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The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Analysis of Chemical Constituents of Agastachis Herba and in silico Investigation on Antidiabetic Target Proteins of its Major Compounds

곽향의 성분 분석 및 주요 성분들의 in silico 항당뇨 타겟 단백질 탐색

  • Choi, Jongkeun (Department of Chemical Engineering, Chungwoon University)
  • 최종근 (청운대학교 화학공학과)
  • Received : 2021.01.06
  • Accepted : 2021.04.02
  • Published : 2021.04.30
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Abstract

Agastachis Herba (AH) to treat anorexia and nausea and its antidiabetic efficacy was recently reported. This study examined the antioxidant activities and chemical constituents of AH and predicted the target proteins of each compound using in silico approaches. The results showed that EC50 values of AH methanol extract for DPPH and ABTS radical scavenging were 78.6 ㎍/mL and 31.0 ㎍/mL, respectively. Compared to the EC50 values of ascorbic acid (9.9 ㎍/mL, 5.2 ㎍/mL), the AH methanol extract possessed excellent antioxidant activities. Rosmarinic acid, tilianin, agastachoside, and acetin were confirmed as the major compounds of extracts by qualitative analysis performed with HPLC-PDA-MS/MS. The antidiabetic target proteins of these compounds were predicted by applying a structural similarity and inverse docking methodology using a DIA-DB server. The resulting target proteins were PPAR-γ, DPP IV, glucokinase, α-glucosidase, SGLT2, aldose reductase, and corticosteroid 11-beta-dehydrogenase, some of which have already been proven experimentally as target proteins. Therefore, the in silico methods can be considered valid. Finally, AH were extracted with various solvents to determine the optimal conditions for the extraction of active components. Methanol among organic solvents and 80% ethanol in ethanol-water mixtures were identified as the most effective solvent for the extraction.

곽향은 식욕부진, 메스꺼움 등의 치료에 사용될 뿐만 아니라 최근에는 항당뇨 효능도 알려졌다. 본 연구에서는 곽향의 항산화력과 주요 성분들을 조사한 다음, in-silico 방법론을 적용하여 타겟 단백질들을 예측하였다. 먼저 메탄올 추출물의 DPPH와 ABTS 라디칼 소거능의 EC50 값은 각각 78.6 ㎍/mL과 31.0 ㎍/mL이었다. 이것은 ascorbic acid의 값(9.9 ㎍/mL, 5.2 ㎍/mL)과 비교할 때 항산화력이 뛰어나다고 할 수 있다. HPLC-PDA-MS/MS를 이용하여 성분들을 정성 분석한 결과, 추출물의 주요 화합물로 rosmarinic acid, tilianin, agastachoside 그리고 acacetin을 확인하였다. 이들 성분들의 항당뇨 작용 타겟 단백질을 DIA-DB 서버를 사용하여 구조 유사도와 inverse doking 방법론을 적용하여 예측하였다. 본 가상 탐색 결과, 주요 타겟 단백질들은 PPAR-γ, DPP IV, glucokinase, α-glucosidase, SGLT2, aldose reductase, corticosteroid 11-beta-dehydrogenase로 예측되었다. 그리고 이들 단백질들 중 일부는 이미 실험적으로 검증된 타겟 단백질이었다. 따라서 in silico 검색 방법이 유효하다고 생각할 수 있다. 마지막으로 활성성분들의 최적의 추출 조건을 결정하기 위하여 여러 추출 용매들로 곽향을 추출하였다. 여러 유기 용매들 중에는 메탄올이 그리고 에탄올-물 혼합용매에서는 80% 에탄올이 가장 효과적인 추출 용매로 확인되었다.

Keywords

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