한국식품영양과학회지 (Journal of the Korean Society of Food Science and Nutrition)

  • 제40권9호
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  • Pages.1321-1327
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  • 2011
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  • 1226-3311(pISSN)
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  • 2288-5978(eISSN)
한국식품영양과학회 (The Korean Society of Food Science and Nutrition)
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포도주에서 분리한 Saccharomyces cerevisiae JS59가 생성하는 Invertase의 정제 및 특성

Purification and Characterization of an Invertase Produced with Saccharomyces cerevisiae JS59 Isolated from Home-made Wine

  • 유지수 (건국대학교 응용생물화학과) ;
  • 백현동 (건국대학교 축산식품생물공학과) ;
  • 김수영 (건국대학교 생명과학과) ;
  • 이시경 (건국대학교 응용생물화학과)
  • Yoo, Ji-Soo (Dept. of Applied Biology and Chemistry, Konkuk University) ;
  • Paik, Hyun-Dong (Dept. of Food Science and Biotechnology of Animal Resources, Konkuk University) ;
  • Kim, Soo-Young (Dept. of Biological Science, Konkuk University) ;
  • Lee, Si-Kyung (Dept. of Applied Biology and Chemistry, Konkuk University)
  • 투고 : 2010.12.14
  • 심사 : 2011.01.10
  • 발행 : 2011.09.30
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초록

전화당(invert sugar)을 생산하기 위하여 포도주로부터 분리한 효모가 생산하는 invertase의 특성을 조사한 결과는 다음과 같다. 포도주로부터 분리한 효모는 지방산 분석을 통하여 Saccharomyces cerevisiae JS59로 잠정 동정되었다. 본 균주가 생성하는 invertase를 ammonium sulfate 침전, DEAE-Sephadex A-50, Sephadex G-200 column chromatography 법으로 정제하였을 때 단일성을 보였으며, specific activity가 7620.9 unit/mg, 최종 회수율은 13.9로 약 14배 정제된 효소를 얻었다. 본 효소의 $K_m$ 값은 11.5 mM이었다. SDS-PAGE로부터 분자량은 38.5 kDa으로 나타났다. 정제된 invertase의 최적 pH는 5였고, pH 4에서도 94%의 높은 효소활성을 나타냈으며 4에서 6까지의 pH영역에서 안정하였고, $55^{\circ}C$에서 최적 활성을 나타내었으며 $50^{\circ}C$까지는 안정하였다. $Ag^{2+}$와 $Hg^{2+}$에 의해서 저해를 받았고, $Co^{2+}$, $Mn^{2+}$에 의해서는 효소활성이 증가되었으며, 기질과 효소 반응물을 thin layer chromatography로 분석한 결과, 본 효소는 기질인 sucrose를 완전히 분해하여 환원당을 생성함이 확인되었다.

The microorganism producing an invertase (E.C. 3.2.1.26) was isolated from wine and tentatively identified as Saccharomyces cerevisiae by cellular fatty acid analysis. The invertase was purified to homogeneity by ammonium sulfate precipitant, dialysis, ion-exchange chromatography on DEAE-Sephadex A-50, and gel chromatography on Sephadex G-200 from the culture supernatant of Saccharomyces cerevisiae JS59. The specific activity and the purification fold of the purified invertase were 7620.9 unit/mg protein and 13.9, respectively. The molecular weight of the purified invertase was estimated to be 38.5 kDa by SDS-PAGE. The optimum pH and temperature for the invertase activity were pH 5 and $55^{\circ}C$, respectively. The invertase activity was relatively stable at pH 4~6 and temperature $55^{\circ}C$. The activity of invertase was inhibited by $Ag^{2+}$ and $Hg^{2+}$, but on the contrary, activated by $Co^{2+}$ and $Mn^{2+}$. Michaelis constant ($K_m$) for invertase reaction in sucrose solution was 11.5 mM. TLC analysis of the products produced in sucrose solution during invertase reaction showed the progressive presence of glucose and fructose in accordance with sucrose hydrolysis.

키워드

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