Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Responses of Bacteria to TNT: Cells′Survival, SDS-PAGE and 2-D Electrophoretic Analyses of Stress-Induced Proteins

TNT에 대한 세균의 반응기작: 생존율, 스트레스 유도단백질의 SDS-PAGE 및 2-D 전기영동 분석

  • 오계헌 (순천향대학교 자연과학대학 생명과학부) ;
  • 장효원 (순천향대학교 자연과학대학 생명과학부) ;
  • 강형일 (제주대학교 기초과학연구소) ;
  • 김승일 (기초과학지원연구원 생체고분자분석팀)
  • Published : 2002.06.01
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Abstract

The cellular responses of soil-borne bacterium, Pseudomonas sp. HK-6 to explosive 2,4,6-trinitrotoluene (TNT) were examined. Two stress shock proteins (SSPs), approximately 70-kDa DnaK and a 60-kDa GroEL were found in HK-6 cells in response to TNT. Analyses of SDS-PAGE and Western blot using anti-DnaK and GroEL revealed that SSPs were induced in HK-6 cells exposed to 0.5 M of TNT far 6-12 hrs. The maximum induction of proteins was achieved at 8-hr incubation point after HK-6 cells'exposure to TNT. Similar SSPs were found to be induced in HK-6 cells by heat shock (shift of temperature, from $30^{\circ}C$ to $42^{\circ}C$) or cold shock (shift of temperature,$30^{\circ}C$ to $4^{\circ}C$).2D-PAGE of soluble protein tractions from the culture of Pseudomonas sp. HX-6 exposed to TNT demonstrated that approximately 450 spots were observed on the silver stained gels ranging from pH 3 to pH 10. Among them, 12 spots significantly induced and expressed in response to TNT were selected and analyzed. Approximately 60-kDa protein, which was assumed highly expressed on the gel, was used for amino acid sequencing. N-terminal microsequencing with in-gel digestion showed that N-terminal sequence of the TNT-induced protein, <$^1XXAKDVKFGDSARKKML^17$, shared extensive similarity with $^1XXAKDVKFGDSARKKML^17$, N-terminal sequence of (P48216) GroEL of Pseudomonas putida.

폭약 2,4,6-trinitrotoluene (TNT)스트레스 조건하에서 토양세균 Pseudomonas sp. HK-6의 세포반응에 대하여 조사하였다. 다양한 농도의 TNT에 노출됨으로서 약 70-kDa DnaK와 60-kDa GroEL의 스트레스 충격단백질 (stress shock proteins, SSPs)이 단떠질이 유도되었다. 이들 SSPs의 존재는 SDS-PAGE과 anti-DnaK와 anti-GroEL monoclonal antibodies를 이용한 Western bolt을 통하여 확인되었다. SSPs은 0.5 mM TNT로 6-12 시간 처리된 세포에서 나타났으며, TNT에 노출 후8시간대 에서 최대의 단백질 유도가 관찰되었다. $30^{\circ}C$에서 $42^{\circ}C$로 열변환충격을 주었을 때의 SSPs는 TNT노출에서와 유사한 유도양상을 보여주었다. TNT에 노출된 Pseudomonas sp. HK-6세포에서 유도된 SSPs의 존재는 배양된 세포의 수용성 단백질 분획에 대하여 2-D PAGE를 통하여 확인되었다. Coomassie brilliant blue R25O로 염색된 젤로부터 pH 3-10 범위에서 약 450 개의 spots이 탐침되었으며, 이들 가운데 12 개의 spots이 TNT 스트레스에 대하여 현저하게 유도되었다. Gel상에서 가장 짙게 나타난 대표적 인 spot에 대한 N-말단 아미노산 서열을 분석한 결과, $^1XXAKDVKFGDSARKKML^17$로서, Pseudomonas putida의 GroEL의 N-말단 아미노산 염기서열인 $^1XXAKDVKFGDSARKKML^17$과 동일한 것으로 분석되었다.

Keywords

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