Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Flavonoid Biosynthesis: Biochemistry and Metabolic Engineering

Flavonoid 생합성:생화학과 대사공학적 응용

  • Park, Jong-Sug (Metabolic Engineering Division, National Institute of Agricultural Biotechnology, RDA) ;
  • Kim, Jong-Bum (Metabolic Engineering Division, National Institute of Agricultural Biotechnology, RDA) ;
  • Kim, Kyung-Hwan (Metabolic Engineering Division, National Institute of Agricultural Biotechnology, RDA) ;
  • Ha, Sun-Hwa (Metabolic Engineering Division, National Institute of Agricultural Biotechnology, RDA) ;
  • Han, Bum-Soo (Metabolic Engineering Division, National Institute of Agricultural Biotechnology, RDA) ;
  • Kim, Yong-Hwan (Metabolic Engineering Division, National Institute of Agricultural Biotechnology, RDA)
  • 박종석 (농업생명공학연구원 신기능소재개발과) ;
  • 박종범 (농업생명공학연구원 신기능소재개발과) ;
  • 김경환 (농업생명공학연구원 신기능소재개발과) ;
  • 하선화 (농업생명공학연구원 신기능소재개발과) ;
  • 한범수 (농업생명공학연구원 신기능소재개발과) ;
  • 김용환 (농업생명공학연구원 신기능소재개발과)
  • Published : 2002.12.01
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Abstract

Flavonoid biosynthesis is one of the most extensively studied areas in the secondary metabolism. Due to the study of flavonoid metabolism in diverse plant system, the pathways become the best characterized secondary metabolites and can be excellent targets for metabolic engineering. These flavonoid-derived secondary metabolites have been considerably divergent functional roles: floral pigment, anticancer, antiviral, antitoxin, and hepatoprotective. Three species have been significant for elucidating the flavonoid metabolism and isolating the genes controlling the flavonoid genes: maize (Zea mays), snapdragon (Antirrhinum majus) and petunia (Prtunia hybrida). Recently, many genes involved in biosynthesis of flavonoid have been isolated and characterized using mutation and recombinant DNA technologies including transposon tagging and T-DNA tagging which are novel approaches for the discovery of uncharacterized genes. Metabolic engineering of flavonoid biosynthesis was approached by sense or antisense manipulation of the genes related with flavonoid pathway, or by modified expression of regulatory genes. So, the use of a variety of experimental tools and metabolic engineering facilitated the characterization of the flavonoid metabolism. Here we review recent progresses in flavonoid metabolism: confirmation of genes, metabolic engineering, and applications in the industrial use.

주요 농작물에서 건강-방어용 flavonoids 생성, phytoalexin (isoflavonoid, flavanol, proanthocyanidin)의 생성 및 소절을 통한 식물의 저항력 증대, 색소 (flavonol, anthocyanin)의 합성에 의한 자외선 방어, nod 유전자 inducer (flavones, isoflavones)의 대량 발현에 의한 혹 형성 (nodulation) 효율증대 등은 대사공학 적으로 향상 가능한 부분들이다. 파란 꽃을 개화하는 품종이 카네이션, 국화, 장미 등 중요 장식용 화훼작물들에는 결핍되어 있는데,이는 F3'5'H 유전자가 없어서 파란색 delphinidin 색소를 생산할 수 없기 때문으로 추정된다. 따라서 F3'5'H 유전자를 형질전환 하여 이러한 제한을 극복하고 delphinidin 유도체 생산이 가능하게 되면 파란색 꽃의 생산 가능성을 증대시킬 수 있게 된다. 또한 영양학적인 측면에서 이미 중요한 생리적 기능이 밝혀진 catechin을 비롯한 proanthocyanidin 과 anthocyanin은 의약품 및 식품첨가제 등 다양한 분야에서 크게 시장성을 넓히고 있어 상업적 측면에서 대사공학의 유망한 목표가 되고 있다. 최근의 대사공학 분야에서의 많은 성공에도 불구하고, flavonoid에 대한 고도의 대사공학 조절을 이용하여 원하는 flavonoid 화합물을 생성하거나, 원치 않는 flavonoid 화합물을 억제하도록 하는 데는 여전히 기술적 문제점들이 남아있다. 예를 들면 IFS와 FLS 등의 유전자 분리 그리고 조직 및 시기 특이적인 promoter 개발 등이 동시에 이루어져야 하며, co-pigmentation 및 액포 pH와 관련된 메카니즘에 대한 이해, 화훼작물들의 형질전환 기술 개발 등이 이루어져야 원하는 꽃의 착색 조절이 가능하게 될 것이다. 최근 나팔꽃에서 액포의 $Na^{＋}$H$^{＋}$ exchanger를 파괴하여 화색을 변경시킨 mutants 연구를 통하여 조만간 액포 pH의 조절을 이용한 식물 대사공학이 가능할 것으로 기대되고 있다 (Yamaguchi et al. 2001). 아직 자연계에서 기본적인 골격의 변경만으로 수천 종류의 flavonoid가 생성 가능한가는 여전히 의문점으로 남아 있으나, 분명한 것은 다양한 식물 체계에서의 노력으로 농업, 원예, 그리고 영양분 증대를 위한 flavonoid 대사를 어떻게 조절할 것인가에 대한 정보를 얻을 수 있고, 또한 flavonoid 생합성 연구로부터 얻어진 정보들을 통하여 세포질 대사와 기본적인 생물학적 현상에 대한 이해를 넓힐 수 있게 될 것이다.

Keywords

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