• Journal of the Korean Wood Science and Technology
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• 제29권3호
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• pp.104-111
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• 2001

There are some evidence that active enzymatic proteins, e.g. fungal laccase, exist in the naturally occured soil humus. This study was performed to investigate the covalent binding of fungal laccase to the humic acid-iron complex, and to measure laccase activity of immobilized ones. Seven methods were adopted to form the covalent binding of fungal laccase with soil humic acids complexed with iron. Using these seven methods it was possible to change the dimension of spacer arm between laccase and support, and also to regulate the mode of covalent binding of this enzyme. The spacer arm was regulated from 2C to 11C. There was not observed any straight relationship between the spacer arm longitude and the laccase activity after immobilization, but the binding mode more effective than the former. Three out of the seven methods gave the high activity of immobilized laccase, and which active products of laccase immobilization was stable up to 10 days after the process. It is indicated that natural soil condition might be prevented the laccase activation by the toxic influence of some phenolic humic compounds. It was shown, for the first time, the possibilities to obtain the high activity of fungal laccase by binding to humic acids, and especially in complex with iron.

• Bulletin of the Korean Chemical Society
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• 제25권10호
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• pp.1551-1554
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• 2004

In the presence of laccase, low molecular weight (M.W.) fractions from lignosulfonate (M.W. 97 kD) were produced. By Sephadex column chromatography, four lower M.W. fractions of 9 kD, 1.8 kD, 1 kD and 0.85 kD were identified. The addition of acetovanillone (AV) or acetosyringone (AS) enhanced to the degradation of lignosulfonate with fungal laccase. During this process, there were found new generation of lower M.W. fractions, e.g. approximately 20 kD, 1.8 kD, 1 kD and 0.85 kD for AV, and 20 kD, 3 kD, 1 kD and 0.85 kD for AS, respectively. The quantities of lower M.W. products (especially the fractions of M.W. 1 kD and 0.85 kD) were larger than those in the controls. Also, its degradation became more active in the presence of AS than AV. The presence of AS or AV seems to prevent the re-polymerization of degraded lignosulfonate by the laccase.

• 한국균학회지
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• 제40권2호
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• pp.98-103
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• 2012

본 연구에서는 백색부후균 중 줄버섯, 단색털구름버섯, 산느타리 및 유관버섯 등의 균사체를 이용하여 congo red, amaranth, orange G 및 methylene blue 등의 합성염료 탈색에 관한 실험을 수행하였다. 실험 결과 줄버섯과 단색털구름버섯은 congo red가 함유된 고체와 액체배지에서 이들 염료를 93~95% 탈색하였으며 amaranth는 약 80%, orange G는 62~70% 탈색시키는 것으로 나타났으나 유관버섯에 의한 3종류의 염료 탈색율은 30% 내외로 매우 낮았다. congo red, amaranth 및 orange G 등 각각의 염료가 첨가된 배지에서의 염료 탈색율은 이들 배지에서 배양한 균사체의 생장과 상관관계가 있는 것으로 나타났다. 그러나 모든 공시 균주는 methylene blue가 함유된 고체와 액체배지에서 methylene blue를 효과적으로 탈색하지 못하는 것으로 나타났다. 공시된 백색부후균의 액체 배지에서의 리그닌 분해효소 생산을 탐색하기 위해 1%의 나프탈렌이 첨가된 PDB 배지에 공시균을 10일 간 배양 후 효소의 종류와 양을 분석한 결과 모든 공시균은 laccase, lignin peroxidase 그리고 manganese peroxidase 등의 효소를 생산하는 것으로 확인되었으며 공시균주 중 줄버섯이 리그닌 분해 효소의 생산이 가장 왕성한 것으로 나타났다.