Tomashek, CA
John Tomashek, Ottawa CA
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20090061484 | ENZYMATIC HYDROLYSIS OF LIGNOCELLULOSIC FEEDSTOCKS USING ACCESSORY ENZYMES - Provided is an enzyme mixture for hydrolyzing a pretreated lignocellulosic feedstock to soluble sugars. The enzyme mixture comprises EG4 at a fractional concentration (f | 03-05-2009 |
20100068768 | ENZYME COMPOSITIONS AND METHODS FOR THE IMPROVED ENZYMATIC HYDROLYSIS OF CELLULOSE - A process for the enzymatic hydrolysis of cellulose to produce a hydrolysis product comprising glucose from a pretreated lignocellulosic feedstock and enzymes for use in the process are provided. The process comprises partially hydrolyzing an aqueous slurry of a pretreated lignocellulosic feedstock with cellulase enzymes, one or more than one β-glucosidase enzyme and a binding agent for binding the β-glucosidase enzyme to fiber solids present in the aqueous slurry. The unhydrolyzed fiber solids are then separated from the hydrolyzed slurry. The separated fiber solids thus obtained are then re-suspended in an aqueous solution to produce a re-suspended slurry. The hydrolysis is then continued to produce the hydrolysis product comprising glucose. | 03-18-2010 |
John Tomashek, Ontario CA
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20090209009 | ENZYME COMPOSITIONS FOR THE IMPROVED ENZYMATIC HYDROLYSIS OF CELLULOSE AND METHODS OF USING SAME - A process for the enzymatic hydrolysis of cellulose to produce a hydrolysis product comprising glucose from a pretreated lignocellulosic feedstock and enzymes for use in the process are provided. The process comprises hydrolyzing an aqueous slurry of a pretreated lignocellulosic feedstock with cellulase enzymes, one or more than one β-glucosidase enzyme and a binding agent for binding the β-glucosidase enzyme to fiber solids present in the aqueous slurry. During the hydrolysis, both the cellulase enzyme and β-glucosidase enzyme bind to the fiber solids. The hydrolysis is performed in a solids-retaining hydrolysis reactor so that unhydrolyzed fiber solids and bound enzyme are retained in the reactor longer than the aqueous phase of the slurry. | 08-20-2009 |
20100016570 | MODIFIED FAMILY 6 GLYCOSIDASES WITH ALTERED SUBSTRATE SPECIFICITY - A modified Family 6 glycosidase enzyme comprising amino acid substitutions at one or more positions selected from the group 182, 367, 399, 400 and 427 is provided (the position determined form alignment of a parental Family 6 glycosidase with SEQ ID NO: 1). Genetic constructs and genetically modified microbes comprising nucleic sequences encoding the modified Family 6 glycosidase are also provided. Family 6 glycosidase of the invention display decreased hydrolysis activity of beta 1-4 linked polysaccharides and increased hydrolysis activity of beta 1-3, 1-4 linked polysaccharides compared with a parental Family 6 glycosidase. Such glycosidases find use in a variety of applications in industry, e.g., in hydrolysis of beta 1-3, 1-4 linked polysaccharides during the processing of cereal grains or the production of alcohol, animal feed or food products. | 01-21-2010 |
John J. Tomashek, Ottawa CA
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20090186381 | CELLULASE VARIANTS WITH REDUCED INHIBITION BY GLUCOSE - A Family 6 cellulase variant enzyme comprising one or more than one amino acid substitution selected from a basic, polar or non-polar amino acid at position 103, a valine or isoleucine at position 136, a tyrosine at position 186, a glutamic acid or glutamine at position 365 and a glutamine at position 410 is provided (said position determined form alignment of the parental Family 6 with SEQ ID NO: 1). Genetic constructs and genetically modified microbes comprising DNA sequences encoding the Family 6 cellulase variant are also provided. Family 6 cellulases of the invention display reduced inhibition by glucose relative to the parent Family 6 cellulases. Such cellulases find use in a variety of applications in industry, e.g., in the hydrolysis of pretreated lignocellulosic feedstock, that require cellulose activity in the presence glucose concentrations that would otherwise inhibit the activity of the parental enzyme. | 07-23-2009 |
