Abstract: The present invention provides for a mechanism to reduce glycerol production and increase nitrogen utilization and ethanol production of recombinant microorganisms. One aspect of this invention relates to strains of S. cerevisiae with reduced glycerol productivity that get a kinetic benefit from higher nitrogen concentration without sacrificing ethanol yield. A second aspect of the invention relates to metabolic modifications resulting in altered transport and/or intracellular metabolism of nitrogen sources present in corn mash.

Abstract: The present disclosure concerns recombinant yeast host cells expressing heterologous enzymes for hydrolyzing flavor compounds glycosidically bound to a sugar molecule. The recombinant yeast host cells can be used in a subsequent production process to make alcoholic beverage products such as wines and beers.

Abstract: The present disclosure concerns recombinant yeast host cells having a first genetic modification to express a heterologous polypeptide or to over-express a native polypeptide. The recombinant yeast host cells also have a second genetic modification to at least partially mitigate the reduction in growth rate resulting from the expression of the heterologous polypeptide or the over-expression of the native polypeptide. The second genetic modification can be, for example, to favor the secretion of the heterologous or native polypeptide.

Abstract: The present disclosure concerns yeast host cell especially suited for the expression of heterologous proteins, such as heterologous enzymes. The yeast host cell of the present disclosure exhibits an alteration in the cAMP signaling pathway which allows achieving increased heterologous protein yield and associated biological activity. The yeast host cell can also exhibit polyploidy.

Abstract: The present invention provides for novel metabolic pathways to convert biomass and other carbohydrate sources to malonyl-CoA derived products, such as hydrocarbons and other bioproducts, under anaerobic conditions and with the net production of ATP. More specifically, the invention provides for a recombinant microorganism comprising one or more native and/or heterologous enzymes that function in one or more engineered metabolic pathways to achieve conversion of a carbohydrate source to, e.g., long-chain hydrocarbons and hydrocarbon derivatives, wherein the one or more native and/or heterologous enzymes is activated, upregulated, downregulated, or deleted. The invention also provides for processes to convert biomass to malonyl-CoA derived products which comprise contacting a carbohydrate source with a recombinant microorganism of the invention.

Abstract: The present disclosure concerns recombinant yeast host cell for saccharification of a biomass. The recombinant yeast host cell has a genetic modification for expressing a heterologous polypeptide having glucoamylase activity (Penicillum oxalicum glucoamylase). In some embodiments, the heterologous polypeptide can comprise a signal sequence. The present disclosure also concerns a process for saccharification of a biomass using the recombinant yeast host cell as well as a process for fermenting the saccharified biomass into a fermentation product.

Abstract: The present invention provides for novel metabolic pathways to reduce or modulate glycerol production and increase product formation. More specifically, the invention provides for a recombinant microorganism comprising one or more native and/or heterologous proteins that function to import glycerol and one or more native and/or heterologous enzymes that function in one or more engineered metabolic pathways to convert a carbohydrate source, such as lignocellulose, to a product, such as ethanol, wherein the one or more native and/or heterologous proteins or enzymes is activated, upregulated, or downregulated.

Abstract: The present disclosure relates to recombinant yeast host cells having (i) a first genetic modification for reducing the production of one or more native enzymes that function to produce glycerol or regulating glycerol synthesis and/or allowing the production of an heterologous glucoamylase and (ii) a second genetic modification for reducing the production of one or more native enzymes that function to produce trehalose or regulating trehalose synthesis and/or allowing the expression of an heterologous trehalase. The recombinant yeast host cells can be used to limit the production of (yeast-produced) trehalose (particularly extracellular trehalose) during fermentation and, in some embodiments, can increase the production of a fermentation product (such as, for example, ethanol).

Abstract: The present disclosure concerns a recombinant yeast host cell exhibiting higher stability and, in some embodiments, higher fermentation performance. The recombinant yeast host cell stability has a limited ability to express an hydrolase during its propagation phase. In return, this limits the cleavage of a yeast cellular component during or after propagation which may be detrimental to the stability and/or fermentation performances. The recombinant yeast host cell expresses a heterologous hydrolase under the control of a heterologous promoter (for limiting the expression of the heterologous hydrolase during propagation and favoring the expression of the heterologous hydrolase during fermentation).

