NOVELTY - A protein having cellulose-xyloglucan endotransglucosylase activity, is new.    USE - The protein is useful for producing transgenic plant chosen from cotton, wheat, canola, rice, corn, soy bean, Sorghum, sunflower, tobacco, sugar beet, maize, barley, tomato, mango, peach, apple, pear, strawberry, banana, melon, potato, carrot, lettuce, cabbage, onion, sugar cane, pea, poplar, grape, citrus, alfalfa, rye, oat, turf, forage grass, flax, nut producing plant and wood producing plants, food, or feed chosen from oil, meal, grain, starch, flour and protein, industrial product chosen from biofuel, fiber, industrial chemical, pharmaceutical and nutraceutical and cellulosic material with improved properties chosen from fabric, paper, cellulose derivative, package material, building material, thickening agent, medical dressing, cellophane, dialysis tubing and resin for chromatography columns (all claimed).    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) isolated nucleic acid molecule chosen from (a) (a) nucleic acid molecule comprising sequence encoding the above-mentioned protein, (b) nucleic acid molecule comprising sequence having at least 60% sequence identity with respect to sequence of SEQ ID NOs: 1, 5 and 7, (c) nucleic acid molecule comprising sequence having at least 60% sequence identity with respect to sequence at position 64-840, 76-849, and 85-861 respectively of SEQ ID NOs: 1, 5 and 7, and (d) nucleic acid molecule comprising complementary sequence with respect to sequence of SEQ ID NOs: 1, 5 and 7 hybridized under high stringency conditions;    (2) chimeric gene comprising operably linked elements chosen from (a) promoter, preferably expressible in plants, (b) nucleic acid molecule capable of modulating expression of above-mentioned protein, and optionally (c) transcription termination and polyadenylation region;    (3) vector comprising the chimeric gene;    (4) host cell transformed with the chimeric gene or vector;    (5) transgenic plant, plant part or seed comprising the chimeric gene, vector and host cell;    (6) method (M1) of producing transgenic plant involves (a) providing a chimeric gene or vector, (b) introducing the chimeric gene or vector into a plant to obtain product;    (7) method (M2) of altering at least one fiber property in fiber-producing plant or for strengthening plant cell walls of a plant involves expressing the chimeric gene or vector in the fiber-producing plant or plant;    (8) method (M3) for producing a cellulosic material with improved properties involves contacting the cellulosic material with suitable amount of protein in presence of xyloglucan to which an organic or inorganic molecule is covalently attached;    (9) method (M4) for producing the protein involves culturing the host cell and isolating the protein;    (10) kit comprising cellulosic material, xyloglucan and/or xyloglucan oligosaccharide and protein;    (11) antibody directed to the protein; and    (12) method (M5) of producing food, feed, or an industrial product involves (a) obtaining the plant or its part, and (b) preparing the food, feed or industrial product from the plant or its part.