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Ceriporia sp. ZLY-2010에 의한 폴리염화비페닐류의 생분해: 균체 외 효소활성 및 cytochrome P450 monooxygenase 영향
Ceriporia sp. ZLY-2010 in Biodegradation of Polychlorinated Biphenyls: Extracellular Enzymes Production and Effects of Cytochrome P450 Monooxygenase
홍창영 ( Chang Young Hong ) , 곽기섭 ( Ki Seob Gwak ) , 이수연 ( Su Yeon Lee ) , 김선홍 ( Seon Hong Kim ) , 정한섭 ( Han Seob Jeong ) , 최인규 ( In Gyu Choi )
UCI I410-ECN-0102-2012-580-003030855

본 연구에서는 Ceriporia sp. ZLY-2010을 이용하여 폴리염화비페닐류의 생분해와 효소 시스템간의 상관관계에 대해 알아보고자 하였다. 폴리염화비페닐 동족체 첨가에 따라 단백질 정량 및 manganese peroxidase (MnP)와 laccase의 활성을 비교하였으며, cytochrome P450 monooxygenase의 저해 정도를 평가함으로써 균체 내 효소가 폴리염화비페닐의 생분해에 끼치는 영향을 규명하였다. 단백질 정량 및 균체 외 효소 활성을 측정해 본 결과, 대조구에 비해 폴리염화비페닐 동족체를 첨가한 실험구에서 단백질 농도 및 효소활성이 더 높게 측정되었다. 단백질 농도의 경우, 2,2`,4,4`,5,5`-hexachlorobiphenyl을 첨가했을 때, 가장 높은 단백질 농도가 측정되었다. 하지만 MnP와 laccase 활성에서는 상대적으로 염소원자가 적게 치환된 2,3`,4`,5-tetrachlorobiphenyl을 첨가한 실험구에서 높게 나타나는 경향을 보였다. Cytochrome P450 monooxygenase의 저해 정도를 평가한 결과, 2,3`,4`,5-tetrachlorobiphenyl을 첨가한 실험구의 경우, 배양 1일째, 저해제 1-aminobenzotriazole 0.1 mM에서 2.73%의 분해율을 나타냈으며, 저해제 첨가 시 생분해율이 크게 감소하는 것으로 나타났다. 2,2`,4,4`,5,5`-hexachlorobiphenyl 역시, 저해제의 존재 하에 20% 내외의 분해율을 보였으며, 이는 대조구에 비해 약 40% 감소한 비율이다.

In this study, to determine the ligninase activity related to the PCBs degradation of Ceriporia sp. ZLY-2010, the protein contents and manganese peroxidase (MnP) and laccase activities during cultivation on shallow stationary culture (SSC) medium were observed. 4 PCB congeners were selected depending on the number of chlorine substituted on biphenyl. Furthermore, to examine the effects of cytochrome P450 monooxygenase, the inhibition of cytochrome P450 monooxygenase was evaluated by measuring the biodegradation rate when inhibitor such as 1-aminobenzotriazole was added. The extracellular protein contents were affected by PCB congeners in culture media. The total protein in the culture medium showed the biggest differences between the samples containing 2,2`,4,4`,5,5`-hexachlorobiphenyl and the control. On the other hand, MnP and laccase activity showed dominant increases within samples containing 4,4`-dichlorobiphenyl and 2,3`,4`,5-tetrachlorobiphenyl. Cytochrome P450 monooxygenase was inhibited by adding inhibitor, 1-aminobenzotriazole in low concentration. Only 2.73% of 2,3`,4`,5-tetrachlorobiphenyl was degraed on day 1, and biodegradation of 2,2`,4,4`,5,5`-hexachlorobiphenyl was inhibited as well, showing about 20% of biodegradation rate.

[자료제공 : 네이버학술정보]
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