59 results about "Cellulosome" patented technology

The present invention is directed to a yeast strain, or strains, secreting a full suite, or any subset of that, full suite, of enzymes to hydrolyze com starch, corn fiber, lignocellulose, (including enzymes that hydrolyze linkages in cellulose, hemicelhiiose, and between lignin and carbohydrates) and to utilize pentose sugars (xylose and arabinose). The invention is also directed to the set of proteins that are well expressed in yeast for each category of enzymatic activity. The resulting strain, or strains can be used to hydrolyze starch and cellulose simultaneously. The resulting strain, or strains can be also metabolically engineered to produce less glycerol and uptake acetate. The resulting strain, or strains can also be used to produce ethanol from granular starch without liquefaction.; The resulting strain, or strains, can be further used to reduce the amount of external enzyme needed to hydrolyze a biomass feedstock during an Simultaneous Saccharification and Fermentation (SSF) process, or to increase the yield of ethanol during SSF at current saccharolytic enzyme loadings. In addition, multiple enzymes of the present invention can be co-expressed in cells of the invention to provide synergistic digestive action on biomass feedstock. In some aspects, host cells expressing different heterologous saccharolytic enzymes can also be co-cultured togetherand used to produce ethanol from biomass feedstock.

The invention discloses a method for saccharifying a cellulose raw material. A cellulosome secreted by high-temperature thermoanaerobion can effectively reduce degrade crystalline cellulose with a complex structure. By adding low concentration acetate into a culture medium and enzyme reaction buffer solution and filling low concentration hydrogen in a fermentor thereof, the method greatly improves the enzyme reaction speed and sugar accumulation. The method can make the cellulose material which is not subjected to physical or chemical pretreatment directly fermented or subjected to enzyme treatment, and efficiently hydrolyze the cellulose material into reducing sugar.

Thermophilic gram-positive anaerobic host cells, for example Thermoanaerobacterium saccharolyticum (“T sacch”), express heterologous biomass degrading enzymes, such as cellulases, and are able to produce useful fermentation products from cellulose. Useful fermentation products include, for example, ethanol, acetic acid, lactic acid or CO2. In order to provide maximum expression and activity levels, biomass degrading enzymes can be expressed from codon-optimized nucleotide sequences, can be expressed under the control of a high-efficiency promoter, and/or can be fused to a signal peptide. In addition, the host cell, for example, a T sacch host cell, can be genetically altered to further improve ethanol production, for example by disrupting the production of organic products other than ethanol.

The present invention is directed to the construction of prototrophic, cellulo lytic strains of Saccharomyces cerevisiae with tethered and secreted cellulases and selection-based improvement of growth on cellulose by these strains. In some embodiments, host cells of the invention are able to produce ethanol using crystalline cellulose as a sole carbon source.

The present invention describes the expression cassette for transforming eukaryotic cell which comprises the peptide encoding non-natural sequence of nucleotides with xylose isomerase feature (SEQ ID NO: 1), optionally also comprising other genes of pentose phosphate route. Additionally, it is described the microorganism filed under the number DSM28739, which, in addition to the above-mentioned modifications, also present genetic modifications from adaptive evolution. The described microorganism shows efficient consumption of xylose and conversion of ethanol when compared to its correspondent without said genetic modifications and mutations from evolution. It is also described the process for producing biofuels e biochemicals, preferably ethanol, mainly from the lignocellulosic portion of the vegetal biomass. Biofuels, preferably ethanol, and biochemicals produced by the process of the invention are also described.

The invention belongs to the technical field of biology, and in particular relates to a cellulase preparation for catalyzing lignocellulose saccharification, and application of the cellulase preparation. The cellulase preparation provided by the invention contains a cellulosome complex and beta-1, 4-glucosidase at the same time, wherein the beta-1, 4-glucosidase is compounded in the cellulosome complex in a way of interaction of covalent or non-covalent proteins or fusion expression with the cellulosome complex. The cellulase preparation not only can realize high-efficiency hydrolysis of a lignocellulose substrate and has high fermentable sugar yield and saccharification rate, but also has the advantages of being low in production cost, and the like.

