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The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Bacterial Surface Display of Levansucrase of Zymomonas mobilis Using Bacillus Subtilis Spore Display System

고초균 포자를 이용한 Zymomonas mobilis 유래의 levansucrase 표면 발현

  • Kim, June-Hyung (Department of Chemical Engineering, Dong-A University) ;
  • Choi, Soo-Keun (Systems Microbiology Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Jung, Heung-Chae (Systems Microbiology Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Pan, Jae-Gu (Systems Microbiology Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Kim, Byung-Gee (School of Chemical Engineering, Seoul National University)
  • Received : 2011.05.09
  • Accepted : 2011.06.01
  • Published : 2011.06.30
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Abstract

Using Bacillus subtilis spore display system, with cotG as an anchoring motif, levansucrase from Zymomonas mobilis, was displayed on the outer surface of Bacillus subtilis spore. Flow cytometry of DB104 (pSDJH-cotG-levU) spore, proved the surface localization of CotG-LevU fusion protein on the spore compared to that of DB104. Enzymatic activity of DB104 (pSDJH-cotG-levU) spore showed more than 1.5 times higher levansucrase specific activity compared to that of the host spore, which is a remarkable increase of enzymatic activity considering the existence of sacA (sucrase) and sacB (levansucrase) in the Bacillus subtilis chromosome. The spore integrity, revealed by sporulation frequency test after heat and lysozyme treatment of spore, did not changed at all in spite of the CotG-LevU fusion protein incorporation into the spore coat layer during spore formation process. These data prove again that Bacillus subtilis spore could be considered as good live immobilization vehicle for efficient bioconversion process.

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References

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