title: Wood utilization is dependent on catalase activities in the filamentous fungus Podospora anserina.
abstract: Catalases are enzymes that play critical roles in protecting cells against the toxic effects of hydrogen peroxide. They are implicated in various physiological and pathological conditions but some of their functions remain unclear. In order to decipher the role(s) of catalases during the life cycle of Podospora anserina, we analyzed the role of the four monofunctional catalases and one bifunctional catalase-peroxidase genes present in its genome. The five genes were deleted and the phenotypes of each single and all multiple mutants were investigated. Intriguingly, although the genes are differently expressed during the life cycle, catalase activity is dispensable during both vegetative growth and sexual reproduction in laboratory conditions. Catalases are also not essential for cellulose or fatty acid assimilation. In contrast, they are strictly required for efficient utilization of more complex biomass like wood shavings by allowing growth in the presence of lignin. The secreted CATB and cytosolic CAT2 are the major catalases implicated in peroxide resistance, while CAT2 is the major player during complex biomass assimilation. Our results suggest that P. anserina produces external H(2)O(2) to assimilate complex biomass and that catalases are necessary to protect the cells during this process. In addition, the phenotypes of strains lacking only one catalase gene suggest that a decrease of catalase activity improves the capacity of the fungus to degrade complex biomass.
authors.affiliation: Institut de Génétique et Microbiologie, Univ Paris-Sud, UMR 8621, Orsay, France.
authors.forename: Anne
authors.initials: A
authors.lastname: Bourdais
authors.forename: Frederique
authors.initials: F
authors.lastname: Bidard
authors.forename: Denise
authors.initials: D
authors.lastname: Zickler
authors.forename: Veronique
authors.initials: V
authors.lastname: Berteaux-Lecellier
authors.forename: Philippe
authors.initials: P
authors.lastname: Silar
authors.forename: Eric
authors.initials: E
authors.lastname: Espagne
mesh_terms: D001483:Base Sequence; D015139:Blotting, Southern; D002374:Catalase / Q000235:genetics* / Q000378:metabolism*; D016000:Cluster Analysis; D017353:Gene Deletion; D020869:Gene Expression Profiling; D006861:Hydrogen Peroxide / Q000378:metabolism*; D008031:Lignin / Q000378:metabolism*; D016013:Likelihood Functions; D008957:Models, Genetic; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction; D010641:Phenotype; D010802:Phylogeny; D048468:Podospora / Q000201:enzymology* / Q000254:growth & development; D016133:Polymerase Chain Reaction; D060888:Real-Time Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D014934:Wood / Q000378:metabolism*
chemical_list: C036909:lignocellulose; D008031:Lignin; D006861:Hydrogen Peroxide; D002374:Catalase