title: Plant cell wall degradation with a powerful Fusarium graminearum enzymatic arsenal.
abstract: The complex enzyme pool secreted by the phytopathogenic fungus Fusarium graminearum in response to glucose or hop cell wall material as sole carbon sources was analyzed. The biochemical characterization of the enzymes present in the supernatant of fungal cultures in the glucose medium revealed only 5 different glycosyl hydrolase activities; by contrast, when analyzing cultures in the cell wall medium, 17 different activities were detected. This dramatic increase reflects the adaptation of the fungus by the synthesis of enzymes targeting all layers of the cell wall. When the enzymes secreted in the presence of plant cell wall were used to hydrolyze pretreated crude plant material, high levels of monosaccharides were measured with yields approaching 50% of total sugars released by an acid hydrolysis process. This report is the first biochemical characterization of numerous cellulases, hemicellulases, and pectinases secreted by F. graminearum and demonstrates the usefulness of the described protein cocktail for efficient enzymatic degradation of plant cell wall.
authors: UMR 7175, ESBS, Université Louis Pasteur, F-67413 Ilkirch, Strasbourg, France. phalip@esbs.u-strasbg.fr
authors: Vincent
authors: V
authors: Phalip
authors: Florence
authors: F
authors: Goubet
authors: Raphael
authors: R
authors: Carapito
authors: Jean-Marc
authors: JM
authors: Jeltsch
mesh_terms: D018533:Biomass; D002473:Cell Wall / Q000378:metabolism*; D044602:Cellulases / Q000378:metabolism; D005670:Fusarium / Q000201:enzymology*; D005947:Glucose / Q000378:metabolism; D006026:Glycoside Hydrolases / Q000378:metabolism; D027582:Humulus / Q000378:metabolism* / Q000648:ultrastructure; D007218:Industrial Microbiology; D009844:Oligosaccharides / Q000378:metabolism; D011096:Polygalacturonase / Q000378:metabolism
chemical_list: D009844:Oligosaccharides; D044602:Cellulases; D006026:Glycoside Hydrolases; C023305:hemicellulase; D011096:Polygalacturonase; D005947:Glucose