E. coli ${\beta}$-gal hydrolysate were analyzed by high-performance thin-layer chromatography (HP-TLC), the trisaccharide was determined to be galactosyl lactose, indicating that a galactose moiety was most likely transferred to a lactose molecule during GOS synthesis. This GOS synthesis system might be useful for the synthesis of galactosylated drugs, which have recently received significant attention owing to the ability of the galactose molecules to improve the drugs solubility while decreasing their toxicity. ${\beta}$-Gal IB utilization is potentially a more convenient and economic approach to enzymatic GOS synthesis, since no enzyme purification steps after the transgalactosylation reaction would be required.

Keywords

References

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