Contrasting characteristics of anthracene and pyrene degradation by wood rot fungus Pycnoporus sanguineus H1

文献类型： 外文期刊

第一作者： Zhang, Shimin

作者： Zhang, Shimin;Ning, Yongxia;Zhang, Xiaolin;Wu, Kun;Zhao, Yong;Yang, Xitian;Li, Xuanzhen;Li, Xuanzhen;Yang, Suqin;Sun, Xiaoxue;La, Guixiao

作者机构：

关键词： Anthracene;Pyrene;Wood rot fungi;Degradation;Metabolic mechanism;Polycyclic aromatic hydrocarbons

期刊名称：INTERNATIONAL BIODETERIORATION & BIODEGRADATION （ 影响因子：4.32； 五年影响因子：4.719 ）

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收录情况： SCI

摘要： This investigation evaluates the contrasting metabolic characteristics of anthracene and pyrene by wood rot fungus Pycnoporus sanguineus H1. Under in vivo conditions, P. sanguineus H1 degraded 67.5% of the anthracene and showed maximal laccase activity of 1568.2 U L-1. When piperonyl butoxide (PB) was added to the liquid cultures, the anthracene degradation rate increased to 73.1% and maximal laccase activity increased to 2034.3 U L-1. For pyrene, the degradation rate was 31.1%; however, after PB addition, the value decreased to 5.3% while maximal laccase activity increased to 1625.3 U L-1 from 1469.1 U L-1. Under in vitro conditions, the extracellular liquid culture (10 kDa membrane, ultra-filtered) transformed 59.9% of the anthracene, while addition of 2,2'-azinobis(3-ethylbenzthiazoline-6-sulfonate) (ABTS) enhanced the anthracene transformation rate up to 92.0%. The extracellular liquid did not convert the pyrene, however, suggesting that anthracene is modified extracellularly, (likely via laccase) while pyrene is not. Whole mycelium, as well as homogenized mycelium and microsomal proteins, transformed both anthracene and pyrene; conversion was inhibited to some extent by the PB, implying that cytochrome P450 participates in intracellular PAHs transformation. Additional evidence that ABTS enhances anthracene transformation by homogenized mycelium suggests that mycelium-associated laccase cooperates in the intracellular degradation of anthracene. These results altogether elucidate the metabolism of PAHs by P. sanguineus via extracellular laccase, intracellular cytochrome P450, and mycelium-associated laccase. (C) 2015 Elsevier Ltd. All rights reserved.

分类号： Q93

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