Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Plastoglobule in chloroplast and its role in prenylquinone metabolism

엽록체 지질 소기관의 기능과 지질대사에서의 역할

  • Kim, Hyun Uk (Department of Agricultural Biotechnology, National Academy of Agricultural Science, Rural Development Administration) ;
  • Kim, Eun-Ha (Department of Agricultural Biotechnology, National Academy of Agricultural Science, Rural Development Administration) ;
  • Lee, Kyeong-Ryeol (Department of Agricultural Biotechnology, National Academy of Agricultural Science, Rural Development Administration) ;
  • Jung, Su-Jin (Department of Agricultural Biotechnology, National Academy of Agricultural Science, Rural Development Administration) ;
  • Roh, Kyung Hee (Department of Agricultural Biotechnology, National Academy of Agricultural Science, Rural Development Administration) ;
  • Kim, Jong-Bum (Department of Agricultural Biotechnology, National Academy of Agricultural Science, Rural Development Administration)
  • 김현욱 (농촌진흥청, 국립농업과학원, 농업생명자원부) ;
  • 김은하 (농촌진흥청, 국립농업과학원, 농업생명자원부) ;
  • 이경렬 (농촌진흥청, 국립농업과학원, 농업생명자원부) ;
  • 정수진 (농촌진흥청, 국립농업과학원, 농업생명자원부) ;
  • 노경희 (농촌진흥청, 국립농업과학원, 농업생명자원부) ;
  • 김종범 (농촌진흥청, 국립농업과학원, 농업생명자원부)
  • Received : 2013.09.08
  • Accepted : 2013.09.22
  • Published : 2013.09.30
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Abstract

Lipid droplets called plastoglobules are present in all plastid types. In chloroplasts, they are surrounded by the outer lipid monolayer from and connected to thylakoid membrane. The plastoglobule core contains the neutral lipids, which includes prenylquinones, triacylglycerols, and carotenoids. During stress and various developmental stages such as senescence, the size and number of plastoglobules increase due to the accumulation of lipids. Plastoglobules proteome revealed the presence of metabolic enzymes as well as structural proteins, plastoglobulins/fibrillins. Among the metabolic enzymes, the tocopherol cyclase, VTE1 and the NADPH quinine dehydrogenase, NDC1 have demonstrated that these participate in isoprenoid lipid metabolic pathways at the plastoglobule, notably in the metabolism of prenylquinones (tocopherol, plastoquinol and phylloquinone).

최근 연구에서 엽록체의 미지의 소기관으로 알려졌던 플라스토글로뷸이 지질 대사에서 중요한 역할을 함이 제시되고 있다. 애기장대 플라스토글로뷸의 프로테옴 단백질 분석은 플라스토글로뷸이 단순히 지질 저장 기관으로써의 기능 뿐아니라 지질 합성 대사에 능동적으로 관여하는 소기관임을 제시하고 있다. 애기장대 플라스토글로뷸에서 34개의 단백질이 발견되었다. 이들을 세 그룹으로 나누어 보면 구조단백질인 플라스토글로불린과 엽록체 대사에 관여하는 효소, 그리고 기능이 미확인된 단백질로 구분 된다. 이들 단백질 유전자의 돌연변이체와 리피도믹스 분석으로 이들 단백질의 기능 규명 연구가 필요하다. 토코페롤 합성의 마지막 단계에 관여하는 VTE1과 VTE4는 엽록체에서 각기 다른 위치에 존재하여 VTE1은 플라스토글로뷸에 존재하나 VTE4는 엽록체 내막에 존재한다. 이 같은 사실은 프레닐퀴논 대사물질이 엽록체 내에서 이동할 가능성을 시사한다. 플라스토글로뷸이 엽록체의 기능을 유지하는데 있어 필수적인지에 대한 유전학 연구가 앞으로 진행되어야 한다. 다양한 스트레스와 발달단계에 따른 플라스토글로뷸의 프로테옴 분석은 지질대사에서 중요한 기능을 하는 신규 단백질을 발견하는데 도움을 줄 것이다. 지금까지 결과로는 플라스토글로뷸은 프레릴퀴논 대사에 있어서 교차로 역할을 함을 제안하고 있다.

Keywords

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