Polypeptides Having Xylanase Activity and Polynucleotides Encoding Same

An isolated polypeptide comprising a catalytic domain selected from the group consisting of:

• (a) a catalytic domain having at least 77% sequence identity to the catalytic domain of SEQ ID NO:
• 2 or SEQ ID NO:
• 4;
• (b) a catalytic domain encoded by a polynucleotide having at least 60% sequence identity to the catalytic domain coding sequence of SEQ ID NO:
• 1 or SEQ ID NO:
• 3;
• (c) a variant of a catalytic domain comprising a substitution, deletion, and/or insertion of one or more (several) amino acids of the catalytic domain of SEQ ID NO:
• 2 or SEQ ID NO:
• 4;
• and
• (d) a fragment of a catalytic domain of (a), (b), or (c), which has xylanase activity.

A recombinant host cell transformed with a nucleic acid construct or expression vector comprising a polynucleotide operably linked to one or more control sequences that direct the production of a polypeptide in the recombinant host cell, wherein the polypeptide is selected from the group consisting of:

• (a) a polypeptide having at least 77% sequence identity to the mature polypeptide of SEQ ID NO:
• 2, or a polypeptide having at least 77% sequence identity to the mature polypeptide of SEQ ID NO:
• 4;
• (b) a polypeptide encoded by a polynucleotide that hybridizes under low stringency conditions with (i) the mature polypeptide coding sequence of SEQ ID NO:
• 1 or SEQ ID NO:
• 3, (ii) the cDNA sequence thereof, or (iii) the full-length complement of (i) or (ii);
• (c) a polypeptide encoded by a polynucleotide having at least 60% sequence identity to the mature polypeptide coding sequence of SEQ ID NO:
• 1 or SEQ ID NO:
• 3;
• or the cDNA sequence thereof;
• (d) a variant of the mature polypeptide of SEQ ID NO:
• 2 or SEQ ID NO:
• 4 comprising a substitution, deletion, and/or insertion at one or more positions;
• and
• (e) a fragment of the polypeptide of (a), (b), (c), or (d) that has xylanase activity.