Characterisation of Specific Activities and Hydrolytic Properties of Cell-Wall-Degrading Enzymes Produced by Trichoderma reesei Rut C30 on Different Carbon Sources

2009 ◽  
Vol 161 (1-8) ◽  
pp. 347-364 ◽  
Author(s):  
Bálint Sipos ◽  
Zsuzsa Benkő ◽  
Dóra Dienes ◽  
Kati Réczey ◽  
Liisa Viikari ◽  
...  
Keyword(s):  
Cell Wall ◽  
Trichoderma Reesei ◽  
Carbon Sources ◽  
Cell Wall Degrading Enzymes ◽  
Degrading Enzymes ◽  
Trichoderma Reesei Rut C30 ◽  
Specific Activities ◽  
Rut C30

scholarly journals The regulatory and transcriptional landscape associated with carbon utilization in a filamentous fungus

2020 ◽  
Vol 117 (11) ◽  
pp. 6003-6013 ◽  
Author(s):  
Vincent W. Wu ◽  
Nils Thieme ◽  
Lori B. Huberman ◽  
Axel Dietschmann ◽  
David J. Kowbel ◽  
...  
Keyword(s):  
Cell Wall ◽  
Transcription Factors ◽  
Plant Cell ◽  
Plant Cell Wall ◽  
Plant Biomass ◽  
Carbon Sources ◽  
Cell Wall Degrading Enzymes ◽  
Degrading Enzymes ◽  
Genes Encoding

Filamentous fungi, such asNeurospora crassa, are very efficient in deconstructing plant biomass by the secretion of an arsenal of plant cell wall-degrading enzymes, by remodeling metabolism to accommodate production of secreted enzymes, and by enabling transport and intracellular utilization of plant biomass components. Although a number of enzymes and transcriptional regulators involved in plant biomass utilization have been identified, how filamentous fungi sense and integrate nutritional information encoded in the plant cell wall into a regulatory hierarchy for optimal utilization of complex carbon sources is not understood. Here, we performed transcriptional profiling ofN. crassaon 40 different carbon sources, including plant biomass, to provide data on how fungi sense simple to complex carbohydrates. From these data, we identified regulatory factors inN. crassaand characterized one (PDR-2) associated with pectin utilization and one with pectin/hemicellulose utilization (ARA-1). Using in vitro DNA affinity purification sequencing (DAP-seq), we identified direct targets of transcription factors involved in regulating genes encoding plant cell wall-degrading enzymes. In particular, our data clarified the role of the transcription factor VIB-1 in the regulation of genes encoding plant cell wall-degrading enzymes and nutrient scavenging and revealed a major role of the carbon catabolite repressor CRE-1 in regulating the expression of major facilitator transporter genes. These data contribute to a more complete understanding of cross talk between transcription factors and their target genes, which are involved in regulating nutrient sensing and plant biomass utilization on a global level.

Involvement of G-alpha protein GNA3 in production of cell wall-degrading enzymes by Trichoderma reesei (Hypocrea jecorina) during mycoparasitism against Pythium ultimum

2008 ◽  
Vol 31 (4) ◽  
pp. 531-536 ◽  
Author(s):  
Roberto do Nascimento Silva ◽  
Andrei Stecca Steindorff ◽  
Cirano José Ulhoa ◽  
Carlos Roberto Félix
Keyword(s):  
Cell Wall ◽  
Trichoderma Reesei ◽  
Pythium Ultimum ◽  
Hypocrea Jecorina ◽  
Cell Wall Degrading Enzymes ◽  
Degrading Enzymes

scholarly journals Mannose and mannobiose specific responses of insect associated cellulolytic Streptomyces.

2021 ◽  
Author(s):  
Keisuke Ohashi ◽  
Shogo Hataya ◽  
Akane Nakata ◽  
Kazuki Matsumoto ◽  
Natsumi Kato ◽  
...  
Keyword(s):  
Cell Wall ◽  
Plant Cell ◽  
Plant Cell Wall ◽  
Carbon Sources ◽  
Genomic Analysis ◽  
Transcriptional Regulator ◽  
Sequence Motif ◽  
Cell Wall Degrading Enzymes ◽  
Degrading Enzymes ◽  
Available Carbon

The cellulolytic insect symbiont bacterium, Streptomyces sp. SirexAA-E (SirexAA-E) secretes a suite of Carbohydrate Active enZymes (CAZymes), which are involved in the degradation of various polysaccharides in the plant cell wall, in response to the available carbon sources. Here, we examined a poorly understood response of this bacterium to mannan, one of the major plant cell wall components. SirexAA-E grew well on mannose, carboxymethyl cellulose (CMC), and locust bean gum (LBG) as sole carbon sources in the culture medium. The secreted proteins from each culture supernatant were tested for their polysaccharide-degrading ability, and the composition of secreted CAZymes in each sample was determined by LC-MS/MS. The results indicated that mannose, LBG, and CMC induced the secretion of mannan and cellulose-degrading enzymes. Interestingly, two α-1,2-mannosidases were abundantly secreted during growth on mannose and LBG. By genomic analysis, we found a unique 12 bp palindromic sequence motif at 4 locations in the SirexAA-E genome, two of which were found upstream of the above-mentioned α-1,2-mannosidase genes, along with a newly identified mannose and mannobiose-responsive transcriptional regulator, SsManR. Furthermore, the previously reported cellobiose-responsive repressor, SsCebR, was determined to also use mannobiose as an effector ligand. To test whether mannobiose induces the sets of genes under the control of the two regulators, SirexAA-E was grown on mannobiose, and the secretome composition was analyzed. As hypothesized, the composition of the mannobiose secretome combined sets of CAZymes found in both LBG and CMC secretomes, and so are likely under the regulation of both SsManR and SsCebR. Importance Streptomyces sp. SirexAA-E, a microbial symbiont of biomass harvesting insects, secretes a suite of polysaccharide-degrading enzymes dependent on the available carbon sources. However, the response of this bacterium to mannan has not been documented. In this study, we investigated the response of this bacterium to mannose, mannobiose, and galactomannan (LBG). By combining biochemical, proteomic, and genomic approaches, we discovered a novel mannose and mannobiose responsive transcriptional regulator, SsManR, which selectively regulates three α-1,2-mannosidase-coding genes. We also demonstrated that the previously described cellobiose responsive regulator, SsCebR, could use mannobiose as an effector ligand. Overall, our findings suggest that the Streptomyces sp. SirexAA-E responds to mannose and mannooligosaccharides through two different transcriptional repressors that regulate the secretion of the plant cell wall-degrading enzymes to extract carbon sources in the host environment.

Use of cell wall degrading enzymes to improve the recovery of lipids from Chlorella sorokiniana

2019 ◽  
Vol 377 ◽  
pp. 120325 ◽  
Author(s):  
Antonio Zuorro ◽  
Veronica Malavasi ◽  
Giacomo Cao ◽  
Roberto Lavecchia
Keyword(s):  
Cell Wall ◽  
Chlorella Sorokiniana ◽  
Cell Wall Degrading Enzymes ◽  
Degrading Enzymes
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