title: A gene related to yeast HOS2 histone deacetylase affects extracellular depolymerase expression and virulence in a plant pathogenic fungus.
abstract: A gene, HDC1, related to the Saccharomyces cerevisiae histone deacetylase (HDAC) gene HOS2, was isolated from the filamentous fungus Cochliobolus carbonum, a pathogen of maize that makes the HDAC inhibitor HC-toxin. Engineered mutants of HDC1 had smaller and less septate conidia and exhibited an approximately 50% reduction in total HDAC activity. Mutants were strongly reduced in virulence as a result of reduced penetration efficiency. Growth of hdc1 mutants in vitro was normal on glucose, slightly decreased on sucrose, and reduced by 30 to 73% on other simple and complex carbohydrates. Extracellular depolymerase activities and expression of the corresponding genes were downregulated in hdc1 mutant strains. Except for altered conidial morphology, the phenotypes of hdc1 mutants were similar to those of C. carbonum strains mutated in ccSNF1 encoding a protein kinase necessary for expression of glucose-repressed genes. These results show that HDC1 has multiple functions in a filamentous fungus and is required for full virulence of C. carbonum on maize.
authors.affiliation: Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI 48824, USA.
authors.forename: D
authors.initials: D
authors.lastname: Baidyaroy
authors.forename: G
authors.initials: G
authors.lastname: Brosch
authors.forename: J H
authors.initials: JH
authors.lastname: Ahn
authors.forename: S
authors.initials: S
authors.lastname: Graessle
authors.forename: S
authors.initials: S
authors.lastname: Wegener
authors.forename: N J
authors.initials: NJ
authors.lastname: Tonukari
authors.forename: O
authors.initials: O
authors.lastname: Caballero
authors.forename: P
authors.initials: P
authors.lastname: Loidl
authors.forename: J D
authors.initials: JD
authors.lastname: Walton
mesh_terms: D000595:Amino Acid Sequence; D001203:Ascomycota / Q000201:enzymology / Q000235:genetics / Q000472:pathogenicity*; D050260:Carbohydrate Metabolism; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics; D005800:Genes, Fungal; D006026:Glycoside Hydrolases / Q000378:metabolism; D006655:Histone Deacetylases / Q000145:classification / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D010456:Peptides, Cyclic / Q000037:antagonists & inhibitors; D010641:Phenotype; D010802:Phylogeny; D010935:Plant Diseases; D018515:Plant Leaves / Q000382:microbiology; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism; D029702:Schizosaccharomyces pombe Proteins; D016415:Sequence Alignment; D014774:Virulence / Q000235:genetics / Q000502:physiology; D003313:Zea mays / Q000187:drug effects / Q000254:growth & development / Q000382:microbiology*
chemical_list: D005656:Fungal Proteins; C421189:Hos2 protein, S pombe; D010456:Peptides, Cyclic; D029702:Schizosaccharomyces pombe Proteins; C037654:HC toxin; D006026:Glycoside Hydrolases; D006655:Histone Deacetylases