Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Production of Inulin Fructotransferase (Depolymerizing) from Enterobacter sp. S45

Enterobacter sp. S45에 의한 Inulin fructotransferase의 생산

  • 강수일 (농업개발연구소) ;
  • 김수일 (서울대학교 농업생명과학대학 농화학과 및 농업생물신소재연구센터)
  • Published : 1993.02.01
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Abstract

A bacterial strain, producing extracellular inulin fructotransferase which converts inulin into di-D-fructofuranose dianhydride (DFA) was isolated from soil and presumed as Enterobacter sp. The DFA isolated on Bio-gel P2 column was identified as DFA III by high performance liquid chromatography and $^13C-nmr$ spectroscopy. The enzyme production was induced by inulin and markedly enhanced by the addition of corn steep liquor and $NH_4H_2P0_4$ for nitrogen source. Under optimum condition, the enzyme activity in the culture broth reached at maximum, 0.22 unit/ml after cultivation for 72 hour.

토양에서 inulin으로부터 di-D-fructofuranose dianhydride(DFA)를 생산하는 inulin fructotransferase를 생산하는 균주로 Enterobacter sp. S45를 선발, 분리하였다. 본 효소에 의하여 생산되는 DFA는 $^13C-nmr$과 HPLC로 분석한 결과 fructose 두 분자가 $\beta$ 1,2': $\alpha$ 2,3' 결합을 한 DFA III로 동정되었다. 본 균주는 탄소원으로 inulin, 유기질소원으로 corn step liquor, 무기질소원으로 $NH_4H_2P0_4$를 사용할 때 효소생산이 가장 많았으며 이 조건하에서 72시간 배양으로 최대 효소생산을 보였다. 균 배양중 배양액내에 DFA III가 생성되었다가 소멸되는 것으로 보아 균체내에 DFAIII를 분해, 이용하는 효소가 존재한다고 추정되었다.

Keywords

References

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