NOVELTY - Degrading biomass or pretreated biomass to sugars involves using an enzyme comprising a polypeptide: having a specific polypeptide sequence; or a polypeptide sequence encoded by specific nucleic acid sequence; or a polypeptide sequence encoded by a nucleic acid sequence hybridizing under stringent conditions to specific polynucleotide; or a polypeptide sequence encoded by a nucleic acid sequence hybridizing under stringent conditions to the reverse complement of specific polynucleotide.    USE - For degrading biomass or pretreated biomass to sugars.    ADVANTAGE - The enzymes exhibit lower production costs, higher specificity towards the substrate, greater synergies with existing enzymes, less antigenic effect, less undesirable side activities, higher yields when produced in a suitable microorganism, more suitable pH and temperature ranges, and better properties of the final product; have high specific activity, stability, or resistance to inhibitors, and thus improve the efficiency of the process; improve the degradation and conversion of plant cell wall polysaccharides by composing cellulase mixtures using cellulase enzymes with such properties; and are able to function at extremes of pH and temperature, both since improved enzyme robustness decreases costs, and because enzymes that function at high temperature allow high processing temperatures under high substrate consistency conditions that decrease viscosity and improve yields.    DETAILED DESCRIPTION - Degrading biomass or pretreated biomass to sugars involves using an enzyme comprising a polypeptide having: (a) a polypeptide sequence of SEQ ID NO: 3; (b) a polypeptide that is at least 60%, preferably at least 90%, especially at least 99% homologous to SEQ ID NO: 3; (c) a polypeptide sequence encoded by nucleic acid sequence of SEQ ID NO: 1 and SEQ ID NO: 2 or nucleic acids that are at least 60%, preferably at least 90%, especially at least 99% homologous to SEQ ID NO: 1 or SEQ ID NO: 2; (d) a polypeptide sequence encoded by a nucleic acid sequence hybridizing under stringent conditions to the polynucleotide of SEQ ID NO: 1 or SEQ ID NO: 2; or (e) a polypeptide sequence encoded by a nucleic acid sequence hybridizing under stringent conditions to the reverse complement of a polynucleotide of SEQ ID NO: 1 or SEQ ID NO: 2. All above undefined sequences are as available on WIPO website (sequences not defined here may be found at ftp://ftp.wipo.int/pub/published pct sequences/publication).