Cellobiohydrolase I
Mostrando 13-24 de 31 artigos, teses e dissertações.
-
13. Induction of a Cryphonectria parasitica cellobiohydrolase I gene is suppressed by hypovirus infection and regulated by a GTP-binding-protein-linked signaling pathway involved in fungal pathogenesis.
Extracellular cellulase activity is readily induced when the chestnut blight fungus Cryphonectria parasitica is grown on cellulose substrate as the sole carbon source. However, an isogenic C. parasitica strain rendered hypovirulent due to hypovirus infection failed to secrete detectable cellulase activity when grown under parallel conditions. Efforts to iden
-
14. Characterization of a Neocallimastix patriciarum cellulase cDNA (celA) homologous to Trichoderma reesei cellobiohydrolase II.
The nucleotide sequence of a cellulase cDNA (celA) from the rumen fungus Neocallimastix patriciarum and the primary structure of the protein which it encodes were characterized. The celA cDNA was 1.95 kb long and had an open reading frame of 1,284 bp, which encoded a polypeptide having 428 amino acid residues. A sequence alignment showed that cellulase A (CE
-
15. Cloning, expression in Escherichia coli, and characterization of cellulolytic enzymes of Azoarcus sp., a root-invading diazotroph.
We screened members of a new genus of grass-associated diazotrophs (Azoarcus spp.) for the presence of cellulolytic enzymes. Out of five Azoarcus strains representing different species, only in the endorhizosphere isolate BH72, which is also capable of invading grass roots, was significant endoglucanase activity, in addition to beta-glucosidase and cellobioh
-
16. Colloidal Gold Cytochemistry of Endo-1,4-β-Glucanase, 1,4-β-D-Glucan Cellobiohydrolase, and Endo-1,4-β-Xylanase: Ultrastructure of Sound and Decayed Birch Wood †
Colloidal gold coupled to endo-1,4-β-glucanase II (EG II) and 1,4-β-D-glucan cellobiohydrolase I (CBH I), isolated from Trichoderma reesei (QM9414), and endo-1,4-β-xylanase from Aureobasium pullulans (NRRLY-2311-1) was used successfully to determine the ultrastructural localization of cellulose and xylan in sound birch wood. In addition, these enzyme-gold
-
17. High-Yield Production of a Bacterial Xylanase in the Filamentous Fungus Trichoderma reesei Requires a Carrier Polypeptide with an Intact Domain Structure
A bacterial xylanase gene, Nonomuraea flexuosa xyn11A, was expressed in the filamentous fungus Trichoderma reesei from the strong cellobiohydrolase 1 promoter as fusions to a variety of carrier polypeptides. By using single-copy isogenic transformants, it was shown that production of this xylanase was clearly increased (up to 820 mg/liter) when it was produc
American Society for Microbiology.
-
18. Comparison of a fungal (family I) and bacterial (family II) cellulose-binding domain.
A family II cellulose-binding domain (CBD) of an exoglucanase/xylanase (Cex) from the bacterium Cellulomonas fimi was replaced with the family I CBD of cellobiohydrolase I (CbhI) from the fungus Trichoderma reesei. Expression of the hybrid gene in Escherichia coli yielded up to 50 mg of the hybrid protein, CexCBDCbhI, per liter of culture supernatant. The hy
-
19. [beta]-Glucan Synthesis in the Cotton Fiber (IV. In Vitro Assembly of the Cellulose I Allomorph).
In vitro assembly of cellulose from plasma membrane extracts of the cotton (Gossypium hirsutum) fiber was enriched by a combination of 3-(N-morpholino)propanesulfonic acid extraction buffer and two independent digitonin solubilization steps consisting of 0.05% digitonin (SE1) followed by 1% digitonin (SE2). Glucan synthase activity assays revealed that, alth
-
20. Double-antibody sandwich enzyme-linked immunosorbent assay for quantitation of endoglucanase I of Trichoderma reesei.
A sensitive and specific enzyme-liked immunosorbent assay for endoglucanase I (EG-I) has been developed. The monoclonal antibody a-EG-I 2, directed against an epitope on the core part of the enzyme, was used to capture the antigen in microtiter plate wells. A second, polyclonal antibody against the enzyme was then used to detect and quantitate the bound anti
-
21. A Novel Saponin Hydrolase from Neocosmospora vasinfecta var. vasinfecta
We isolated a soybean saponin hydrolase from Neocosmospora vasinfecta var. vasinfecta PF1225, a filamentous fungus that can degrade soybean saponin and generate soyasapogenol B. This enzyme was found to be a monomer with a molecular mass of about 77 kDa and a glycoprotein. Nucleotide sequence analysis of the corresponding gene (sdn1) indicated that this enzy
American Society for Microbiology.
-
22. Overexpression of the Saccharomyces cerevisiae Mannosylphosphodolichol Synthase-Encoding Gene in Trichoderma reesei Results in an Increased Level of Protein Secretion and Abnormal Cell Ultrastructure
Production of extracellular proteins plays an important role in the physiology of Trichoderma reesei and has potential industrial application. To improve the efficiency of protein secretion, we overexpressed in T. reesei the DPM1 gene of Saccharomyces cerevisiae, encoding mannosylphosphodolichol (MPD) synthase, under homologous, constitutively acting express
American Society for Microbiology.
-
23. Carbon Source Control of Cellobiohydrolase I and II Formation by Trichoderma reesei
Regulation of the formation and secretion of two cellulase components from Trichoderma reesei QM 9414, cellobiohydrolases I and II (CBH I and CBH II, respectively), by the carbon source was investigated. With monoclonal antibodies against CBH I and CBH II it was found that during cultivation on carbon sources which enable fast growth (glucose, glycerol, and
-
24. Enzymatic hydrolysis of cellulose: Visual characterization of the process
Cellulose from the Gram-negative bacterium Acetobacter xylinum has been used as a model substrate for visualizing the action of cellulase enzymes from the fungus Trichoderma reesei. High-resolution electron microscopy reveals that A. xylinum normally produces a ribbon of cellulose that is a composite of bundles of crystalline microfibrils. Visual patterns of