The present invention relates to isolated polypeptides having alpha-amylase activity, catalytic domains, carbohydrate binding domains and polynucleotides encoding the polypeptides, catalytic domains or carbohydrate binding domains. The invention also relates to nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods of producing and using the polypeptides, catalytic domains or carbohydrate binding domains.

The present invention relates to isolated polypeptides having alpha-amylase activity, catalytic domains, carbohydrate binding domains and polynucleotides encoding the polypeptides, catalytic domains or carbohydrate binding domains. The invention also relates to nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods of producing and using the polypeptides, catalytic domains or carbohydrate binding domains.

The present invention relates to a raw starch hydrolysis processes for producing a fermentation product.

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.

An Aspergillus oryzae and its application belong to the field of microbiology and food processing technology. The present application, on the one hand, provides an Aspergillus oryzae (WZ-212), on the other hand, provides this Aspergillus oryzae in application of enhancing the inhibitory activity of α-glucosidase by grapefruit peel and the method of application. Using the Aspergillus oryzae of this application to treat grapefruit peel, the inhibition of α-glucosidase activity by grapefruit peel extract was significantly enhanced, and the process is simple, low cost, which is easy to achieve industrial production.

Described are methods and compositions relating to granular starch-converting glucoamylases and α-amylases. The enzymes can be used to perform enzymatic starch hydrolysis of granular starch at or below the gelatinization temperature of insoluble granular starch.

The present invention relates to a hybrid polypeptide having alpha-amylase activity, selected from a first polypeptide sequence comprising a catalytic core, and a second polypeptide sequence comprising a carbohydrate binding module (CBM), wherein (a) the catalytic core is selected from a polypeptide having at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99% or 100% sequence identity to amino acids 20 to 494 of SEQ ID NO: 1 or amino acids 20 to 496 of SEQ ID NO: 1; and (b) the CBM is selected from a polypeptide having at least 75%, at least 80%, at least 85%, at least 90%, at least 91%, at least 92%, at least 93%, at least 94%, at least 95%, at least 96%, at least 97%, at least 98%, at least 99% or 100% sequence identity to SEQ ID NO: 4, SEQ ID NO: 5, or SEQ ID NO: 6. The invention also relates to nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods of producing and using the polypeptides, and catalytic domains.

The present invention provides for an Aspergillus niger host cell comprising a gene of interest operatively linked to an ecm33 promoter of an ascomycete fungi, wherein the gene of interest is heterologous to the ecm33 promoter and/or to Aspergillus niger. In some embodiments, the gene of interest is a glycoside hydrolase enzyme. In some embodiments, the glycoside hydrolase enzyme is a glucosidase.

The invention relates to enzyme compositions comprising a glucoamylase, an alpha-amylase, and optionally a cellulolytic composition and/or a protease. The invention also relates to the use thereof in processes of producing sugars and/or fermentation products from starch-containing material by saccharifying and/or fermenting starch-containing material at a temperature below the initial gelatinization temperature.

Described herein are recombinant fermenting organisms having a heterologous polynucleotide encoding an alpha-amylase and/or a heterologous polynucleotide encoding a trehalase. Also described are processes for producing a fermentation product, such as ethanol, from starch or cellulosic-containing material with the recombinant fermenting organisms.