Fusarium sporotrichioides
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REPOSITORIES: ENA
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Project description:UNLABELLED: BACKGROUND:Certain graminaceous plants such as Zea mays and Triticum aestivum serve as hosts for Fusarium sporotrichioides; however, molecular interactions between the host plants and F. sporotrichioides remain unknown. It is also not known whether any interaction between Arabidopsis thaliana and F. sporotrichioides can occur. To understand these interactions, we performed proteomic analysis. RESULTS:Arabidopsis leaves and flowers were inoculated with F. sporotrichioides. Accumulation of PLANT DEFENSIN1.2 (PDF1.2) and PATHOGENESIS RELATED1 (PR1) mRNA in Arabidopsis were increased by inoculation of F. sporotrichioides. Furthermore, mitogen-activated protein kinase 3 (MPK3) and mitogen-activated protein kinase 6 (MPK6), which represent MAP kinases in Arabidopsis, were activated by inoculation of F. sporotrichioides. Proteomic analysis revealed that some defense-related proteins were upregulated, while the expression of photosynthesis- and metabolism-related proteins was down regulated, by inoculation with F. sporotrichioides. We carried out the proteomic analysis about upregulated proteins by inoculation with Fusarium graminearum. The glutathione S-transferases (GSTs), such as GSTF4 and GSTF7 were upregulated, by inoculation with F. graminearum-infected Arabidopsis leaves. On the other hand, GSTF3 and GSTF9 were uniquely upregulated, by inoculation with F. sporotrichioides. CONCLUSIONS:These results indicate that Arabidopsis is a host plant for F. sporotrichioides. We revealed that defense response of Arabidopsis is initiated by infection with F. sporotrichioides.
| S-EPMC3507649 | biostudies-literature
Project description:Fusarium is a genus that mostly consists of plant pathogenic fungi which are able to produce a broad range of toxic secondary metabolites. In this study, we focus on a type A trichothecene-producing isolate (15-39) of Fusarium sporotrichioides from Lower Austria. We assessed the secondary metabolite profile and optimized the toxin production conditions on autoclaved rice and found that in addition to large amounts of T-2 and HT-2 toxins, this strain was able to produce HT-2-glucoside. The optimal conditions for the production of T-2 toxin, HT-2 toxin, and HT-2-glucoside on autoclaved rice were incubation at 12 °C under constant light for four weeks, darkness at 30 °C for two weeks, and constant light for three weeks at 20 °C, respectively. The HT-2-glucoside was purified, and the structure elucidation by NMR revealed a mixture of two alpha-glucosides, presumably HT-2-3-O-alpha-glucoside and HT-2-4-O-alpha-glucoside. The efforts to separate the two compounds by HPLC were unsuccessful. No hydrolysis was observed with two the alpha-glucosidases or with human salivary amylase and Saccharomyces cerevisiae maltase. We propose that the two HT-2-alpha-glucosides are not formed by a glucosyltransferase as they are in plants, but by a trans-glycosylating alpha-glucosidase expressed by the fungus on the starch-containing rice medium.
| S-EPMC10893509 | biostudies-literature
Project description:Fusarium head blight is a devastating disease of cereal crops whose worldwide incidence is increasing and at present there is no satisfactory way of combating this pathogen or its associated toxins. There is a wide variety of trichothecene mycotoxins and they all contain a 12,13-epoxytrichothecene skeleton but differ in their substitutions. Indeed, there is considerable variation in the toxin profile across the numerous Fusarium species that has been ascribed to differences in the presence or absence of biosynthetic enzymes and their relative activity. This article addresses the source of differences in acetylation at the C15 position of the trichothecene molecule. Here, we present the in vitro structural and biochemical characterization of TRI3, a 15-O-trichothecene acetyltransferase isolated from F. sporotrichioides and the "in vivo" characterization of Deltatri3 mutants of deoxynivalenol (DON) producing F. graminearum strains. A kinetic analysis shows that TRI3 is an efficient enzyme with the native substrate, 15-decalonectrin, but is inactive with either DON or nivalenol. The structure of TRI3 complexed with 15-decalonectrin provides an explanation for this specificity and shows that Tri3 and Tri101 (3-O-trichothecene acetyltransferase) are evolutionarily related. The active site residues are conserved across all sequences for TRI3 orthologs, suggesting that differences in acetylation at C15 are not due to differences in Tri3. The tri3 deletion mutant shows that acetylation at C15 is required for DON biosynthesis even though DON lacks a C15 acetyl group. The enzyme(s) responsible for deacetylation at the 15 position of the trichothecene mycotoxins have not been identified.