The present invention provides a multi-component enzyme system that hydrolyzes hemicellulose oligomers from hardwood which can be expressed, for example, in yeast such as Saccharomyces cerevisiae. In some embodiments, this invention provides for the engineering of a series of biocatalysts combining the expression and secretion of components of this enzymatic system with robust, rapid xylose utilization, and ethanol fermentation under industrially relevant process conditions for consolidated bioprocessing. In some embodiments, the invention utilizes co-cultures of strains that can achieve significantly improved performance due to the incorporation of additional enzymes in the fermentation system.

The present invention relates to the engineering and expression of heterologous cellulosomes in microorganisms in order to facilitate the conversion of biomass to useful products. In some embodiments, the invention relates to the expression of scaffoldin proteins which form the nucleus of a cellulosome. Cellulases or other biomass-degrading enzymes can be non-covalently linked to the scaffoldin protein by virtue of a dockerin domain-cohesin domain interaction.

The invention belongs to the field of microbial fermentation engineering, and specifically relates to a high-density culture method of clostridium thermocellum. The method is characterized in that a GS-2 culture medium is used as an initial culture medium; the fermentation medium is optimized through a multivariate statistical method; and cell concentration of clostridium thermocellum is rapidly and efficiently raised. The invention has the following advantage: the invention provides a fermentation medium for rapid acquisition of large cell concentration of clostridium thermocellum, thus laying the groundwork for subsequent production of cellulosome which has high conversion efficiency of cellulose to bioethanol. Bacterial density of clostridium thermocellum is raised by 6-9 times in comparison with that of the initial culture medium. OD600 under the bottling condition reaches 8.85, and OD600 in a fermentation cylinder reaches 12.7.

The invention belongs to the technical field of resin matrix composite structure molding, and relates to a preparation method of a variable-thickness resin matrix composite structure. The variable-thickness resin matrix composite structure is prepared by adopting the following steps: forming a variable-thickness perform by means of an identical ply material thickness lamination structure, and thencuring the variable-thickness perform. The variable-thickness perform eliminates a possibility of difference between pressure fields of resin flowing or difference between cellulosome distributions in the formation of the variable-thickness perform by means of the formation of the identical ply material thickness lamination structure, a high thickness precision variable-thickness perform is obtained, and when the variable-thickness perform is hot-pressed and cured again, the resin system is in a B-stage high-viscosity state, the thickness and the precision are basically set, and high thickness precision features can be maintained, so that the high thickness precision variable thickness composite structure is finally obtained.

The present invention relates to a polynucleotide encoding a recombinant scaffolding polypeptide comprising at least a signal peptide, a Cellulose Binding Domain, two cohesin domains and an S-layer Homology domain, wherein said isolated polynucleotide preferably comprises all or an active part of the nucleotide sequence as set forth in SEQ ID NO:2. The present invention further relates to vectors comprising such polynucleotides, recombinant lactic acid bacteria, and method for degrading a cellulosic biomass using such recombinant lactic acid bacteria.

Provided herein are novel proteins and protein domains from newly discovered anaerobic fungal species. The anaerobic fungal species have unique enzymatic capabilities, including the ability to digest diverse lignocellulosic biomass feedstocks and to synthesize secondary metabolites. The scope of the invention encompasses novel engineered proteins comprising glycoside hydrolase enzymes, dockerin domains, carbohydrate binding domains, and polyketide synthase enzymes. The invention further encompasses artificial cellulosomes comprising novel proteins and domains of the invention. The scope of the invention further includes novel nucleic acid sequences coding for the engineered proteins of the invention, and methods of using such engineered organisms to degrade lignocellulosic biomass and to create polyketides.

A disclosed manufacturing method for negative-ion cellulosome comprises: step 1, selecting a base material, wherein the base material is a chemical fiber or cotton fiber material; step 2, preparing a nanometer tourmalinite slurry, specifically dissolving tourmalinite in water, wherein the weight ratio of tourmalinite to water is 3:5; step 3, injecting the prepared nanometer tourmalinite slurry into the base material by spraying; and step 4, drying the base material subjected to spraying injection to obtain the negative-ion cellulosome. In the step 3, the nanometer tourmalinite slurry is uniformly injected into the base material through spraying. In the step 4, air drying is employed and the drying temperature is 30-50 DEG C. The negative-ion cellulosome comprises a cellulosome body prepared from the chemical fiber or cotton fiber material, and the cellulosome body is inside provided with the nanometer tourmalinite. The beneficial effects comprise that the manufacturing method is practical, the production cost is low, the usage is convenient, and the manufactured negative-ion cellulosome is capable of effectively improving air environment around people, such as air environment in a car.

