Journal of Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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Construction of novel promoters based on the characteristics of drought stress specific cis-regulatory element

가뭄 스트레스 특이적인 cis-regulatory element의 특성을 기반으로 한 신규 프로모터 구축

  • Kim, Kihwan (Department of Applied Biosciences, Kyungpook National University) ;
  • Kim, Byeonggyu (Department of Integrative Biology, Kyungpook National University) ;
  • Shin, Juhyung (Department of Integrative Biology, Kyungpook National University) ;
  • Kim, Won-Chan (Department of Applied Biosciences, Kyungpook National University)
  • Received : 2020.11.09
  • Accepted : 2020.12.31
  • Published : 2021.03.31
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Abstract

Droughts are one of the abiotic stresses that hinders the growth and productivity of crop plants. Coping with abiotic stress is necessary to understand the molecular regulatory networks that makes plants respond to adverse environmental conditions. In our experiment to find a combination that can cope with abiotic stress (respond to drought), we screened 5 stress-inducible promoters that are expressed only under stress conditions. This founded 36 cis-elements in stress-inducible promoters. With the result we designed 2 synthetic promoters (BL1, BL2) for fine-controlled regulation by assembling cis-elements from the native promoters, which are expressed only under stress caused by droughts. Analysis of the transgenic plant (BL1-GUS, BL2-GUS) showed that the synthetic promoters increased the expression of β-glucuronidase (GUS) in transgenic plants under desiccation. Also in the transient activation assay demonstrated that synthetic promoters induced the co-transformation of effector DREB1A and DREB2C. These results expect that the synthetic promoter with a combination of drought-specific elements can be used to respond to various abiotic stress and is resistant to stress without causing growth retardation.

가뭄은 작물의 성장과 생산성을 방해하는 비 생물학적 스트레스 중 하나다. 비 생물학적 스트레스에 대응하기 위해서는 식물이 불리한 환경 조건에서 스트레스에 나타내는 분자 조절 네트워크를 이해해야 한다. 비 생물학적 스트레스 (가뭄에 대응)에 대처할 수 있는 조합을 선별하기 위한 실험에서 스트레스 조건에서만 발현되는 5개의 가뭄 스트레스 유도성 프로모터를 선별하였으며, 이 중 36개의 cis-regulatory element를 선별하였다. 그 결과 가뭄 스트레스에서만 발현되는 유전자의 프로모터에서 cis-regulatory element를 새롭게 조합하여 미세 제어 조절을 할 수 있는 2 개의 합성프로모터(BL1, BL2)를 제작하였다. 합성프로모터를 포함한 형질전환식물(BL1-GUS, BL2-GUS)의 분석은 합성프로모터가 건조 조건에서 형질전환식물 내의 GUS 유전자의 발현을 증가시키는 것을 통하여 확인하였다. 또한 Transient activation assay를 통해 DREB1A와 DREB2C에 의해 합성프로모터가 활성화되는 것도 확인하였다. 이러한 결과는 가뭄 특이적인 cis-regulatory element의 조합에 의해 제작한 합성프로모터가 다양한 비 생물학적 스트레스에 반응하고, 식물의 성장 지연을 유발하지 않고 스트레스에 효과적으로 대응할 수 있을 것이라 예상할 수 있다.

Keywords

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