Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Characterization of Extracellular \alpha-galactosidase Produced by Streptomyces sp. YB-4.

균체외 \alpha-galactosidase를 생산하는 Streptomyces sp. YB-4의 분리 및 효소 특성

  • 김소영 (우송대학교 식품생명과학부) ;
  • 조기행 (씨티씨바이오 중앙연구소) ;
  • 김창진 (한국생명공학연구원) ;
  • 박동진 (한국생명공학연구원) ;
  • 윤기홍 (우송대학교 식품생명과학부)
  • Published : 2002.12.01
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Abstract

A strain YB-4 producing the extracellular $\alpha$-galactosidase was isolated from soil, and has been identified as Streptomyces sp. on the basis of its cultural, morphological and physiological properties. The partially purified $\alpha$-galactosidase was most active on paranitrophenyl-$\alpha$-D-galactopyranoside at pH 6.0 and 6$0^{\circ}C$. The enzyme retained 90% of its maximum activity between pH 4.0 and pH 10.0 after pre-incubation for 1 h. The enzyme was able to hydrolyze oligomeric substrates such as melibiose, raffinose and stachyose to liberate galactose residue, indicating that the $\alpha$-galactosidase of Steptomyces sp. YB-4 hydrolyzed $\alpha$-1,6 linkage.

토양으로부터 세포외로 $\alpha$-galactosidase를 분비 생산하는 방선균 YB-4가 분리되었으며, 분리균의 배양ㆍ형태ㆍ생리적 특성을 조사한 결과 Streptomyces 속 균주로 확인되었다. 분리균의 배양상등액으로부터 부분정제된 $\alpha$-galactosidase를 조효소액으로 사용하였을 때 para-nitrophenyl-$\alpha$-D-galacto-pyranoside는 pH 6.0과 6$0^{\circ}C$의 반응조건에서 가장 잘 분해되었으며, 조효소액을 pH 4.0에서 pH 10.0범위에서 1시간 이상 방치한 후에도 약 90% 이상의 $\alpha$-galactosidase 활성을 유지하였다. 또한 분리균이 생산하는 $\alpha$-galactosidase는 melibiose, raffinose와 stachyose와 같은 저당류를 가수분해 할 수 있으며 분해산물로 galactose를 방출하는 것으로 보아 $\alpha$-1,6 결합을 분해한 것으로 확인되었다.

Keywords

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