Genome and secretome of Chondrostereum purpureum correspond to saprotrophic and phytopathogenic life styles
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Reina R, Kellner H, Hess J, Jehmlich N, García-Romera I, Aranda E, et al. (2019) Genome and secretome of Chondrostereum purpureum correspond to saprotrophic and phytopathogenic life styles. PLoS ONE 14(3): e0212769. [https://doi. org/10.1371/journal.pone.0212769]
PatrocinadorThe work was financially and scientifically supported by the European Union [integrated projects INDOX – KBBE-7-2013-613549; ENZOX2 – 720297], by the DFG project PeroxiDiv HO 1961/8-1 and the AiF project PeroxyMEER IGF 19636 BG/3. The work has been partly funded by the DFG Priority Program 1374 "Infrastructure-Biodiversity-Exploratories" with the projects HO 1961/6-1, KE 1742/2-1 and JE 724/7-4 (AOBJ: 635952) and the Spanish Ministry of Economy and Competitiveness [project AGL2012-32873]. RR thanks the JAE-Program of the Spanish National Research Council [CSIC] and EA thanks MINECO and FEDER Co-Funds [RyC-2013-12481].
The basidiomycete Chondrostereum purpureum (Silverleaf fungus) is a saprotroph and plant pathogen commercially used for combatting forest “weed” trees in vegetation management. However, little is known about its lignocellulose-degrading capabilities and the enzymatic machinery that is responsible for the degradative potential, and it is not yet clear to which group of wood-rot fungi it actually belongs. Here, we sequenced and analyzed the draft genome of C. purpureum (41.2 Mbp) and performed a quantitative proteomic approach during growth in submerged and solid-state cultures based on soybean meal suspension or containing beech wood supplemented with phenol-rich olive mill residues, respectively. The fungus harbors characteristic lignocellulolytic hydrolases (GH6 and GH7) and oxidoreductases (e.g. laccase, heme peroxidases). High abundance of some of these genes (e.g. 45 laccases, nine GH7) can be explained by gene expansion, e.g. identified for the laccase orthogroup ORTHOMCL11 that exhibits a total of 18 lineage-specific duplications. Other expanded genes families encode for proteins more related to a pathogenic lifestyle (e.g. protease and cytochrome P450s). The fungus responds to the presence of complex growth substrates (lignocellulose, phenolic residues) by the secretion of most of these lignocellulolytic and lignin-modifying enzymes (e.g. alcohol and aryl alcohol oxidases, laccases, GH6, GH7). Based on the genetic and enzymatic constitution, we consider the ‘marasmioid’ fungus C. purpureum as a ‘phytopathogenic’ white-rot fungus (WRF) that possesses a complex extracellular enzyme machinery to accomplish efficient lignocellulose degradation during both saprotrophic and phytopathogenic life phases.