Polypeptides having cellulolytic enhancing activity and polynucleotides encoding same

An isolated GH61 polypeptide having cellulolytic enhancing activity, selected from the group consisting of:

• (a) a GH61 polypeptide having at least 95% sequence identity to amino acids 18to 246 of SEQ ID NO:
• 2;
• (b) a GH61 polypeptide encoded by a polynucleotide that hybridizes under very high stringency conditions with (i) nucleotides 52 to 875 of SEQ ID NO:
• 1, (ii) the cDNA sequence contained in the mature polypeptide coding sequence of SEQ ID NO:
• 1, or (iii) the full-length complement of (i) or (ii), wherein very high stringency conditions are defined as prehybridization and hybridization at 42° C. in 5X SSPE, 0.3% SDS, 200 micrograms/ml sheared and denatured salmon sperm DNA, and 50% formamide and washing three times each for 15 minutes using 2X SSC, 0.2% SDS at 70° C.;
• (c) a GH61 polypeptide encoded by a polynucleotide having at least 99% sequence identity to nucleotides 52 to 875 of SEQ ID NO:
• 1 or the cDNA sequence thereof;
• and
• (d) an isolated fragment of a GH61 polypeptide of (a), (b), or (c) that has cellulolytic enhancing activity.