title: Proteomic analyses of Fusarium graminearum grown under mycotoxin-inducing conditions.
abstract: Non-gel-based quantitative proteomics technology was used to profile protein expression differences when Fusarium graminearum was induced to produce trichothecenes in vitro. As F. graminearum synthesizes and secretes trichothecenes early in the cereal host invasion process, we hypothesized that proteins contributing to infection would also be induced under conditions favouring mycotoxin synthesis. Protein samples were extracted from three biological replicates of a time course study and subjected to iTRAQ (isobaric tags for relative and absolute quantification) analysis. Statistical analysis of a filtered dataset of 435 proteins revealed 130 F. graminearum proteins that exhibited significant changes in expression, of which 72 were upregulated relative to their level at the initial phase of the time course. There was good agreement between upregulated proteins identified by 2-D PAGE/MS/MS and iTRAQ. RT-PCR and northern hybridization confirmed that genes encoding proteins which were upregulated based on iTRAQ were also transcriptionally active under mycotoxin producing conditions. Numerous candidate pathogenicity proteins were identified using this technique. These will provide leads in the search for mechanisms and markers of host invasion and novel antifungal targets.
authors.affiliation: Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, Ottawa, Ontario, Canada.
authors.forename: Rebecca D
authors.initials: RD
authors.lastname: Taylor
authors.forename: Audrey
authors.initials: A
authors.lastname: Saparno
authors.forename: Barbara
authors.initials: B
authors.lastname: Blackwell
authors.forename: Valar
authors.initials: V
authors.lastname: Anoop
authors.forename: Steve
authors.initials: S
authors.lastname: Gleddie
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Tinker
authors.forename: Linda J
authors.initials: LJ
authors.lastname: Harris
mesh_terms: D015152:Blotting, Northern; D016000:Cluster Analysis; D015180:Electrophoresis, Gel, Two-Dimensional; D005656:Fungal Proteins / Q000737:chemistry; D005670:Fusarium / Q000378:metabolism*; D015966:Gene Expression Regulation, Fungal; D013058:Mass Spectrometry; D008954:Models, Biological; D015233:Models, Statistical; D009183:Mycotoxins / Q000378:metabolism*; D010935:Plant Diseases / Q000382:microbiology; D010944:Plants / Q000382:microbiology*; D020543:Proteome; D040901:Proteomics / Q000379:methods*; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D005656:Fungal Proteins; D009183:Mycotoxins; D020543:Proteome