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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Enzyme and Microbial Technology; v. 130, NOV 2019.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 17/16089-1 - Produção de correntes de lignina, triagem metagenômica e conversão biocatalítica de lignina em ácido ferúlico
• Beneficiário: Thiago Augusto Gonçalves
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/50590-4 - Valorização da lignina em plantas de etanol celulósico: a conversão biocatalítica via ácido ferúlico a produtos químicos de alto valor
• Beneficiário: Fábio Márcio Squina
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Temático
• Processo FAPESP: 14/06923-6 - Recalcitrância da biomassa de cana-de-açúcar: fundamentos relacionados à formação da parede celular, ao pré-tratamento e à digestão enzimática, aplicados no desenvolvimento de novos modelos de biorrefinarias
• Beneficiário: Andre Luis Ferraz
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Temático