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Synthesis of β-Galactooligosaccharide Using Bifidobacterial β-Galactosidase Purified from Recombinant Escherichia coli

  • Oh, So Young (Department of Food and Nutrition, Research Institute of Human Ecology, Seoul National University) ;
  • Youn, So Youn (Department of Food and Nutrition, Research Institute of Human Ecology, Seoul National University) ;
  • Park, Myung Soo (Research Center, BIFIDO Co. Ltd.) ;
  • Kim, Hyoung-Geun (Graduate School of Biotechnology and Oriental Medicine Biotechnology, Kyung Hee University) ;
  • Baek, Nam-In (Graduate School of Biotechnology and Oriental Medicine Biotechnology, Kyung Hee University) ;
  • Li, Zhipeng (Department of Food and Nutrition, Research Institute of Human Ecology, Seoul National University) ;
  • Ji, Geun Eog (Department of Food and Nutrition, Research Institute of Human Ecology, Seoul National University)
  • 투고 : 2017.02.23
  • 심사 : 2017.05.21
  • 발행 : 2017.08.28

초록

Galactooligosaccharides (GOSs) are known to be selectively utilized by Bifidobacterium, which can bring about healthy changes of the composition of intestinal microflora. In this study, ${\beta}-GOS$ were synthesized using bifidobacterial ${\beta}-galactosidase$ (G1) purified from recombinant E. coli with a high GOS yield and with high productivity and enhanced bifidogenic activity. The purified recombinant G1 showed maximum production of ${\beta}-GOSs$ at pH 8.5 and $45^{\circ}C$. A matrix-assisted laser desorption ionization time-of-flight mass spectrometry analysis of the major peaks of the produced ${\beta}-GOSs$ showed MW of 527 and 689, indicating the synthesis of ${\beta}-GOSs$ at degrees of polymerization (DP) of 3 and DP4, respectively. The trisaccharides were identified as ${\beta}-{\text\tiny{D}}$-galactopyranosyl-($1{\rightarrow}4$)-O-${\beta}-{\text\tiny{D}}$-galactopyranosyl-($1{\rightarrow}4$)-O-${\beta}-{\text\tiny{D}}$-glucopyranose, and the tetrasaccharides were identified as ${\beta}-{\text\tiny{D}}$-galactopyranosyl-($1{\rightarrow}4$)-O-${\beta}-{\text\tiny{D}}$-galactopyranosyl-($1{\rightarrow}4$)-O-${\beta}-{\text\tiny{D}}$-galactopyranosyl-($1{\rightarrow}4$)-O-${\beta}-{\text\tiny{D}}$-glucopyranose. The maximal production yield of GOSs was as high as 25.3% (w/v) using purified recombinant ${\beta}-galactosidase$ and 36% (w/v) of lactose as a substrate at pH 8.5 and $45^{\circ}C$. After 140 min of the reaction under this condition, 268.3 g/l of GOSs was obtained. With regard to the prebiotic effect, all of the tested Bifidobacterium except for B. breve grew well in BHI medium containing ${\beta}-GOS$ as a sole carbon source, whereas lactobacilli and Streptococcus thermophilus scarcely grew in the same medium. Only Bacteroides fragilis, Clostridium ramosum, and Enterobacter cloacae among the 17 pathogens tested grew in BHI medium containing ${\beta}-GOS$ as a sole carbon source; the remaining pathogens did not grow in the same medium. Consequently, the ${\beta}-GOS$ are expected to contribute to the beneficial change of intestinal microbial flora.

키워드

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