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Title: What Basidiomycete Genomes Teach us about Wood Biodegradation Mechanisms

Source: In: Proceedings EWLP, 13th European Workshop on Lignocellulosics and Pulp, 24-27 June 2014 Seville, Spain, 2014; pp. 111-114.

Author(s)Ruiz-Dueñas, Francisco J.; Fernández-Fueyo, Elena; Barrasa, José M.; Hammel, Kenneth E.; Martinez, Angel T.

Publication Year: 2014  View PDF »

Category: Conference Proceedings
Associated Research Project(s):   FPL-4712-2B

Abstract: Considerable confusion existed for years about the mechanisms ultimately responsible for wood biodegradation by basidiomycetes. Interest in wood decay, as a biotechnological model for the sustainable production of fuels and chemicals, led to sequencing of the first basidiomycete genomes. Massive sequencing tools extended the number of white-rot and brown-rot fungal genomes available, enabling us to establish general conclusions on the biodegradation mechanisms involved in each of them. Lignin degradation by white-rot fungi appears always associated with the presence of high redox-potential peroxidase genes in their genomes. Such genes are absent from all the brown-rot fungal genomes. Moreover, polysaccharide degradation by the latter fungi is not associated with an expansion of genes encoding carbohydrate-acting enzymes. This fact, together with the presence of genes encoding peroxide-generating and Fe3+- and quinone-reducing enzymes, supports the chemical depolymerization of wood polysaccharides via Fenton chemistry in the case of brown rot. The genomic analyses also outlined the evolutionary history of the different peroxidase families in wood-rotting basidiomycetes, in particular fixing the origin of lignin-degrading peroxidases at the end of the Carboniferous period, which coincides with the end of coal formation via accumulation of undecayed plant biomass in the soil.

Keywords: White rot; Brown rot

Publication Review Process: Non-Refereed (Other)

File size: 747 kb(s)

Date posted: 10/01/2014
RITS Product ID: 70118
Current FPL Scientist associated with this product
Hammel, Kenneth E.
Research Chemist
  

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