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

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Purification and Characterization of Transglutaminase from a Newly Isolated Streptomyces platensis YK-2

토양 방선균 Streptomyces platensis YK-2가 생산하는 Transglutaminase의 정제 및 효소학적 특성

  • Ko, Hee-Sun (Dept. of Microbiology, Keimyung University) ;
  • Kim, Hyun-Soo (Agricultural Microbiology Division, National Academy of Agricultural Science, RDA)
  • 고희선 (국립농업과학원 농업미생물과) ;
  • 김현수 (계명대학교 미생물학과)
  • Published : 2009.06.30
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Abstract

A species producing transglutaminase (EC 2.3.2.13) was isolated from forest soil and identified as Streptomyces platensis YK-2. The transglutaminase was purified from culture broth by 50% methanol precipitation, followed by successive chromatography on DEAE-Sephadex. The yield and purification-fold was 63.4% and 2.2-fold, respectively. The purified microbial transglutaminase (MTG) migrated as a single band of approximately 45 kDa upon sodium dodecyl sulfate polyacrylamide gel eletrophoresis. The isoelectric point determined by multichambered electrofocusing was pH $6.0{\sim}7.0$. The enzyme was strongly inhibited by $Hg^{++}$, but was activated by $Cd^{++}$, $Mg^{++}$, $Mn^{++}$, $Pb^{++}$ and reducing agents such as dithiothreitol and mercaptoethanol.

본 연구는 transglutaminase 생산능이 우수한 토양유래방선균 strain YK-2를 TGase 최적생산배지에서 $28^{\circ}C$, 5일간 배양하여 얻은 배양여액으로 본 효소의 정제 및 정제된 효소의 효소화학적 특성에 관하여 검토한 것이다. 본 효소의 정제는 50% methanol precipitation, DEAE-Sephadex column chromatography의 정제 절차를 거쳐 56.5%의 수율로 정제되었고, 정제된 효소의 순도는 12.5% SDS-PAGE에서 단일 밴드를 나타내어, 서브유닛트의 분자량이 약 45,000 dalton으로 추정되는 호모형 효소인 것을 알 수 있었다. 정제된 TGase의 생화학적 제 특성을 검토한 결과, 등전점은 pH $6.0{\sim}7.0$ 부근에 있는 것으로 나타났으며, 본 효소의 기질인 CBZ-L-Gln-Gly 농도에 대한 Km치는 18.5 mM으로 추산되었다. 또한 금속이온 및 저해제의 영향으로는 $Hg^{++}$에 의해서 본 효소의 활성이 강하게 저해되었으나, DTT 및 mercaptoethanol에 의해 각각 293% 및 219% 활성이 증가하였다.

Keywords

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