Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Identification of Octopine Type Ti Plasmid in Agrobacterium tumefaciens KU12

Agrobacterium tumefaciens KU12내에 존재하는 Octopine Type Ti Plasmid의 확인

  • 이용욱 (고려대학교 이과대학 생물학과) ;
  • 음진성 (목원대학교 이공대학 미생물학과) ;
  • 심웅섭 (고려대학교 이과대학 생물학과)
  • Published : 1993.08.01
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Abstract

Agrobacterium tumefaciens KU12 isolated from Korea is able to induce tumors on various plants and catabolize octopine as a sole carbon and nitrogen source. A, tumefaciens KU12 contains three plasmids. Their sizes are 45.5 kb. 240 kb. and > 240 kb. respectively. For the purpose of identification of octopine type Ti plasmid, avirulent A, tumefacients A136 is transformed with plasmids isolated from KU12 by direct transformation. Transformants containing Ti plasmid were grown on AB medium containing octopine as a sole nitrogen source. The isolated strain, named KU911, contains only 240 kb plasmid. As a result of induction of crown gall and Southern hybridization with other octopine Ti plasmid pTiAch5, 240 kb plasmid named pTiKU12 was Ti plasmid.

국내에서 분리된 Agrobacterium tumefaciens KU12 는 많은 식물체에서 종양을 유발하여 octopine 을 유일한 탄소원과 질소원으로 이용할 수 있다. A. tumefaciens KU12 내에는 크기가 각각 45.5 kb, 240 kb 및 240 kb 이상인 3종류의 플라스미드가 존재하는 것으로 확인되었다. KU12내에 존재하는 octopine type Ti plasmid 를 확인하기 위하여 플라스미드를 가지고 있지 않은 A. tumefaciens A136 을 direct transformation 방법에 따라 KU12 에서 분리한 플라스미드 시료로 형질전환시킨후 질소원으로 octopine 만을 가지로 있는 AB 최소배지를 이용하여 Ti plasmid 에 의해 형질전환된 형질정환체를 선별하였다. 선별된 형질전환체를 A. tumefaciens KU911 이라고 명명하였으며 KU911 내에는 240 kb 크기의 플라스미드만이 존재하였다. 종양형성능 및 Southern hybridization 을 이용하여 octopine type Ti plasmid 인 pTiKU12 로 명명된 240 kb 크기의 플라스미드가 Ti plasmid 임을 확인되었다.

Keywords

References

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