Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Carboxy-Terminal Region of a Thermostable CITase from Thermoanaerobacter thermocopriae Has the Ability to Produce Long Isomaltooligosaccharides

  • Jeong, Woo Soo (Department of Agro-Food Resources, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Kim, Yu-Ri (Department of Food Science and Technology, Chonnam National University) ;
  • Hong, Seong-Jin (Department of Food Science and Technology, Chonnam National University) ;
  • Choi, Su-Jeong (Department of Food Science and Technology, Chonnam National University) ;
  • Choi, Ji-Ho (Department of Agro-Food Resources, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Park, Shin-Young (Department of Agro-Food Resources, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Woo, Eui-Jeon (Korea Research Institute of Bioscience & Biotechnology (KRIBB)) ;
  • Kim, Young Min (Department of Food Science and Technology, Chonnam National University) ;
  • Park, Bo-Ram (Department of Agro-Food Resources, National Institute of Agricultural Sciences, Rural Development Administration)
  • Received : 2019.10.13
  • Accepted : 2019.11.26
  • Published : 2019.12.28
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Abstract

Isomaltooligosaccharides (IMOs) have good prebiotic effects, and long IMOs (LIMOs) with a degree of polymerization (DP) of 7 or above show improved effects. However, they are not yet commercially available, and require costly enzymes and processes for production. The N-terminal region of the thermostable Thermoanaerobacter thermocopriae cycloisomaltooligosaccharide glucanotransferase (TtCITase) shows cyclic isomaltooligosaccharide (CI)-producing activity owing to a catalytic domain of glycoside hydrolase (GH) family 66 and carbohydrate-binding module (CBM) 35. In the present study, we elucidated the activity of the C-terminal region of TtCITase (TtCITase-C; Met740-Phe1,559), including a CBM35-like region and the GH family 15 domain. The domain was successfully cloned, expressed, and purified as a single protein with a molecular mass of 115 kDa. TtCITase-C exhibited optimal activity at 40℃ and pH 5.5, and retained 100% activity at pH 5.5 after 18-h incubation. TtCITase-C synthesized α-1,6 glucosyl products with over seven degrees of polymerization (DP) by an α-1,6 glucosyl transfer reaction from maltopentaose, isomaltopentaose, or commercialized maltodextrins as substrates. These results indicate that TtCITase-C could be used for the production of α-1,6 glucosyl oligosaccharides with over DP7 (LIMOs) in a more cost-effective manner, without requiring cyclodextran.

Keywords

References

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