cellulase/تسوس سني

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Physico-chemical oxidative cleavage strategy facilitates the degradation of recalcitrant crystalline cellulose by cellulases hydrolysis.

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UNASSIGNED Efficient enzymatic conversion of recalcitrant crystalline cellulose is critical for enabling cost-effective industrial conversion of cellulosic biomass to biofuels and chemicals. Fully understanding enzyme digestion mechanism is paving a new way to design efficient process for biomass

CisPG21 and CisCEL16 are involved in the regulation of the degradation of cell walls during secretory cavity cell programmed cell death in the fruits of Citrus sinensis (L.) Osbeck

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Pectinase and cellulase participate in cell wall degradation during secretory cavity formation in Citrus fruits. However, it remains unknown how secretory cavity formation is regulated by pectinase and cellulase genes in a schizolysigenous model. Our Results showed that PCD was involved in the

Structures of mutants of cellulase Cel48F of Clostridium cellulolyticum in complex with long hemithiocellooligosaccharides give rise to a new view of the substrate pathway during processive action.

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An efficient breakdown of lignocellulosic biomass is a prerequisite for the production of second-generation biofuels. Cellulases are key enzymes in this process. We crystallized complexes between hemithio-cello-deca and dodecaoses and the inactive mutants E44Q and E55Q of the endo-processive

Revealing nature's cellulase diversity: the digestion mechanism of Caldicellulosiruptor bescii CelA.

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Most fungi and bacteria degrade plant cell walls by secreting free, complementary enzymes that hydrolyze cellulose; however, some bacteria use large enzymatic assemblies called cellulosomes, which recruit complementary enzymes to protein scaffolds. The thermophilic bacterium Caldicellulosiruptor

Molecular Dynamics and Metadynamics Simulations of the Cellulase Cel48F.

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Molecular dynamics (MD) and metadynamics techniques were used to study the cellulase Cel48F-sugar. Cellulase is enzyme that breaks cellulose fibers into small sugar units and is potentially useful in second generation alcohol production. In MD simulations, the overall structure of equilibrated

Improvement in activity of cellulase Cel12A of Thermotoga neapolitana by the error prone PCR.

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Using multi-steperror prone PCR (ep-PCR) of the gene encoding endoglucanase Cel12A (27 kDa) from Thermotoga neapolitana, mutants were obtained with many fold increase in the enzyme activity. The best mutant (C6, N47S/E57 K/ V88A/S157 P/K165 H) obtained after four rounds of ep-PCR showed 2.7-, 5- and

Synthesis of prenylated flavonols and their potents as estrogen receptor modulator.

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Prenylated flavonols are known as phytoestrogen and have good bioactivties. However, their abundances in nature are pretty low. It is required to find an efficient synthesis technique. Icariin is a prenylated flavonol glycoside with low cost. It can be used to synthesize different prenylated

Effect of the molecular structure of lignin-based polyoxyethylene ether on enzymatic hydrolysis efficiency and kinetics of lignocelluloses.

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Effect of the molecular structure of lignin-based polyoxyethylene ether (EHL-PEG) on enzymatic hydrolysis of Avicel and corn stover was investigated. With the increase of PEG contents and molecular weight of EHL-PEG, glucose yield of corn stover increased. EHL-PEG enhanced enzymatic hydrolysis of

Homologous expression of the Caldicellulosiruptor bescii CelA reveals that the extracellular protein is glycosylated.

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Members of the bacterial genus Caldicellulosiruptor are the most thermophilic cellulolytic microbes described with ability to digest lignocellulosic biomass without conventional pretreatment. The cellulolytic ability of different species varies dramatically and correlates with the presence of the

Structure of an endoglucanase from termite, Nasutitermes takasagoensis.

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Contrary to conventional wisdom, it has been shown recently that termites do not necessarily depend on symbiotic bacteria to process cellulose. They secrete their own cellulases, mainly endo-beta-1,4-glucanase and beta-1,4-glucosidase. Here, the first structure of an endogenous endoglucanase from

The ACEII recombinant Trichoderma reesei QM9414 strains with enhanced xylanase production and its applications in production of xylitol from tree barks.

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BACKGROUND ACEII transcription factor plays a significant role in regulating the expression of cellulase and hemicellulase encoding genes. Apart from ACEII, transcription factors such as XYR1, CRE1, HAP2/3/5 complex and ACEI function in a coordinated pattern for regulating the gene expression of

Growth of toxic-shock-syndrome strain of Staphylococcus aureus after enzymic degradation of 'Rely' tampon component.

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beta-glucosidase, cellulase, alpha-mannosidase, beta-galactosidase, and N-acetyl-beta-glucosaminidase were tested for their ability to hydrolyse the carboxymethylcellulose contained in 'Rely' tampons (R-CMC). The end-products of the hydrolysis were determined by chromatography. Only beta-glucosidase

Studies on the biosynthesis and metabolism of the phytoalexin lubimin and related compounds in Datura stramonium L.

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Arachidonic acid, cellulase, CuSO4, a sonicate of Phytophthora infestans mycelium and a spore suspension of Penicillium chrysogenum all elicited the formation of the sesquiterpenoid phytoalexins lubimin, 3-hydroxylubimin and rishitin in fruit cavities of Datura stramonium. 3-Hydroxylubimin was the

Directed Evolution of Clostridium thermocellum β-Glucosidase A Towards Enhanced Thermostability.

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β-Glucosidases are key enzymes in the process of cellulose utilization. It is the last enzyme in the cellulose hydrolysis chain, which converts cellobiose to glucose. Since cellobiose is known to have a feedback inhibitory effect on a variety of cellulases, β-glucosidase can prevent this inhibition

Truncation of the processive Cel5A of Thermotoga maritima results in soluble expression and several fold increase in activity.

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Cel5A of Thermotoga maritima, a 37 kDa cellulase of the family GH5, was expressed in partially soluble state in E. coli. However, the truncated version tCel5A1, produced by removing ten residues from the C-terminal of Cel5A, was expressed in a completely soluble form. tCel5A1 showed 7.3- fold

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