Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Inhibitory Effects of a Recombinant Viral Cystatin Protein on Insect Immune and Development

바이러스 유래 시스타틴 재조합 단백질의 곤충 면역 및 발육 억제효과

  • Kim, Yeongtae (Department of Bioresource Sciences, Andong National University) ;
  • Eom, Seonghyun (Department of Bioresource Sciences, Andong National University) ;
  • Park, Jiyeong (Department of Bioresource Sciences, Andong National University) ;
  • Kim, Yonggyun (Department of Bioresource Sciences, Andong National University)
  • 김영태 (안동대학교 생명자원과학과) ;
  • 엄성현 (안동대학교 생명자원과학과) ;
  • 박지영 (안동대학교 생명자원과학과) ;
  • 김용균 (안동대학교 생명자원과학과)
  • Received : 2014.07.18
  • Accepted : 2014.09.18
  • Published : 2014.12.01
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Abstract

Cystatins (CSTs) are reversible and competitive inhibitors of C1A cysteine proteases, corresponding to papain-like cathepsins in plants and animals. A viral CST (CpBV-CST1) was identified from a polydnavirus, Cotesia plutellae bracovirus (CpBV). Our previous study indicated that a transient expression of CpBV-CST1 interfered with immune response and development of Plutella xylostella larvae. To directly demonstrate the protein function, this study produced a recombinant CpBV-CST1 protein (rCpBV-CST1) using bacterial expression system to determine its inhibitory activity against cysteine protease and to assess its physiological alteration in insect immune and development. The open reading frame of CpBV-CST1 encodes a polypeptide of 138 amino acids (${\approx}15kDa$). rCpBV-cystatin protein in BL21 STAR (DE3) competent cells containing a recombinant pGEX4T-3:CpBV-CST1 was over-expressed by 0.5 mM IPTG for 4 h. In biological activity assay, the purified rCpBV-CST1 showed a significant inhibition against papain activity. It inhibited a cellular immune response of hemocyte nodule formation in the beet armyworm, Spodoptera exigua. Moreover, its oral administration retarded larval development of the diamondback moth, Plutella xylostella in a dose-dependent manner. These results suggest that CpBV-CST1 may be applied to control insect pest populations.

시스타틴(cystatin: CST)은 C1A류 시스테인 단백질분해효소에 대한 경쟁적 가역억제자로서 동식물류에서 파파인과 같은 캐셉신을 억제대상으로 작용하게 된다. 바이러스 유래 CST (CpBV-CST1)이 폴리드나바이러스의 일종인 CpBV (Cotesia plutellae bracovirus)에서 동정되었다. 기존 연구는 이 유전자의 과발현이 배추좀나방(Plutella xylostella) 유충의 면역 및 발육을 교란한다는 것을 보여 주었다. 본 연구는 이 유전자의 단백질 기능을 분석하기 위해 세균발현시스템을 이용하여 재조합단백질(rCpBV-CST1)을 형성하여 단백질분해효소에 대한 활성억제효과를 결정하고, 곤충의 면역과 발육에 대한 생리적 억제효과를 분석했다. 이 유전자 번역부위는 138 개 아미노산으로 약 15 kDa 크기의 단백질로 추정되었다. CpBV-CST1이 먼저 pGEX 발현벡터에 재조합되고, BL21 STAR (DE3) competent cells에 형질전환된 후 0.5 mM IPTG로 4 시간동안 과발현되었다. 분리된 재조합단백질은 파파인에 대한 뚜렷한 억제효과를 나타냈다. 이 재조합단백질은 파밤나방(Spodoptera exigua)에 대해서 혈구소낭형성의 세포성 면역반응을 억제하고, 경구로 처리할 때 배추좀나방의 유충발육을 처리 농도에 비례하여 제한시켰다. 이상의 결과는 CpBV-CST1이 해충 밀도 억제에 응용될 수 있음을 제시하고 있다.

Keywords

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