| S-EPMC2762587 | biostudies-literature
Project description:We screened a Fusarium sporotrichioides NRRL 3299 cDNA expression library in a toxin-sensitive Saccharomyces cerevisiae strain lacking a functional PDR5 gene. Fourteen yeast transformants were identified as resistant to the trichothecene 4,15-diacetoxyscirpenol, and each carried a cDNA encoding the trichothecene 3-O-acetyltransferase that is the F. sporotrichioides homolog of the Fusarium graminearum TRI101 gene. Mutants of F. sporotrichioides NRRL 3299 produced by disruption of TRI101 were altered in their abilities to synthesize T-2 toxin and accumulated isotrichodermol and small amounts of 3, 15-didecalonectrin and 3-decalonectrin, trichothecenes that are not observed in cultures of the parent strain. Our results indicate that TRI101 converts isotrichodermol to isotrichodermin and is required for the biosynthesis of T-2 toxin.
| S-EPMC91713 | biostudies-literature
Project description:Pathogenic fungus (aka Fusarium verticillioides) that produces fumonisin mycotoxins and causes kernel and ear rot of maize
| PRJNA15554 | ENA
Project description:Fusarium Head Blight (FHB) is a disease of wheat and other cereal crops, where Fusarium graminearum and related species infects the wheat inflorescence during and post-anthesis. The fungus produces trichothecene toxins that accumulate in the grain of infected head, and are required for disease spread. Microarrays were used to observe differential gene expression in the uninoculated spikelets of FHB-challenged wheat spikes in three wheat genotypes. A summary of our findings will be published in Plant Pathology.
2011-09-01 | GSE28973 | GEO
Project description:The x-ray crystal structure of recombinant trichodiene synthase from Fusarium sporotrichioides has been determined to 2.5-A resolution, both unliganded and complexed with inorganic pyrophosphate. This reaction product coordinates to three Mg(2+) ions near the mouth of the active site cleft. A comparison of the liganded and unliganded structures reveals a ligand-induced conformational change that closes the mouth of the active site cleft. Binding of the substrate farnesyl diphosphate similarly may trigger this conformational change, which would facilitate catalysis by protecting reactive carbocationic intermediates in the cyclization cascade. Trichodiene synthase also shares significant structural similarity with other sesquiterpene synthases despite a lack of significant sequence identity. This similarity indicates divergence from a common ancestor early in the evolution of terpene biosynthesis.
| S-EPMC61077 | biostudies-literature
Project description:An acetyltransferase gene (Tri3) was isolated from Fusarium sporotrichioides by complementation of a previously identified Tri3- mutant and shown to be closely linked to three other trichothecene biosynthetic pathway genes. Comparison of the Tri3 sequence with its cDNA revealed the presence of four introns. The Tri3 cDNA contains a 1,539-bp open reading frame that encodes a protein with a molecular mass of 57,418 Da. Regulation of Tri3 transcription in liquid cultures appeared identical to that of other trichothecene pathway genes. Disruption of the Tri3 gene resulted in the accumulation of deacetylated calonectrins rather than T-2 toxin. The results of whole-cell feeding experiments with Tri3- strains suggested that 15-O-acetylation is blocked. Cell-free feeding experiments confirmed that Tri3- strains are able to acetylate a trichothecene C-3 hydroxyl group but are unable to acetylate a trichothecene C-15 hydroxyl group. Our results show that Tri3 encodes an acetyltransferase that converts 15-decalonectrin to calonectrin.
| S-EPMC167806 | biostudies-other