Abstract
The development of alternative energy sources by applying lignocellulose-based biofuel technology is critically important because of the depletion of fossil fuel resources, rising fossil fuel prices, security issues regarding the fossil fuel supply, and environmental issues. White-rot fungi have received much attention in recent years for their valuable enzyme systems that effectively degrade lignocellulosic biomasses. These fungi have powerful extracellular oxidative and hydrolytic enzymes that degrade lignin and cellulose biopolymers, respectively. Lignocellulosic biomasses from either agricultural or forestry wastes are abundant, low-cost feedstock alternatives in nature but require hydrolysis into simple sugars for biofuel production. This review provides a complete overview of the different lignocellulose biomasses and their chemical compositions. In addition, a complete list of the white-rot fungi-derived lignocellulolytic enzymes that have been identified and their molecular structures, mechanism of action in lignocellulose hydrolysis, and biochemical properties is summarized in detail. These enzymes include ligninolytic enzymes (laccase, manganese peroxidase, lignin peroxidase, and versatile peroxidase) and cellulolytic enzymes (endo-glucanase, cellobiohydrolase, and beta-glucosidase). The use of these fungi for low-cost lignocellulolytic enzyme production might be attractive for biofuel production.
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