A phytase having improved thermostability is disclosed. The phytase has a modified amino acid sequence of SEQ ID NO: 2, wherein the modification is one of mutations A to D. The mutation A is to substitute amino acids at positions 143 and 262 with cysteine, the mutation B is to substitute amino acids at positions 259 and 312 with cysteine, the mutation C is to substitute amino acids at positions 205 and 257 with cysteine, and the mutation D is to substitute amino acids at positions 264 and 309 with cysteine.

Provided herein are variants of Buttiauxella sp. phytases that may be used in industrial applications including methods for starch liquefaction, alcohol fermentations and for enhancing phosphate digestion in foods and animal feeds.

Provided herein are variants of Buttiauxella sp. phytases that may be used in industrial applications including methods for starch liquefaction, alcohol fermentations and for enhancing phosphate digestion in foods and animal feeds.

The present teachings provide modified enzymes, preferably phytases, which have increased stability, hypothesized to arise from increased glycosylation. The enzymes can be modified to introduce or increase the number of glycosylation sites in the amino acid sequence, or glycosylation can be increased by the use of specific host production methods, or both. The enzymes of the present teachings have an increased stability after treatment at elevated temperature, which can be measured by inactivity reversibility or percent recovery following a treatment such as heating. The enzymes of the present teachings find application for example in food, feed, and feed pelleting.

The present invention relates to variant phytase enzymes and their use thereof.

A thermostable phytase variant, a method for its manufacturing, an animal feed, a feed supplement, a dry and a liquid formulation, a method of degrading phytic acid, a method of manufacturing a phytase variant, a method of manufacturing a feed pellet, and a recombinant host cell configured to produce at least one polypeptide are disclosed, wherein the phytase variant comprises amino acid substitutions and has at least 80% amino acid sequence identity with amino acids of SEQ ID NO: 1.

Provided herein are variants of Buttiauxella sp. phytases that may be used in industrial applications including methods for starch liquefaction, alcohol fermentations and for enhancing phosphate digestion in foods and animal feeds.

The invention relates to the use of at least one bacterial phytase in combination with one or more protease(s) in animal feed for improving weight gain and/or Feed Conversion Ratio (FCR), wherein the phytase is administered in one or more of the following amounts (dosage ranges): 1,000 FYT/kg feed, 2,000 FYT/kg feed 3,000 FYT/kg feed and wherein the protease is administered in one of the following amounts (dosage ranges): 10,000 units/kg feed, 11,000, 12,000, 13,000, 14,000, 15,000, 16,000, 17,000, 18,000, 19,000, 20,000 units/kg feed.

Fusion-proteins containing an enzyme, preferably a feed or food enzyme, coupled to a gut surface-binding domain are presented. The fusion-proteins can be used to promote feed utilization in animals. In a particular example, a Fusion enzyme according to the invention comprising a gut-surface-binding polypeptide segment linked to a phytase show an increased resident time in the gut, which leads to an increased amount of time given to the enzyme to catalyse the corresponding reaction which finally leads to improved feed utilisation.

The present invention relates to a method for producing phytase variants which has at least 74% identity to a phytase derived from Citrobacter braakii and comprises at least two additional disulfide bonds as compared to this phytase. These phytase variants have modified, preferably improved, properties, such as thermostability, temperature profile, pH profile, specific activity, performance in animal feed, reduced protease sensitiliby, and/or an modified glycosylation pattern. The invention also relates to the variants produced, DNA encoding these phytases, methods of their production, as well as the use thereof, e.g., in animal feed and animal feed additives.