Protein deamidase

The invention provides a novel protein deamidase. The invention discloses protein deamidase. The present invention comprises any one of the following polypeptides: a polypeptide comprising an amino acid sequence represented by any one of SEQ ID NO: 1 to 11 or a partial sequence thereof (the amino acid sequence at positions 338 to 515 in SEQ ID NO: 1, positions 381 to 564 in SEQ ID NO: 2, positions 122 to 309 in SEQ ID NO: 4, positions 1 to 146 in SEQ ID NO: 5, positions 19 to 235 in SEQ ID NO: 6, positions 19 to 205 in SEQ ID NO: 6, positions 10 to 303 in SEQ ID NO: 7, positions 10 to 186 in SEQ ID NO: 7, positions 162 to 426 in SEQ ID NO: 9, or positions 162 to 341 in SEQ ID NO: 9); a polypeptide having protein glutaminase activity and comprising an amino acid sequence obtained by substitution, addition, insertion or deletion of one or more amino acids in the amino acid sequence represented by any one of SEQ ID NO: 1 to SEQ ID NO: 11 or a partial sequence thereof; or a polypeptide which comprises an amino ac