Closely related fungi employ diverse enzymatic strategies to degrade plant biomass

Biotechnology for Biofuels

Isabelle Benoit⁹  Helena Culleton⁷  Miaomiao Zhou⁵  Marcos DiFalco⁸  Guillermo Aguilar-Osorio¹  Evy Battaglia⁹  Ourdia Bouzid⁹  Carlo P J M Brouwer⁵  Hala B O El-Bushari⁹  Pedro M Coutinho³  Birgit S Gruben⁹  Kristiina S Hildén⁴  Jos Houbraken⁵  Luis Alexis Jiménez Barboza⁴  Anthony Levasseur⁶  Eline Majoor⁵  Miia R Mäkelä⁴  Hari-Mander Narang⁵  Blanca Trejo-Aguilar⁹  Joost van den Brink⁵  Patricia A vanKuyk⁵  Ad Wiebenga⁵  Vincent McKie⁷  Barry McCleary⁷  Adrian Tsang⁸  Bernard Henrissat²  Ronald P de Vries⁹ 

[1] Department of Food Science and Biotechnology, Faculty of Chemistry, National University of México, UNAM, Cd. Universitaria, Mexico, C.P. 04510, DF, Mexico

[2] Architecture et Fonction des Macromolécules Biologiques, Aix-Marseille Université, Marseille, 13288, France

[3] CNRS, UMR7257, Aix-Marseille University, Marseille, 13288, France

[4] Division of Microbiology and Biotechnology, Department of Food and Environmental Sciences, Viikki Biocenter 1, University of Helsinki, Helsinki, Finland

[5] Fungal Physiology, CBS-KNAW Fungal Biodiversity Centre and Fungal Molecular Physiology, Utrecht University, Uppsalalaan 8, Utrecht, 3584 CT, The Netherlands

[6] INRA, UMR1163 de Biotechnologie des Champignons Filamenteux, ESIL, Marseille, France

[7] Megazyme International Ireland, IDA Business Park, Bray, Wicklow, Ireland

[8] Centre for Structural and Functional Genomics, Concordia University, 7141 Sherbrooke Street West, Montreal H4B 1R6, QC, Canada

[9] Microbiology and Kluyver Centre for Genomics of Industrial Fermentation, Utrecht University, Padualaan 8, Utrecht, 3584 CH, The Netherlands

关键词: Plant biomass degradation;    Diversity;    Saccharification;    Biofuel;    Polysaccharides;    Enzyme production;    Aspergillus;   

Others  :  1225780
DOI  :  10.1186/s13068-015-0285-0

 received in 2015-04-07, accepted in 2015-07-09,  发布年份 2015

【 摘 要 】

Background

Plant biomass is the major substrate for the production of biofuels and biochemicals, as well as food, textiles and other products. It is also the major carbon source for many fungi and enzymes of these fungi are essential for the depolymerization of plant polysaccharides in industrial processes. This is a highly complex process that involves a large number of extracellular enzymes as well as non-hydrolytic proteins, whose production in fungi is controlled by a set of transcriptional regulators. Aspergillus species form one of the best studied fungal genera in this field, and several species are used for the production of commercial enzyme cocktails.

Results

It is often assumed that related fungi use similar enzymatic approaches to degrade plant polysaccharides. In this study we have compared the genomic content and the enzymes produced by eight Aspergilli for the degradation of plant biomass. All tested Aspergilli have a similar genomic potential to degrade plant biomass, with the exception of A. clavatus that has a strongly reduced pectinolytic ability. Despite this similar genomic potential their approaches to degrade plant biomass differ markedly in the overall activities as well as the specific enzymes they employ. While many of the genes have orthologs in (nearly) all tested species, only very few of the corresponding enzymes are produced by all species during growth on wheat bran or sugar beet pulp. In addition, significant differences were observed between the enzyme sets produced on these feedstocks, largely correlating with their polysaccharide composition.

Conclusions

These data demonstrate that Aspergillus species and possibly also other related fungi employ significantly different approaches to degrade plant biomass. This makes sense from an ecological perspective where mixed populations of fungi together degrade plant biomass. The results of this study indicate that combining the approaches from different species could result in improved enzyme mixtures for industrial applications, in particular saccharification of plant biomass for biofuel production. Such an approach may result in a much better improvement of saccharification efficiency than adding specific enzymes to the mixture of a single fungus, which is currently the most common approach used in biotechnology.

【 授权许可】

   
2015 Benoit et al.

【 图 表 】

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