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The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Fibrinolytic Activities and Effects of Gamma-Irradiated on Seeds from Coix lacryma-jobi L. Carthamus tinctorius L. and Malva verticillata L.

율무, 홍화, 아욱종자의 혈전용해 효소활성 및 감마선 조사의 영향

  • Kwon Su-Jung (Biology Research Center of Industrial Accelerators, Dongshin University) ;
  • Lim Chae-Young (Biotechnology Industrialization Center, Dongshin University) ;
  • Kim Jae-Sung (Department of Genetic Engineering, Chosun University) ;
  • Park Min-Hee (Biology Research Center of Industrial Accelerators, Dongshin University) ;
  • Lee Sook-Young (Biology Research Center of Industrial Accelerators, Dongshin University)
  • 권수정 (동신대학교 산업용가속기이용생물연구센터) ;
  • 임채영 (동신대학교 생물자원산업화지원센터) ;
  • 김재성 (조선대학교 유전공학과) ;
  • 박민희 (동신대학교 산업용가속기이용생물연구센터) ;
  • 이숙영 (동신대학교 산업용가속기이용생물연구센터)
  • Published : 2006.02.01
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Abstract

The fibrinolytic activities of soluble proteins extracted from seeds of Coix lacryma-jobi L., Carthamus tinctorius L. and Malva venicillata L. were studied. Fibrinolytic activity of extract from C. lacryma-jobi L. showed 1.3 times higher than plasmin used as positive control. The fibrinolytic enzyme was confirmed and extracted directly from seed of C. lacryma-jobi L. by a fibrin zymography. The protein was composed of a single polypeptide and its apparent molecular weight was found to be 7.8 kDa, as judged by SDS-polyacrylamide gel electrophoresis. The effect of temperature for the proteolytic enzyme activity were stabilized above $50^{\circ}C$ and then dramatically decreased. Also, the enzyme activity was clearly inhibited by APMSF, PMSF and TPCK, suggesting that it is a member of the chymotrypsin-like serine pretense. In addition, effects of gamma-irradiated on seed of each plants were revealed that 8 Gy and 64 Gy were higher than others. This result shown that gamma-irradiation of seeds were capable to increase the fibrinolytic activity. All these results suggest the pretense is a fibrinolytic enzyme belong to a family of chymotrypsin-like serine pretense.

미생물 및 동물에 비해 식물에서는 혈전용해효소에 대한 연구가 부족한 실정이며, 기존의 혈전용해효소가 가지는 혈전에 대한 비특이적, 부작용, 고가 등의 단점을 해결할 수 있는 새로운 혈전용해효소의 개발을 위하여 율무, 홍화, 아욱의 종자로부터 추출된 수용성 단백질의 혈전용해 활성을 조사하였다. 각각의 식물들로부터 추출된 조효소 용액은 기존 혈전 용해효소인 plasmin과 양성 대조군으로 하여 비교하여 fibrin 평판법으로 확인한 결과 피브린 응집을 효과적으로 분해하였다. 그 중 율무종자의 수용성 추출물의 혈전용해 활성은 양성 대조군인 plasmin과 비교하여 1.3배의 높은 활성을 나타내었다. 전체 수용성 단백질은 50-75% 에탄올을 이용하여 농축하였으며 율무의 혈전용해효소는 fibrin zymography를 수행하여 확인하고 직접 추출하였다. SDS-PAGE에 의하여 추출효소의 분자량을 측정한 결과 7.8 kDa으로 단일 polypeptide임을 확인하였으며, 효소 활성에 미치는 온도의 효과는 $50^{\circ}C$ 이상에서는 비교적 안정하였으나 더 낮은 온도에서는 급격히 효소활성이 감소하였다. 또한, 각종 단백질분해효소 저해제에 의한 영향을 조사한 결과 APMSF, PMSF, pepstatin A 그리고 TPCK에 강력하게 저해되는 것으로 보아 추출효소는 chymotrypsin과 유사한 serine protease의 하나로 생각되었다. 그러나 EGTA와 EDTA 처리에 의해서는 효소활성의 저해가 두드러지게 나타나지 않았다. 더욱이, 종자저장 중에 미생물에 의한 부패, 활력저하, 생리활성물질의 감소와 장기저장에 따른 에너지소비 증가 등이 문제가 되고 있어 저선량의 감마선 조사를 통해 율무, 홍화, 아욱의 종자로부터 혈전용해 효소활성에 미치는 효과 및 선량에 따른 차이를 조사하였는데 비조사 종자인 대조구와 비교하여 1 Gy, 4 Gy, 16 Gy, 32 Gy선량에서는 낮은 활성을 보였으면 반면에 8 Gy와 64 Gy의 선량에서는 더 높은 활성을 나타내었다. 이러한 결과는 Y선 조사가 종자의 혈전용해 활성을 향상시킬 가능성이 있을 것으로 생각된다. 이상의 모든 결과로 볼 때 율무의 추출 효소는 chymotrypsin-like serine protease에 속하는 혈전용해효소임을 확인할 수 있었다.

Keywords

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