Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Biodegradation of Phenanthrene by Transformant Trametes versicolor MrP1

구름버섯의 형질전환체 Trametes versicolor MrP1에 의한 Phenanthrene의 생분해

  • Choi, Yun-Seong (Division of Life Sciences, Research Institute of Life Sciences, Kangwon National University) ;
  • Choi, Hyoung-Tae (Division of Life Sciences, Research Institute of Life Sciences, Kangwon National University) ;
  • Song, Hong-Gyu (Division of Life Sciences, Research Institute of Life Sciences, Kangwon National University)
  • 최윤성 (강원대학교 자연과학대학 생명과학부) ;
  • 최형태 (강원대학교 자연과학대학 생명과학부) ;
  • 송홍규 (강원대학교 생명과학연구소)
  • Published : 2007.12.30
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Abstract

As a model compound of PAHs (polycyclic aromatic hydrocarbons) phenanthrene has been regarded as a toxic material, mutagen and carcinogen in various animals. Biodegradation conditions of phenanthrene such as pH, temperature, shaking speed, stabilizer and cofactor of degrading enzymes were investigated with Trametes versicolor and its transformant T. versicolor MrP1 in YMG medium, minimal medium and soil microcosm. T. versicolor MrP1 can overexpress mrp gene encoding Mn-repressed peroxidase that is involved in fungal degradation. Biodegradations of phenanthrene by T. versicolor and T. versicolor MrP1 were optimally performed in conditions of weak-acid (pH 6.0), $30^{\circ}C$, shaken culture and medium containing 5 mM veratryl alcohol or tryptophan. In these optimal conditions, biodegradation of phenanthrene by T. versicolor MrP1 is 31% higher than that of wild type strain in a minimal medium for 20 days. Biodegradation of phenanthrene by T. versicolor MrP1 was also higher than that of wild type in soil microcosm. T. versicolor MrP1 can be a excellent candidate for the bioremediation of PAHs contaminated environments.

난분해성과 독성을 나타내고 인간에게 돌연변이와 암을 유발한다고 알려진 다핵방향족 탄화수소를 대상으로 분자적 방법을 이를하여 개발한 백색부후균 형질전환체와 야생형균주의 최적 생분해조건에서의 생분해능을 비교하였다. 구름버섯 Trametes versicolor와 그것의 형질전환체 T. versicolor MrP1의 phenanthrene 생분해는 veratryl alcohol과 tryptophan을 첨가한 pH 6.0의 약산성 배지에서 $30^{\circ}C$로 진탕배양할 때 최적의 생분해능을 나타내었으며 형질전환체와 야생형균주 대조군의 최적조건은 유사하였다. 조사된 최적조건의 최소배지에서 20일간 배양하였을 때 T. versicolor MrP1이 대조군에 비해 31% 더 높은 phenanthrene 분해능을 나타냈다. 실제 토양 환경을 대상으로 한 생분해 실험에서도 형질전환체가 우수한 phenanthrene 분해능을 나타났으며 이러한 결과는 형질전환체를 이용한 새로운 균주의 개발이 환경에 존재하는 난분해성 물질의 분해에 큰 기여를 할 수 있음을 보여준다.

Keywords

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