Journal of Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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Optimization of bioactive isorhamnetin 3-O-glucoside production in Escherichia coli

대장균에서 isorhamnetin 3-O-glucoside의 생합성 최적화

  • Kim, Bong-Gyu (Department of Forest Resources, Gyeongnam National University of Science and Technology)
  • Received : 2019.10.07
  • Accepted : 2019.10.21
  • Published : 2019.12.31
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Abstract

Isorhamnetin 3-O-glucoside, a member of the flavonol group, has been reported to be effective for inflammatory and ulcer, as well as to alleviate diabetic complications such as neuropathy, nephropathy and retinopathy. Isorhamnetin 3-O-glucoside has been extracted from several plants. Biotransformation is a valuable tool, which is used to produce value-added chemicals with inexpensive compounds. To synthesis isorhamnetin 3-O-glucoside from quercetin, two genes (PGT E82L and ROMT-9) were introduced into Escherichia coli, respectively. In order to synthesis isorhamnetin 3-O-glucoside from quercetin, a co-culture fermentation system was developed by optimizing the medium and temperature for biotransformation, the cell mix ratio, Isopropyl-β-ᴅ-thiogalactoside induction time, and quercetin feed concentration. Finally, isorhamnetin 3-O-glucoside was biosynthesized up to 181.2 mg/L under the optimized biotransformation condition, which was higher 4.7 times than previously reported (39.6 mg/L).

Isorhamnetin 3-O-glucoside는 플라보놀 그룹에 속하는 물질로서 염증이나 궤양에 효과가 있을 뿐만 아니라 신경장해, 신장병증, 망막증과 같은 당뇨합병증을 완화하는 것으로 보고되었다. Isorhamnetin 3-O-glucoside는 Tetraena aegyptia, Salsola oppositifolia, Salicornia herbacea, Sambucus ebulus와 같은 몇몇 식물에서 발견된다. 생물전환은 저렴한 화합물로부터 고부가가치 물질을 생산할 수 있는 유용한 방법이다. 본 연구에서 생물전환을 통해 quercetin으부터 isorhamnetin 3-O-glucoside를 생합성 하기 위해 두 개의 유전자(PGT E82L과, ROMT-9)를 각각의 대장균에 도입하였다. 대장균의 공조배양시스템을 이용하여 isorhamnetin 3-O-glucoside 생산 배양법의 최적화를 위해 생물전환배지, 배양온도, 세포의 혼합비율, 재조합 단백질 유도시간, 기질 공급 농도 등을 테스트하였다. 최적화된 생물전환 조건하에서 생물전환을 실시하였으며, 배양의 12시간 후 181.2 mg/L의 isorhamnetin 3-O-glucoside가 생합성 되었다. 이는 이전의 연구에서 보고된 isorhamnetin 3-O-glucosie (39.6 mg/L)의 생합성보다 4.7배 높았다.

Keywords

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