TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Composition: The composition further comprises cellulose capable of being cleaved by the GH5 to produce cellobiose, IL and one or more thermostable or thermophilic endoglucanase enzymes. The temperature of the composition is at least 65 degrees C, preferably at least 80 degrees C. The pH of the composition is 4.7-5.5. Preferred Polypeptide: The polypeptide further comprises a second amino acid sequence exhibiting at least 70% homology to amino acid sequence of C.saccharolyticus carbohydrate-binding module family 3 (CBM3) and the sequence is capable of binding a carbohydrate. The first amino acid sequence exhibits at least 80, 90, 95 or 99% homology to amino acid sequence of C.saccharolyticus GH5 and comprises amino acid sequence including residues 636-975 of C.saccharolyticus CBH. The second amino acid sequence exhibits at least 80, 90, 95 or 99% homology to amino acid sequence of C.saccharolyticus CBM3 and comprises amino acid sequence including residues 424-506 of C.saccharolyticus CBH. Preferred Liquid: The ionic liquid comprises 1-alkyl-3-alkylimidazolium alkanate, 1-alkyl-3-alkylimidazolium alkylsulfate, 1-alkyl-3-alkylimidazolium methylsulfonate, 1-alkyl-3-alkylimidazolium hydrogensulfate, 1-alkyl-3-alkylimidazolium thiocyanate or 1-alkyl-3-alkylimidazolium halide, where alkyl represents 1-10C alkyl and alkanate represents 1-10C alkanate. The ionic liquid preferably comprises 1-ethyl-3-methylimidazolium acetate (EMIM acetate), EMIM chloride, EMIM hydrogensulfate, EMIM methylsulfate, EMIM ethylsulfate, EMIM methanesulfonate, EMIM tetrachloroaluminate, EMIM thiocyanate, 1-butyl-3-methylimidazolium acetate (BMIM acetate), BMIM chloride, BMIM hydrogensulfate, BMIM methanesulfonate, BMIM methylsulfate, BMIM tetrachloroaluminate, BMIM thiocyanate, 1-ethyl-2,3-dimethylimidazolium (EDIM) ethylsulfate, tris-(2-hydroxyethyl)methylammonium (MTEOA) methylsulfate, 1-methylimidazolium (MIM) chloride, MIM hydrogen sulfate, 1,2,4-trimethylpyrazolium methylsulfate, tributylmethylammonium methylsulfate, choline acetate, and choline salicylate. The concentration of ionic liquid in the solution is 0, 1, 5, 10 or 20% or more. EXAMPLE - No suitable example given.