Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Screening of Outstanding White Rot Fungi for Biodegradation of Organosolv Lignin by Decolorization of Remazol Brilliant Blue R and Ligninolytic Enzymes Systems

Remazol Brilliant Blue R 탈색능과 리그닌 분해 효소시스템을 이용한 유기용매 리그닌 생분해 우수 균주 선별

  • Hong, Chang-Young (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University) ;
  • Kim, Ho-Yong (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University) ;
  • Jang, Soo-Kyeong (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University) ;
  • Choi, In-Gyu (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University)
  • 홍창영 (서울대학교 농업생명과학대학 산림과학부) ;
  • 김호용 (서울대학교 농업생명과학대학 산림과학부) ;
  • 장수경 (서울대학교 농업생명과학대학 산림과학부) ;
  • 최인규 (서울대학교 농업생명과학대학 산림과학부)
  • Received : 2012.11.12
  • Accepted : 2013.01.09
  • Published : 2013.01.25
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Abstract

In this study, outstanding white rot fungi for biodegradation of organosolv lignin were selected on the basis of their ligninolytic enzyme system. Fifteen white rot fungi were evaluated for their ability to decolorize Remazol Brilliant Blue R (RBBR) in SSC and MEB medium, respectively. Six white rot fungi (Ceriporiopsis subvermispora, Ceriporia lacerate, Fomitopsis insularis, Phanerochaete chrysosporium, Polyporus brumalis, and Stereum hirsutum) decolorized RBBR rapidly in SSC medium within 3 days. The protein contents as well as the activities of manganese peroxidase (MnP) and laccase for 6 selected fungi were determined on the SSC medium with and without organosolv lignin. Interestingly, extracellular protein concentrations were determined to relative higher for S. hirsutum and P. chrysosporium in the presence of organosolv lignin than others. On the other hands, each fungus showed a different ligninolytic enzyme pattern. Among them, F. insularis resulted the highest ligninolytic enzyme activities on incubation day 6, indicating of 1,545 U/mg of MnP activity and 1,259 U/mg of laccase activity. In conclusion, $STH^*$ and FOI were considered as outstanding fungi for biodegradation of organosolv lignin, because $STH^*$ showed high extracellular protein contents and ligninolytic enzyme activities over all, and ligninolytic enzyme activities of FOI were the highest among white rot fungi used in this study.

본 연구에서는 백색부후균의 리그닌 분해 효소 시스템을 이용하여, 다양한 균주 중에서 목질계 바이오매스 유기용매 전처리 과정에서 발생한 리그닌(유기용매 리그닌)의 생분해에 적합한 우수 균주를 선별하고자 하였다. 우선 분양받은 15개의 백색부후균을 대상으로 shallow stationary cultur (SSC)배지와 malt extract broth (MEB)배지에 유기용매 리그닌의 첨가에 따른 Remazol Brilliant Blue R (RBBR)의 흡광도 변화를 측정하였다. RBBR 탈색능 결과, SSC 배지에서 Ceriporiopsis subvermispora, Ceriporia lacerate, Fomitopsis insularis, Phanerochaete chrysosporium, Polyporus brumalis, Stereum hirsutum 등 6종의 백색부후균에서 급격한 흡광도 변화를 나타냈다. 배양 초기에 급격한 흡광도 변화를 나타낸 6개의 백색부후균을 대상으로 균체 외 단백질 농도 및 리그닌 분해 효소 활성을 측정하였다. 선발된 6개의 균 중에서 S. hirsutum과 P. chrysosporium은 유기용매 리그닌을 첨가한 실험구에서 높은 단백질 농도가 측정되었다. 반면, 리그닌 분해 효소 활성은 F. insularis에서 배양 6일째에 manganese peroxidase (MnP) 활성이 1,545 U/mg, laccase 활성은 1,259 U/mg으로 최고 활성을 나타냈다. 결론적으로, 균체 외 단백질 농도 및 리그닌 분해 효소 활성이 전반적으로 높았던 $STH^*$와 MnP 및 laccase의 활성이 가장 높은 FOI가 유기용매 리그닌 생분해에 유리하게 작용할 것으로 판단된다.

Keywords

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