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Myceliophthora thermophila Xyr1 is predominantly involved in xylan degradation and xylose catabolism

ABSTRACT: Myceliophthora thermophila Xyr1 is predominantly involved in xylan degradation and xylose catabolism

PROVIDER: PRJNA565008 | ENA |

REPOSITORIES: ENA

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Myceliophthora thermophila Xyr1 is predominantly involved in xylan degradation and xylose catabolism

Project description:The aim of this study is to investigate the role of the transcription factor Xyr1 in the regulation of cellulolytic and xylanolytic genes of the filamantous fungus Myceliophthora thermophila

2019-09-12 | GSE137286 | GEO

<i>Myceliophthora thermophila</i> Xyr1 is predominantly involved in xylan degradation and xylose catabolism.

Project description: Not available

| S-EPMC6745793 | biostudies-literature

Myceliophthora

Project description:Myceliophthora sp. overview

| PRJNA267029 | ENA

Growth, enzymatic, and transcriptomic analysis of xyr1 deletion reveals a major regulator of plant biomass-degrading enzymes in Trichoderma harzianum

Project description:The regulation of plant biomass degradation by fungi is critical to the carbon cycle, and applications in bioproducts and biocontrol. Trichoderma harzianum is an important plant biomass degrader, enzyme producer, and biocontrol agent, but few putative major transcriptional regulators have been deleted in this species. The T. harzianum ortholog of the transcriptional activator XYR1/XlnR/XLR-1 was deleted, and the mutant strains were analyzed by growth profiling, enzymatic activities, and transcriptomics on cellulose. From plate cultures, the Δxyr1 mutant had reduced growth on D-xylose, xylan, and cellulose, and from shake-flask cultures with cellulose, the Δxyr1 mutant had ~ 90% lower β-glucosidase activity, and no detectable β-xylosidase or cellulase activity. The comparison of the transcriptomes from 18 h shake-flask cultures on D-fructose, without a carbon source, and cellulose, showed major effects of XYR1 deletion whereby the Δxyr1 mutant on cellulose was transcriptionally most similar to the cultures without a carbon source. The cellulose induced 43 plant biomass-degrading CAZymes including xylanases as well as cellulases, and most of these had massively lower expression in the Δxyr1 mutant. Expression of a sub-set of carbon catabolic enzymes, other transcription factors, and sugar transporters was also lower in the Δxyr1 mutant on cellulose. In summary, T. harzianum XYR1 is the master regulator of cellulases and xylanases, as well as regulating carbon catabolic enzymes.

2023-12-26 | GSE252008 | GEO

Proteome analysis of Polaribacter sp. Q13 cells cultivated on mixed-linkage (β1,3/1,4-xylan), xylose and glucose

Project description:A xylan ulitization locus in Polaribacter sp. Q13, named XUL-Q13, was predicted to be involved in mixed-linkage xylan utilization. To support this, Polaribacter sp. Q13 was cultivated separately in triplicates on mixed-linkage xylan (MX_1, MX_2, MX_3), xylose (X_1, X_2, X_3) and glucose (G_1, G_2, G_3) and their proteomes were analyzed. In addition, the proteome of the resting cells (T0) was also analyzed.

2023-12-14 | PXD035342 | Pride

Sexual crossing of thermophilic fungus Myceliophthora heterothallica improved enzymatic degradation of sugar beet pulp

