Hemicellulases
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Endophytic Actinomycetes as Potential Producers of Hemicellulases and Related Enzymes for Plant Biomass Degradation
Abstract Tailor made enzymatic preparation must be design to hydrolyze efficiently plant biomass, once that each plant biomass possesses a distinct cell wall composition. Most of actinomycetes used for plant cell wall degradation are focused on the cellulases and xylanases production. However, a wide range of enzymes must be produced for an efficient degrada
Braz. arch. biol. technol.. Publicado em: 29/08/2019
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2. Efficient production of lignocellulolytic enzymes xylanase, β-xylosidase, ferulic acid esterase and β-glucosidase by the mutant strain Aspergillus awamori 2B.361 U2/1
The production of xylanase, β-xylosidase, ferulic acid esterase and β-glucosidase by Aspergillus awamori 2B.361 U2/1, a hyper producer of glucoamylase and pectinase, was evaluated using selected conditions regarding nitrogen nutrition. Submerged cultivations were carried out at 30 ºC and 200 rpm in growth media containing 30 g wheat bran/L as main carbon
Braz. J. Microbiol.. Publicado em: 2013
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3. Clonagem e estudos de expressão de enzimas do fungo filamentoso Trichoderma harzianum IOC-3844 envolvidas na degradação de biomassa
The plant biomass is a large-scale available resource and one of its more important applications is the second-generation ethanol production. However, the enzyme cost is one of the biggest barriers for economically viable ethanol from biomass. Therefore, it is important to identify fungal strains that can produce high concentrations of plant biomass-degradin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/07/2012
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4. Celulases e hemicelulases de espécies endofíticas de Acremonium / Cellulases and hemicellulases from endophytic Acremonium species
Duas espécies do fungo Acremonium (Acremonium zeae EA0802 e Acremonium sp. EA 0810) foram estudadas quanto ao potencial de produção de celulases com atividade de hidrólise de papel de filtro (FPases), endoglicanases, β- glicosidases, xilanases, α-galactosidases, α- arabinofuranosidases e β-xilosidases. Os fungos foram cultivados em cu
Publicado em: 2009
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5. Phenolic Acids in Wheat Coleoptile Cell Walls 1
The phenolic constituent of nonvascular cell walls of wheat (Triticum aestivum L.) coleoptiles, which yields vanillin upon nitrobenzene oxidation, is not lignin as I previously claimed. It seems to be mainly ferulic acid bonded to carbohydrate, probably by an ester linkage. The acid is associated with a fraction of the wall rich in arabinose and xylose, alth
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6. Regulation of Expression of Cellulosomal Cellulase and Hemicellulase Genes in Clostridium cellulovorans
The regulation of expression of the genes encoding the cellulases and hemicellulases of Clostridium cellulovorans was studied at the mRNA level with cells grown under various culture conditions. A basic pattern of gene expression and of relative expression levels was obtained from cells grown in media containing poly-, di- or monomeric sugars. The cellulase
American Society for Microbiology.
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7. Synergistic Effects of Cellulosomal Xylanase and Cellulases from Clostridium cellulovorans on Plant Cell Wall Degradation
Plant cell walls are comprised of cellulose and hemicellulose and other polymers that are intertwined, and this complex structure presents a barrier to degradation by pure cellulases or hemicellulases. In this study, we determined the synergistic effects on corn cell wall degradation by the action of cellulosomal xylanase XynA and cellulosomal cellulases fro
American Society for Microbiology.
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8. The Membrane-Bound α-Glucuronidase from Pseudomonas cellulosa Hydrolyzes 4-O-Methyl-d-Glucuronoxylooligosaccharides but Not 4-O-Methyl-d-Glucuronoxylan
The microbial degradation of xylan is a key biological process. Hardwood 4-O-methyl-d-glucuronoxylans are extensively decorated with 4-O-methyl-d-glucuronic acid, which is cleaved from the polysaccharides by α-glucuronidases. In this report we describe the primary structures of the α-glucuronidase from Cellvibrio mixtus (C. mixtus GlcA67A) and the α-glucu
American Society for Microbiology.
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9. EglC, a New Endoglucanase from Aspergillus niger with Major Activity towards Xyloglucan
A novel gene, eglC, encoding an endoglucanase, was cloned from Aspergillus niger. Transcription of eglC is regulated by XlnR, a transcriptional activator that controls the degradation of polysaccharides in plant cell walls. EglC is an 858-amino-acid protein and contains a conserved C-terminal cellulose-binding domain. EglC can be classified in glycoside hydr
American Society for Microbiology.
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10. Recognition specificity of the duplicated segments present in Clostridium thermocellum endoglucanase CelD and in the cellulosome-integrating protein CipA.
The binding specificity of the duplicated segments borne by Clostridium thermocellum endoglucanase CelD and by the cellulosome-integrating protein CipA was investigated. The fusion protein CelC-DSCelD, in which the duplicated segment of CelD was fused to the COOH terminus of endoglucanase CelC, bound with an affinity of 4.7 x 10(7) M-1 to the fusion protein
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11. Extracellular Enzymes Produced by the Cultivated Mushroom Lentinus edodes during Degradation of a Lignocellulosic Medium
Although the commercially important mushroom Lentinus (= Lentinula) edodes (Berk.) Sing. can be rapidly cultivated on supplemented wood particles, fruiting is not reliable. This study addressed the problem by developing more information about growth and development on a practical oakwood-oatmeal medium. The study determined (i) the components degraded during
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12. Transcriptional Regulation of Genes Encoding Arabinan-Degrading Enzymes in Bacillus subtilis
Bacillus subtilis produces hemicellulases capable of releasing arabinosyl oligomers and arabinose from plant cell walls. In this work, we characterize the transcriptional regulation of three genes encoding arabinan-degrading enzymes that are clustered with genes encoding enzymes that further catabolize arabinose. The abfA gene comprised in the metabolic oper
American Society for Microbiology.