Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Screening of Wood-Rot Fungi Based on RBBR Decolorization and Its Laccase Activity

RBBR 탈색능을 이용한 목재부후균의 선발 및 이들 균의 Laccase 효소활성

  • Choi, Yun-Jeong (R & D Center, Enbita Co. Ltd.) ;
  • Shin, Yoo-Su (National Institute of Crop Science, RAD) ;
  • Cho, Nam-Seok (School of Forest Resources and Rural Engineering, Chungbuk National University)
  • 최윤정 (주식회사 엔바이타 연구개발실) ;
  • 신유수 (농촌진흥청 작물과학원 인삼약초과) ;
  • 조남석 (충북대학교 농업생명환경대학 산림과학.지역건설공학부)
  • Received : 2006.04.05
  • Accepted : 2006.05.17
  • Published : 2006.07.25
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Abstract

This study was to screen white-rot fungi possesing strong lignin degrading enzymes, glucose-1 oxidase (GOD), laccase (LAC) and Mn-peroxidase (MnP), based on their decolorization activity of Remazol Brilliant Blue R (RBBR). In the midst of 20 tested fungi, 9 isolates were shown 4 kinds of activities such as RBBR decolorization, GOD, LAC and MnP. Relatively high active strains were identified as Phlebia radiata, Trametes versicolor, Abortiporus biennis, Gleophyllum odoratum and Cerrena unicolor. In particular, T. versicolor, G. odoratum, and C. unicolor, which have high activities of LAC, were used to confirm the optimal temperature and pH and to evaluate the effect of inducer, 2,5-xylidine on their LAC activity. The optimum temperatures for mycelial growth were $28^{\circ}C$ for T. versicolor and G. odoratum, and $25^{\circ}C$ for C. unicolor. The optimum pH for mycelial growth was 5.5. Three strains showed the increase of LAC enzyme activity by the addition of 2,5-xylidine. T. versicolor had the highest LAC activity of $22,700nkat/{\ell}$, corresponding to 11.3 times, G. odoratum $15,400nkat/{\ell}$, 9 times and C. unicolor $17,330nkat/{\ell}$, 5.5 times higher than those of the control.

본 연구는 Remazol Brilliant Blue R (RBBR) 염료의 탈색능을 이용, 리그닌분해능이 강한 백색부후균을 선발하고, 이들 균주들의 리그닌분해효소의 활성에 미치는 inducer, 2,5-xylidine 첨가효과를 검토하였다. 20종의 공시균주 가운데 9종이 RBBR의 탈색, glucose-1 oxidase (GOD), laccase (LAC) 및 Mn-peroxidase (MnP) 등 4가지의 활성을 모두 가지고 있었으며, 비교적 활성이 높은 5종의 균주는 Phlebia radiata, Trametes versicolor, Abortiporus biennis, Gleophyllum odoratum 및 Cerrena unicolor 등으로 확인되었다. 이들 균주 가운데 LAC 활성이 매우 높은 T. versicolor, G. odoratum 및 C. unicolor에 대한 최적 생육온도, 최적 pH 및 LAC 활성에 미치는 inducer 첨가효과를 조사한 결과, T. versicolor가 $28^{\circ}C$에서, G. odoratum 및 C. unicolor는 $25^{\circ}C$에서 가장 좋은 생장을 보였으며, 모든 균주의 배양 최적 pH는 5.5로 나타났다. 공시균주 모두 2,5-xylidine 첨가에 의하여 LAC 활성의 증가를 보였는데, T. versicolor는 $22,700nkat/{\ell}$로 대조구에 대하여 11.3배, G. odoratum은 최대 활성이 $15,400nkat/{\ell}$로 9배, C. unicolor는 $17,330nkat/{\ell}$로 5.5배의 활성증가를 나타냈다.

Keywords

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