Project description:Enzymatic degradation of plant biomass requires a complex mixture of many different enzymes. Like most fungi, thermophilic Myceliophthora species therefore have a large set of enzymes targeting different linkages in plant polysaccharides. The majority of these enzymes have not been functionally characterized and their role in plant biomass degradation is unknown. This study describes a strategy using sexual crossing and screening with the thermophilic fungus Myceliophthora heterothallica to identify specific enzymes associated with improved sugar beet pulp saccharification.Two genetically diverse M. heterothallica strains CBS 203.75 and CBS 663.74 were used to generate progenies with improved growth on sugar beet pulp. One progeny, named SBP.F1.2.11, had a different genetic pattern from the parental strains, and had improved saccharification activity after growth on 3% sugar beet pulp. Exo-proteome analysis of progeny and parental strains after 7 days growth on sugar beet pulp showed that only 17 of the 133 secreted CAZy enzymes were more abundant in progeny SBP.F1.2.11. Particularly one enzyme belonging to the carbohydrate esterase family 5 (CE5) was more present in SBP.F1.2.11. This CE5-CBM1 enzyme, named as Axe1, was phylogenetically related to acetyl xylan esterases.

2016-02-25 | PXD003130 | Pride

Aspergillus niger WT: Control vs. xylan induction

2010-10-21 | GSE24848 | GEO

Transcriptomic and proteomic analyses of Clostridium termitidis CT1112 during growth on ?-cellulose, xylan, cellobiose and xylose.

Project description:High throughput “omics technologies” such as transcriptomics and proteomics provide insights into the metabolic potential of an organism and have been used to understand the genetic and the central carbon metabolism mechanisms for the production of desired end products in various cellulolytic clostridia cultured on different substrates In this study, C. termitidis was cultured on lignocellulose derived simple and complex sugars: cellobiose, xylose, xylan and ?–cellulose as sole carbon sources. 2D HPLC-MS/MS quantitative Proteomic profiles and RNA seq transcriptome profiles (next generation sequencing to identify and quantify RNA in biological samples) were analyzed to identify the genes involved in substrate degradation, cellodextrin transport and end product synthesis related genes Identification of these genes is important in understanding the metabolic networks of C. termitidis and could be valuable engineering targets for improving biomass to biofuel production. Closridium termitidis was cultured on 2g/L each of ?-cellulose, xylan, cellobiose and xylose. Samples were collected from the exponential phase. 2 replicate experiments were conducted under each substrate condition

2015-05-01 | E-GEOD-66125 | biostudies-arrayexpress

Project description:The transcriptional activator XlnR (Xlr1/Xyr1) is a major regulator in fungal xylan and cellulose degradation as well as in the utilization of d-xylose via the pentose catabolic pathway. XlnR homologs are commonly found in filamentous ascomycetes and often assumed to have the same function in different fungi. However, a comparison of the saprobe Aspergillus niger and the plant pathogen Magnaporthe oryzae showed different phenotypes for deletion strains of XlnR. In this study wild type and xlnR/xlr1/xyr1 mutants of five fungi were compared: Fusarium graminearum, M. oryzae, Trichoderma reesei, A. niger and Aspergillus nidulans. Growth profiling on relevant substrates and a detailed analysis of the secretome as well as extracellular enzyme activities demonstrated a common role of this regulator in activating genes encoding the main xylanolytic enzymes. However, large differences were found in the set of genes that is controlled by XlnR in the different species, resulting in the production of different extracellular enzyme spectra by these fungi. This comparison emphasizes the functional diversity of a fine-tuned (hemi-)cellulolytic regulatory system in filamentous fungi, which might be related to the adaptation of fungi to their specific biotopes.

2014-08-01 | PXD001190 | Pride

Aspergillus niger WT: Control vs. xylan induction

Project description:Transcriptional profiling of the A. niger WT (N402) strain treated with xylan (1%, w/v) for 6, 12 and 24 h. The main objective was to identify genes related to cellulases and hemicellulases after treatment with the polysaccharide xylan. The experiment was further validated by enzymatic assays. Three-condition experiment: WT-Xylan for 6, 12 and 24 h at 30oC in batch culture. Firstly, the WT (N402) strain was grown in minimal medium with fructose as carbon source (control), and then transferred to 1% (w/v) xylan as carbon source. 2 biological replicates per time point.

2010-10-21 | E-GEOD-24848 | biostudies-arrayexpress

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