NOVELTY - A polypeptide comprising amino acid sequence of SEQ ID NO: 2 or amino acid sequence encoded by nucleotide sequence of SEQ ID NO: 1, or their variant polypeptide or variant polynucleotide, is new. The variant polynucleotide exhibits at least 82% sequence identity with the base pair sequence of SEQ ID NO: 1. The variant polypeptide exhibits at least 82% sequence identity with the amino acid sequence of SEQ ID NO: 2. Sequences not defined here may be found at ftp://ftp.wipo.int/pub/published_pct_sequences/publication.    USE - The polypeptide is useful for producing sugar from substrate comprising carbohydrate material, preferably plant material chosen from plant, plant pulp, plant extract, foodstuff, ingredient derived from fabric, textile or item of clothing and ligno-cellulosic material. The polynucleotide is useful in vector and cell for producing transgenic plant chosen from corn plant, Sorghum plant, tomato plant, wheat plant, oilseed plant, rapeseed plant, soybean plant, barley plant, grass, tobacco plant, Anacardium, Arachis, Asparagus, Atropa, Avena, Brassica, Citrus, Citrullus, Capsicum, Carthamus, Cocos, coffee, Cucumis, Cucurbita, Daucus, Elaeis, Fragaria, Gossypium, Helianthus, Acilius, Hordeum, Hyoscyamus, Lactuca, Linum, Lolium, Lupinus, Lycopersicon, Majorana, Medicago, Nicotiana, Olea, Oryza, Pennisetum, Persea, Pistacia, Pisum, Pyrus, Prunus, Raphanus, Ricinus, Secale, Senecio, Sinapis, Theobroma, Trigonella, Triticum, Vicia, Vitis, Vigna and Zea (all claimed).    ADVANTAGE - The polypeptide has improved activity.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) polynucleotide comprising a nucleotide sequence of SEQ ID NO: 1, nucleotide sequence capable of selectively hybridizing with a polynucleotide having the reverse complement of SEQ ID NO: 1, nucleotide sequence exhibiting at least 80% sequence identity with the nucleotide sequence of SEQ ID NO: 1, fragment containing at least 100 nucleotides in length of a nucleotide sequence of SEQ ID NO: 1, sequence which is degenerate as a result of the genetic code to the nucleotide sequence of SEQ ID NO: 1, or nucleotide sequence which is the reverse complement of the nucleotide sequence of SEQ ID NO: 1;    (2) nucleic acid construct comprising the polynucleotide;    (3) vector comprising the polynucleotide sequence;    (4) cell comprising the polynucleotide, nucleic acid construct or vector;    (5) transgenic plant or its portion comprising the polynucleotide, nucleic acid construct, vector or cell;    (6) method for preparation of the polypeptide;    (7) composition comprising (i) polypeptide and (ii) cellulase and/or hemicellulase and/or pectinase and/or polypeptide belonging to family GH61; and    (8) method for treatment of a substrate comprising carbohydrate material, optionally a plant material, involves contacting the substrate with the polypeptide.