Abstract: The present disclosure relates to the modulation in the RAS/cAMP/PKA signaling pathway for maintaining the propagation efficiency and increasing fermentation efficiency of yeast cells. The present disclosure provides yeast cells having or engineered to exhibit a modulation in signaling in a RAS/cAMP/PKA pathway, depending on conditions. For example the yeast cells can be selected or genetically modified to express a mutated Ras1 protein, a mutated Ras2 protein, a mutated Ira1 protein and/or a mutated Ira2 protein, optionally in combination with specific promoters. Also provided herewith are methods for propagating the yeast cells as well as using the yeast cells to generate a fermented product (such as ethanol).

Abstract: The present invention provides for novel metabolic pathways to reduce or modulate glycerol production and increase product formation. More specifically, the invention provides for a recombinant microorganism comprising one or more native and/or heterologous proteins that function to import glycerol and one or more native and/or heterologous enzymes that function in one or more engineered metabolic pathways to convert a carbohydrate source, such as lignocellulose, to a product, such as ethanol, wherein the one or more native and/or heterologous proteins or enzymes is activated, upregulated, or downregulated.

Abstract: The present invention provides for a mechanism to completely replace the electron accepting function of glycerol formation with an alternative pathway to ethanol formation, thereby reducing glycerol production and increasing ethanol production. In some embodiments, the invention provides for a recombinant microorganism comprising a down-regulation in one or more native enzymes in the glycerol-production pathway. In some embodiments, the invention provides for a recombinant microorganism comprising an up-regulation in one or more enzymes in the ethanol-production pathway.

Abstract: The present disclosure relates to recombinant yeast host cells having (i) a first genetic modification for reducing the production of one or more native enzymes that function to produce glycerol or regulating glycerol synthesis and/or allowing the production of an heterologous glucoamylase and (ii) a second genetic modification for reducing the production of one or more native enzymes that function to produce trehalose or regulating trehalose synthesis and/or allowing the expression of an heterologous trehalase. The recombinant yeast host cells can be used to limit the production of (yeast-produced) trehalose (particularly extracellular trehalose) during fermentation and, in some embodiments, can increase the production of a fermentation product (such as, for example, ethanol).

Abstract: The present disclosure concerns using an inactivated yeast product made from a yeast host cell to increase the yield of a fermentation product from a fermenting yeast host cell. The inactivated yeast extract can be formulated as a liquefaction or fermentation additive and can be used to improve the yield of a fermented product such as ethanol.

Abstract: The present disclosure relates to proteases for improving alcoholic fermentation. The proteases are expressed from a recombinant host cell. The present disclosure also provides a population of recombinant host cells expressing an heterologous protease that can be used in combination with recombinant host cells expressing an heterologous glucoamylase and/or an heterologous glycerol reduction system.

Abstract: The present disclosure relates to recombinant yeast host cells having (i) a first genetic modification for reducing the production of one or more native enzymes that function to produce glycerol or regulating glycerol synthesis and/or allowing the production of an heterologous glucoamylase and (ii) a second genetic modification for reducing the production of one or more native enzymes that function to produce trehalose or regulating trehalose synthesis and/or allowing the expression of an heterologous trehalase. The recombinant yeast host cells can be used to limit the production of (yeast-produced) trehalose (particularly extracellular trehalose) during fermentation and, in some embodiments, can increase the production of a fermentation product (such as, for example, ethanol).

Abstract: 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 corn starch, corn fiber, lignocellulose, (including enzymes that hydrolyze linkages in cellulose, hemicellulose, 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.

Abstract: The present disclosure concerns the recombinant expression of thermostable alpha-amylases in a yeast host cell, compositions and yeast products made from the recombinant yeast host cells as well as the use of the thermostable alpha-amylase for hydrolyzing starch and ultimately making a fermentation product.

Abstract: The present invention provides for novel metabolic pathways to convert biomass and other carbohydrate sources to malonyl-CoA derived products, such as hydrocarbons and other bioproducts, under anaerobic conditions and with the net production of ATP. More specifically, the invention provides for a recombinant microorganism comprising one or more native and/or heterologous enzymes that function in one or more engineered metabolic pathways to achieve conversion of a carbohydrate source to, e.g., long-chain hydrocarbons and hydrocarbon derivatives, wherein the one or more native and/or heterologous enzymes is activated, upregulated, downregulated, or deleted. The invention also provides for processes to convert biomass to malonyl-CoA derived products which comprise contacting a carbohydrate source with a recombinant microorganism of the invention.

Abstract: The present disclosure concerns a symbiotic combination of host cells engineered to produce a first metabolic product, for example a carbohydrate, and to convert the second metabolic product into a second metabolic product, for example an alcohol.