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首页> 外文会议>American Chemical Society >The Role of Enzymes and Mediators in White-Rot Fungal Degradation of Lignocellulose
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The Role of Enzymes and Mediators in White-Rot Fungal Degradation of Lignocellulose

机译：酶和介质在木质纤维素的白腐真菌降解中的作用

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White-rot fungi can selectively and efficiently degrade lignin through the action of secreted enzymes. Major lignin-degrading enzymes include lignin peroxidase (LiP), manganese peroxidase (MnP) and laccase. LiP and MnP require hydrogen peroxide (H_2O_2) for their activities, but they are inactivated by a high concentration of H_2O_2. There are various H_2O_2-producing enzymes in white-rot fungi. LiP is able to oxidize both phenolic and non-phenolic lignin substructures, whereas MnP and laccase are only able to degrade phenolic lignin substructures. An unsaturated fatty acid or a thio-containing compound enables MnP to degrade non-Phenolic lignin substructures. Several in vitro studies reveal that some enzymes can synergistically degrade lignin. As lignin-degrading enzymes are too bulk to penetrate plant cell walls for lignin degradation, the role of various small organic/inorganic compounds, serving as redox mediators for lignin-degrading enzymes in lignin degradation, is discussed in detail.
机译：白腐真菌可以通过分泌酶的作用选择性和有效地降解木质素。主要的木质素降解酶包括木质素过氧化物酶（唇），锰过氧化物酶（MNP）和漆酶。唇缘和MNP需要过氧化氢（H_2O_2）的活性，但它们通过高浓度的H_2O_2而灭活。白腐真菌有各种H_2O_2产生酶。唇缘能够氧化酚类和非酚醛木质素的子结构，而MNP和漆酶仅能够降解酚类木质素亚结构。不饱和脂肪酸或含硫醇的化合物使MNP能够降解非酚类木质素亚结构。几种体外研究表明，一些酶可以协同降解木质素。随着木质素降解的酶太散装以穿透植物细胞壁用于木质素降解，各种小有机/无机化合物的作用，用作木质素降解中木质素降解的氧化还原介质的氧化还原介质。

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