The present invention relates to modified family-8 cellulases that exhibit enhanced thermostability compared to the corresponding wild-type enzyme, polynucleotides encoding the modified cellulases, compositions comprising same and uses thereof. The variant family-8 cellulases are advantageous for the bioconversion process of cellulosic substrates.

The invention discloses bovine induced expansion pluripotent adult stem cells, a line establishment method and a culture solution, and the bovine induced expansion pluripotent adult stem cells are obtained by transgenosis and induced culture from bovine fibroblast cells and can be stably subcultured in vitro. The stem cell has totipotency, stability and safety, can be differentiated in an in-vivo and out-of-embryo tissue and an out-of-embryo tissue, and can be applied to various life science and medical fields such as breeding and breeding, gene editing, animal cloning, medical models, drug development carriers, induced production of bovine reproductive gametes and the like.

The invention discloses a cellulosome with improved catalytic activity and an assembly method and application thereof, and belongs to the technical field of biology. According to the assembly method,xylanase AExynM-Doc1 containing a docking domain and glucanase EG1-Doc2 containing a docking domain are expressed heterologously by using escherichia coli; fibronectin Coh1-Coh2 are surface-displayedby using saccharomyces cerevisiae, to obtain a recombinant yeast EBY100/Coh1-Coh2; and the recombinant proteins AExynM-Doc1 and EG1-Doc2 are mixed with the recombinant yeast EBY100/Coh1-Coh2, and arerespectively bound with the Coh1 and the Coh2 to finish in-vitro assembly of the cellulosome. According to the invention, the xylanase and glucanase with high catalytic activity are combined in scaffold protein of the cellosome, so that the synergistic catalytic action between the two enzymes is greatly improved, and lignocellulose can be more effectively degraded.

A lignocellulolytic multi-enzyme complex in the form of a cellulosome, which includes a lignin-modifying enzyme and a carbohydrate-active enzyme, is provided herewith, as well as bifunctional chimeric enzymes having lignin and cellulose/hemicellulose degrading capacity. Also provided are methods of degrading lignocellulolytic biomass, and compositions and systems for effecting the same.

The invention provides a pichia pastoris surface co-display system based on cellulosome as well as a construction method and application of the pichia pastoris surface co-display system and belongs tothe technical fields of molecular biology, food and gene engineering. The system comprises anchoring protein and polyprotein display chassis protein, wherein the anchoring protein is saccharomyces cerevisiae cell wall protein Sed1p; and the polyprotein display chassis protein is artificial mini scaffold protein MixA2 of clostridium cellulosome. The pichia pastoris surface co-display system basedon cellulosome can realize polyprotein co-display on cell surfaces; heterologous protein for fusion expression of dockerin is prepared from recombinant bacteria, purification is not needed, multiple proteins can be displayed on cell surfaces by direct specific binding of dockerin on recombinant protein and cohesion on MixA2, and the preparation cost of recombinant protein can be saved effectively.

The invention provides a zymogram analysis method for semi-cellulosome analogue and belongs to the technical field of industrial biology. The method disclosed by the invention is characterized in thatthe whole analysis process is composed of three parts: electrophoresis, zymogram analysis and proteinogram analysis. A continuous gradient non-modified gel without concentrated gel is adopted for electrophoresis; an off-on probe substrate is adopted for zymogram analysis; coomassie blue staining or silver staining is adopted for proteinogram analysis. According to the method, once electrophoresisis performed while zymogram and proteinogram information of a block of gel are collected; if multienzyme complex is generated in supernatant of microorganism fermentation liquor can be quickly and effectively judged; the zymogram analysis method is developed for screening microbial strains capable of generating cellulosome compounds and can be applied to the fields of industrial bioconversion, biological energy source, medical intermediate preparation, and the like.