NOVELTY - A DNA construct or recombinant expression vector comprising an isolated polynucleotide which comprises a nucleotide sequence that encodes a growth hormone (GH)-61 polypeptide having cellulolytic enhancing activity, is new. The isolated polynucleotide is operably linked to one or more heterologous control sequences that direct the production of the polypeptide in an expression host.    USE - The DNA construct or recombinant expression vector is useful for producing GH61 polypeptide having cellulolytic enhancing activity, degrading and fermenting cellulosic material, producing fermentation product (all claimed).    ADVANTAGE - The DNA construct or vector cost-effectively degrades cellulosic material.    DETAILED DESCRIPTION - A DNA construct or recombinant expression vector comprising an isolated polynucleotide which comprises a nucleotide sequence that encodes a growth hormone (GH)-61 polypeptide having cellulolytic enhancing activity, is new. The isolated polynucleotide is operably linked to one or more heterologous control sequences that direct the production of the polypeptide in an expression host. The GH61 polypeptide having cellulolytic enhancing activity is chosen from (a) a GH61 polypeptide having at least 95% sequence identity to amino acids at positions 18-227 of an 227 amino acid sequence (SEQ ID NO: 6) fully defined in the specification, (b) a GH61 polypeptide encoded by a polynucleotide that hybridizes under very high stringency conditions with (i) nucleotides at positions 52-795 of a 798 base pair sequence (SEQ ID NO: 5) fully defined in the specification, (ii) the cDNA sequence of nucleotides at positions 52-795 of base pair sequence of SEQ ID NO: 5, or (iii) the full-length complement of (i) or (ii), where very high stringency conditions are defined as prehybridization and hybridization at 42 degrees C in 5X sodium chloride-sodium phosphate monobasic-EDTA (SSPE), 0.3% sodium dodecyl sulfate (SDS), 200 mu g/ml sheared and denatured salmon sperm DNA, and 50% formamide and the polynucleotide is washed for 3 times each for 15 minutes using 2X saline-sodium citrate (SSC) and 0.2% SDS at 70 degrees C, (c) a GH61 polypeptide encoded by a polynucleotide having at least 99% sequence identity to nucleotides at positions 52-795 of the base pair sequence of SEQ ID NO: 5, or a GH61 polypeptide encoded by the cDNA of nucleotides at positions 52-795 of the base pair sequence of SEQ ID NO: 5, and (d) an isolated fragment of a GH61 polypeptide of (a), (b), or (c) that has cellulolytic enhancing activity. The DNA construct comprises a nucleic acid encoding a signal peptide comprising amino acids at positions 1-17 of SEQ ID NO: 6, where the nucleic acid is operably linked to a heterologous nucleic acid encoding a protein. INDEPENDENT CLAIMS are included for the following: (1) recombinant host cell comprising (i) the DNA construct or recombinant expression vector, or (ii) a nucleic acid encoding a protein, where the nucleic acid is operably linked to an isolated polynucleotide encoding a signal peptide comprising amino acids at positions 1-17 of SEQ ID NO: 6, and the nucleic acid is foreign to the polynucleotide encoding the signal peptide; (2) method (M1) of producing GH61 polypeptide having cellulolytic enhancing activity, involves (a) (i) cultivating the recombinant host cell under conditions conducive for production of the polypeptide, and (ii) recovering the polypeptide, (b) (i) cultivating an isolated Thielavia terrestris cell under conditions conducive for production of the polypeptide, and (ii) recovering the polypeptide, or (c) (i) cultivating the transgenic plant or plant cell under conditions conducive for production of the polypeptide, and (ii) recovering the polypeptide; (3) method (M2) of producing a protein, involves (a) cultivating the recombinant host cell under conditions conducive for production of the protein, and (b) recovering the protein; (4) transgenic plant, plant part or plant cell transformed with the polynucleotide encoding the GH61 polypeptide having cellulolytic enhancing activity, where the polypeptide comprises a signal peptide directing the polypeptide into secretory pathway; (5) method (M3) for degrading a cellulosic material, involves (i) treating the cellulosic material with an enzyme composition in the presence of the GH61 polypeptide having cellulolytic enhancing activity, and (ii) recovering the degraded cellulosic material; (6) method (M4) for producing a fermentation product, involves (i) saccharifying a cellulosic material with an enzyme composition in the presence of the GH61 polypeptide having cellulolytic enhancing activity, (ii) fermenting saccharified cellulosic material with one or more fermenting microorganisms to produce the fermentation product, and (ii) recovering the fermentation product from the fermentation; and (7) method (M5) of fermenting a cellulosic material, involves (i) fermenting the cellulosic material with one or more fermenting microorganisms, where the cellulosic material is saccharified with an enzyme composition in the presence of the polypeptide having cellulolytic enhancing activity, and the fermentation of the cellulosic material produces a fermentation product, and (ii) recovering the fermentation product from the fermentation.