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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The secretome of two representative lignocellulose-decay basidiomycetes growing on sugarcane bagasse solid-state cultures

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Author(s):
Valadares, Fernanda [1] ; Goncalves, Thiago A. [2, 3] ; Damasio, Andre [3] ; Milagres, Adriane M. F. [1] ; Squina, Fabio M. [2] ; Segato, Fernando [1] ; Ferraz, Andre [1]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, Escola Engn Lorena, Dept Biotecnol, BR-12602810 Lorena, SP - Brazil
[2] Univ Sorocaba, Programa Proc Tecnol & Ambientais, BR-18023000 Sorocaba, SP - Brazil
[3] Univ Carnpinas UNICAMP, Inst Biol, BR-13080655 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Enzyme and Microbial Technology; v. 130, NOV 2019.
Web of Science Citations: 0
Abstract

Secretome evaluations of lignocellulose-decay basidiomycetes can reveal new enzymes in selected fungal species that degrade specific substrates. Proteins discovered in such studies can support biorefinery development. Brown-rot (Gloeophyllum trabeum) and white-rot (Pleurotus ostreatus) fungi growing in sugarcane bagasse solidstate cultures produced 119 and 63 different extracellular proteins, respectively. Several of the identified enzymes are suitable for in vitro biomass conversion, including a range of cellulases (endoglucanases, cellobiohydrolases and beta-glucosidases), hemicellulases (endoxylanases, alpha-arabinofuranosidases, alpha-glucuronidases and acetylxylan esterases) and carbohydrate-active auxiliary proteins, such as AA9 lytic polysaccharide monooxygenase, AA1 laccase and AA2 versatile peroxidase. Extracellular oxalate decarboxylase was also detected in both fungal species, exclusively in media containing sugarcane bagasse. Interestingly, intracellular AA6 quinone oxidoreductases were also exclusively produced under sugarcane bagasse induction in both fungi. These enzymes promote quinone redox cycling, which is used to produce Fenton's reagents by lignocellulose-decay fungi. Hitherto undiscovered hypothetical proteins that are predicted in lignocellulose-decay fungi genomes appeared in high relative abundance in the cultures containing sugarcane bagasse, which suggests undisclosed, new biochemical mechanisms that are used by lignocellulose-decay fungi to degrade sugarcane biomass. In general, lignocellulose-decay fungi produce a number of canonical hydrolases, as well as some newly observed enzymes, that are suitable for in vitro biomass digestion in a biorefinery context. (AU)

FAPESP's process: 17/16089-1 - Production of lignin chains, metagenomic screening and biocatalytic conversion of lignin to ferulic acid
Grantee:Thiago Augusto Gonçalves
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 15/50590-4 - Lignin valorization in cellulosic ethanol plants: biocatalytic conversion via ferulic acid to high value chemicals
Grantee:Fábio Márcio Squina
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants
FAPESP's process: 14/06923-6 - Sugar cane biomass recalcitrance: basic knowledge related to the cell wall construction, pretreatment and enzymatic digestion, applied for the development of innovative biorefinery models
Grantee:Andre Luis Ferraz
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants