Journal of Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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Biosynthesis of trifolin, a bioactive flavonoid by biotransformation

생물전환으로 생리활성물질인 trifolin의 생합성

  • Noh, Hye-Ryeong (Department of Forest Resources, Gyeongsang National University) ;
  • Kang, Ju-Yeong (Department of Forest Resources, Gyeongsang National University) ;
  • Kim, Bong-Gyu (Department of Forest Resources, Gyeongsang National University)
  • Received : 2021.08.18
  • Accepted : 2021.09.02
  • Published : 2021.09.30
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Abstract

Kaempferol 3-O-galactoside (Trifolin), a member of the flavonol group, has been reported to have anticancer effects against promyelocytic leukemia, histocytic lymphoma, skin melanoma and lung cancer. Trifolin has been extracted and used from several plants, but the extraction process is complicated and the final yield is low. Biotransformation is an alternative tool to produce high value-added chemicals from inexpensive compounds. To synthesis trifolin from naringenin, three genes (PeFLS and OsUGE-PhUGT) were introduced into Escherichia coli, respectively. In order to synthesis trifolin from naringenin, a co-culture fermentation system was established by optimizing the cell concentration, biotransformation temperature and medium, isopropyl-β-D-thiogalactoside (IPTG) concentration, substrate supply concentration, and recombinant protein induction time. The established optimal conditions for trifolin production were a 3:1 ratio of BL-UGTE to BL-FLS, induction of recombinant protein at 25 ℃ for 4 h after addition of 2.0 mM IPTG, biotransformation at 30 ℃, and supply of 300 μM naringenin. Through the optimized co-culture fermentation system, trifolin was biosynthesized up to 67.3 mg/L.

Trifolin (kaempferol 3-O-galactoside)는 플라보놀 그룹에 속하는 물질로 아토피, 항균, 폐암에 효과가 있는 것으로 알려져 있다. Trifolin은 다양한 식물에서 추출하여 사용하고 있지만 추출 과정이 복잡하고, 수율이 낮으며, 추출을 위한 바이오매스를 얻는데 계절적 어려움이 있다. 생물전환은 저렴한 화합물에서 고부가가치 화학물질을 생산할 수 있는 대체 수단으로 이용된다. 본 연구에서는 naringenin으로부터 trifolin을 생합성하기 위해 3개의 유전자(PeFLS 및 OsUGE-PhUGT)를 각각의 대장균에 도입한 BL-FLS균주와 BL-UGTE균주를 이용하여 공조배양시스템을 개발하였다. Naringenin으로부터 trifolin을 생합성하기 위해 세포의 밀도, 생물전환 온도, 재조합 단백질 유도의 적정 IPTG농도 및 시간, 기질 공급 농도 등의 최적화를 실시하였다. 최적화된 공동 배양 발효 시스템을 통해 67.3 mg/L의 trifolin을 성공적으로 생합성 하였다.

Keywords

Acknowledgement

이 논문은 경상국립대학교 2020-2021년도 대학회계 연구비에 의하여 연구되었습니다.

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