Patent ID: 9719098
Date: 2017-08-01
CPC Classifications: C12N,C12P,C12Y,Y02E

Claim:
1. A recombinant yeast comprising: (a) a deletion of one or more native enzymes that function to produce glycerol and/or regulate glycerol synthesis, wherein said one or more enzymes is encoded by a gpd1, gpd2, gpp1, gpp2 or fps1 polynucleotide; and (b) one or more native and/or heterologous enzymes that function in one or more engineered metabolic pathways to convert a carbohydrate source to ethanol, wherein one of said metabolic pathways comprises conversion of pyruvate to acetyl-CoA and formate by a pyruvate formate lyase, wherein one of said metabolic pathways comprises conversion of acetyl-CoA to ethanol by an acetaldehyde dehydrogenase, alcohol dehydrogenase, or a bifunctional acetaldehyde/alcohol dehydrogenase, and wherein said one or more native and/or heterologous enzymes is activated, upregulated or downregulated.