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Navarro D, Rosso MN, Haon M, et al. Fast solubilization of recalcitrant cellulosic biomass by the basidiomycete fungus Laetisaria arvalis involves successive secretion of oxidative and hydrolytic enzymes. Biotechnol Biofuels. 2014;7(1):143doi: 10.1186/s13068-014-0143-5.
Navarro, D., Rosso, M. N., Haon, M., Olivé, C., Bonnin, E., Lesage-Meessen, L., Chevret, D., Coutinho, P. M., Henrissat, B., & Berrin, J. G. (2014). Fast solubilization of recalcitrant cellulosic biomass by the basidiomycete fungus Laetisaria arvalis involves successive secretion of oxidative and hydrolytic enzymes. Biotechnology for biofuels, 7(1), 143. https://doi.org/10.1186/s13068-014-0143-5
Navarro, David, et al. "Fast solubilization of recalcitrant cellulosic biomass by the basidiomycete fungus Laetisaria arvalis involves successive secretion of oxidative and hydrolytic enzymes." Biotechnology for biofuels vol. 7,1 (2014): 143. doi: https://doi.org/10.1186/s13068-014-0143-5
Navarro D, Rosso MN, Haon M, Olivé C, Bonnin E, Lesage-Meessen L, Chevret D, Coutinho PM, Henrissat B, Berrin JG. Fast solubilization of recalcitrant cellulosic biomass by the basidiomycete fungus Laetisaria arvalis involves successive secretion of oxidative and hydrolytic enzymes. Biotechnol Biofuels. 2014 Oct 08;7(1):143. doi: 10.1186/s13068-014-0143-5. eCollection 2014. PMID: 25320637; PMCID: PMC4197297.
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Biotechnol Biofuels. 2014 Oct 08;7(1):143. doi: 10.1186/s13068-014-0143-5. eCollection 2014.

Fast solubilization of recalcitrant cellulosic biomass by the basidiomycete fungus Laetisaria arvalis involves successive secretion of oxidative and hydrolytic enzymes.

Biotechnology for biofuels

David Navarro, Marie-Noëlle Rosso, Mireille Haon, Caroline Olivé, Estelle Bonnin, Laurence Lesage-Meessen, Didier Chevret, Pedro M Coutinho, Bernard Henrissat, Jean-Guy Berrin

Affiliations

  1. INRA, UMR1163 Biotechnologie des Champignons Filamenteux, 13288 Marseille, France ; Aix-Marseille Université, Polytech Marseille, UMR1163 Biotechnologie des Champignons Filamenteux, 13288 Marseille, France ; CIRM-CF, UMR1163 Biotechnologie des Champignons Filamenteux, 13288 Marseille, France.
  2. INRA, UMR1163 Biotechnologie des Champignons Filamenteux, 13288 Marseille, France ; Aix-Marseille Université, Polytech Marseille, UMR1163 Biotechnologie des Champignons Filamenteux, 13288 Marseille, France.
  3. INRA, Unité de Recherche Biopolymères, Interactions, Assemblages, 44316 Nantes, France.
  4. INRA, UMR1319 Micalis, Plateforme d'Analyse Protéomique de Paris Sud-Ouest, 78352 Jouy-en-Josas, France.
  5. CNRS, UMR7257 Architecture et Fonction des Macromolécules Biologiques, 13288 Marseille, France ; Aix-Marseille Université, UMR7257 Architecture et Fonction des Macromolécules Biologiques, 13288 Marseille, France.
  6. Aix-Marseille Université, UMR7257 Architecture et Fonction des Macromolécules Biologiques, 13288 Marseille, France ; Department of Biological Sciences, King Abdulaziz University, Abdullah Sulayman, Jeddah, 22254 Saudi Arabia.

PMID: 25320637 PMCID: PMC4197297 DOI: 10.1186/s13068-014-0143-5

Abstract

BACKGROUND: Enzymatic breakdown of lignocellulosic biomass is a known bottleneck for the production of high-value molecules and biofuels from renewable sources. Filamentous fungi are the predominant natural source of enzymes acting on lignocellulose. We describe the extraordinary cellulose-deconstructing capacity of the basidiomycete Laetisaria arvalis, a soil-inhabiting fungus.

RESULTS: The L. arvalis strain displayed the capacity to grow on wheat straw as the sole carbon source and to fully digest cellulose filter paper. The cellulolytic activity exhibited in the secretomes of L. arvalis was up to 7.5 times higher than that of a reference Trichoderma reesei industrial strain, resulting in a significant improvement of the glucose release from steam-exploded wheat straw. Global transcriptome and secretome analyses revealed that L. arvalis produces a unique repertoire of carbohydrate-active enzymes in the fungal taxa, including a complete set of enzymes acting on cellulose. Temporal analyses of secretomes indicated that the unusual degradation efficiency of L. arvalis relies on its early response to the carbon source, and on the finely tuned sequential secretion of several lytic polysaccharide monooxygenases and hydrolytic enzymes targeting cellulose.

CONCLUSIONS: The present study illustrates the adaptation of a litter-rot fungus to the rapid breakdown of recalcitrant plant biomass. The cellulolytic capabilities of this basidiomycete fungus result from the rapid, selective and successive secretion of oxidative and hydrolytic enzymes. These enzymes expressed at critical times during biomass degradation may inspire the design of improved enzyme cocktails for the conversion of plant cell wall resources into fermentable sugars.

Keywords: Bioenergy; Biorefinery; Carbohydrate-active enzymes; Cellulose; Filamentous fungi; Lytic polysaccharide monooxygenase (LPMO)

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