20100041100 | FAMILY 6 CELLULASE WITH DECREASED INACTIVATION BY LIGNIN - A modified | 02-18-2010 |
20100093040 | MODIFIED BETA-GLUCOSIDASES WITH IMPROVED STABILITY - Provided are modified beta-glucosidase enzymes, derived from the | 04-15-2010 |
20100304438 | NOVEL BETA-GLUCOSIDASE ENZYMES - Provided are modified beta-glucosidase enzymes, derived from the | 12-02-2010 |
20120295308 | CARBOHYDATE BINDING MODULES WITH REDUCED BINDING TO LIGNIN - Provided is a modified Family 1 carbohydrate binding module (CBM) comprising amino acid substitutions at one or more of positions 10, 11, 12, 14, 17, 21, 24, 29, 31, 33, and 37, said position determined from alignment of a Family 1 CBM amino acid sequence with SEQ ID NO: 30, and exhibiting from about 50% to about 99.9% amino acid sequence identity to SEQ ID NO: 30. Also provided are modified glycosidase enzymes comprising the modified Family 1 CBM, genetic constructs and genetically modified microbes for expressing the modified Family 1 CBM or modified glycosidase enzyme. The modified Family 1 CBM confers reduced lignin binding and/or increased hydrolysing activity in the presence of lignin to the modified glycosidase enzyme, which may be used in a process for hydrolysing cellulose or hemicellulose in the presence of lignin. | 11-22-2012 |
20130337542 | Cellulase Enzyme Mixtures For Depilling and Uses Thereof - The present invention relates to a depilling composition comprising an enzyme mixture that comprises a Family 45 cellulase enzyme component and one or more additional cellulase enzyme components selected from a Family 5 cellulase, a Family 6 cellulase or a combination thereof. The enzyme mixture may be characterized in that the Family 45 and the Family 5 cellulase enzyme components or the Family 45 and the Family 6 cellulase enzyme components are present at a weight ratio that exhibits synergy in an assay that measures specific depilling activity. The enzyme mixture may be secreted by a genetically modified microbe overexpressing theforegoing cellulase enzyme components. Also provided is a process for depilling that comprises a step of contacting cellulose-containing goods with the depilling composition. | 12-19-2013 |
20140295504 | FUNGAL CELLS AND FERMENTATION PROCESSES - The present invention provides an isolated fungal cell that is capable of producing one or more biomass-degrading enzymes and that exhibits increased or decreased expression or copy number of a polynucleotide encoding a PtaB-like protein. Also provided is a fermentation processes for producing one or more biomass-degrading enzymes comprising a fungal cells exhibiting increased or decreased expression or copy number of a polynucleotide encoding a PtaB-like protein. The biomass-degrading enzymes produced by the isolate fungal cell and fermentation processes of the present invention may be used in a process to produce soluble sugars from biomass. | 10-02-2014 |
20140356914 | ENDOGLUCANASE 1B - The present invention provides endoglucanase 1b (EG1b) suitable for use in saccharification reactions. | 12-04-2014 |
John J. Tomashek, Ontario CA
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20100221778 | NOVEL LIGNIN-RESISTANT CELLULASE ENZYMES - Provided are modified cellulase enzymes exhibiting increase cellulose-hydrolyzing activity in the presence of lignin and/or reduced binding to lignin comprising modified linker peptides comprising one or more amino acid substitutions, insertions, or deletions that result in (a) a decrease in the calculated isoelectric point of the linker peptide and/or (b) an increase in the ratio of threonine:serine in the linker peptide relative to a parental linker peptide from which said modified linker peptide is derived. Also provided are genetic constructs comprising nucleic acidsequences encoding for modified cellulase enzymes, methods for the production of the modified cellulase enzymes from host strains and a process for hydrolysing cellulose with the modified cellulases in the presence of lignin. | 09-02-2010 |