The present invention relates to variants of alpha amylase. The present invention also relates to polynucleotides encoding the variants; nucleic acid constructs, vectors, and host cells comprising the polynucleotides; and methods of using the variants.

A fungal alpha-amylase is provided from Aspergillus fumigatus (AfAmyl). AfAmyl has an optimal pH of 3.5 and is operable at 30-75 degrees C., allowing the enzyme to be used in combination with a glucoamylase and an isoamylase in a saccharification reaction. This obviates the necessity of running a saccharification reaction as a batch process, where the pH and temperature must be readjusted for optimal use of the alpha-amylase or glucoamylase. AfAmyl also catalyzes the saccharification of starch substrates to an oligosaccharide composition significantly enriched in DP2 and (DPI+DP2) compared to the products of saccharification catalyzed by an alpha-amylase from Aspergillus kawachii. This facilitates the utilization of the oligosaccharide composition by a fermenting organism in a simultaneous saccharification and fermentation process, for example.

The present disclosure relates to isolated polypeptides having alpha-amylase activity, polynucleotides encoding the polypeptides, nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods of producing the polypeptides, and method of using polypeptides, including in ethanol production processes.

The present invention relates to an alpha amylase enzyme and to its use in the food, feed and non-food industry.

Provided are fungal host strains and recombinant DNA constructs for creation and use thereof, wherein the fungal host strains are particularly stable and useful for expressing proteins, enzymes, variants and other substances of interest in a reliable or less variable fashion.

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 leader peptide which promotes the secretion of recombinant proteins and a nucleic acid sequence encoding the leader peptide as well as expression cassettes, vectors and host cells comprising this leader sequence. Also disclosed is a method for producing a protein using this leader peptide.

Disclosed herein is a method for expressing phytase in a filamentous fungus by using an optimized Escherichia coli phytase gene having a nucleotide sequence as shown in SEQ ID NO. 7 and a signal peptide having a nucleotide sequence as shown in SEQ ID NO. 12.

The present disclosure relates to recombinant yeast strains capable of maintaining their robustness at high temperature as well as recombinant proteins expressed therefrom. The present disclosure also provides methods for using the recombinant yeast strain for making a fermentation product. The present disclosure further process a process for making recombinant yeast strains capable of maintaining their robustness at high temperature.

The invention provides an animal feed composition comprising plant material from a transgenic plant or plant part expressing a recombinant thermotolerant α-amylase. The invention further provides methods of improving feed utilization and decreasing liver abscesses. Also provided are methods of producing a steam flaked corn product, and the steam flaked corn product so produced.