Secretome analysis of Phanerochaete chrysosporium strain CIRM-BRFM41 grown on softwood

• Published in: Applied microbiology and biotechnology 2008-09, Vol.80 (4), p.719-733, Article 719
• Main Authors: Ravalason, Holy, Jan, Gwénaël, Mollé, Daniel, Pasco, Maryvonne, Coutinho, Pedro M, Lapierre, Catherine, Pollet, Brigitte, Bertaud, Frédérique, Petit-Conil, Michel, Grisel, Sacha, Sigoillot, Jean-Claude, Asther, Marcel, Herpoël-Gimbert, Isabelle
• Format: Article
• Language: English
• Subjects: Amino Acid Sequence; Biological and medical sciences; Biotechnology; Bleaching; Carbon; Cellulose; chemical pulping; Chlorine; Electrophoresis, Gel, Two-Dimensional; Enzymes; Extracellular Space - chemistry; Extracellular Space - genetics; Extracellular Space - metabolism; Fundamental and applied biological sciences. Psychology; Fungal Proteins - chemistry; Fungal Proteins - genetics; Fungal Proteins - metabolism; Fungi; Genomes; Genomics; Genomics and Proteomics; Industrial Microbiology; Ionization; Life Sciences; Lignin; Lignin - chemistry; Lignin - metabolism; Lignocellulose; Mass spectrometry; Microbial Genetics and Genomics; Microbiology; Molecular Sequence Data; Phanerochaete - chemistry; Phanerochaete - genetics; Phanerochaete - metabolism; Phanerochaete chrysosporium; Protein Transport; Proteins; Proteomics; Secretome; softwood; Softwoods; Studies; Wood; Wood - chemistry; Wood - metabolism; Wood sciences
• ISSN: 0175-7598; 1432-0614
• DOI: 10.1007/s00253-008-1596-x

Proteomic analysis was performed to determine and differentiate the composition of the secretomes of Phanerochaete chrysosporium CIRM-BRFM41, a peroxidase hypersecretory strain grown under ligninolytic conditions and on softwood chips under biopulping conditions. Extracellular proteins from both cultures were analyzed by bidimensional gel electrophoresis and matrix-assisted laser desorption/ionization time-of-flight tandem mass spectrometry. A total of 37 spots were identified. The secretome in liquid synthetic medium comprised mainly peroxidases, while several wood-degrading enzymes and enzymes involved in fungal metabolism were detected in biopulping cultures on softwood. This prompted an analysis of the impact of secretome modulation in the presence of softwood chips. Biotreated wood was submitted to kraft cooking and chemical bleaching using chlorine dioxide. The fungal pre-treatment led to a significant increase in pulp yield and a better bleachability of the pulp. This bleachability improvement could be explained by the production of specific lignocellulose-degrading enzymes.