Glucanases, nucleic acids encoding them and methods for...

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/56 (2006.01) A01H 1/00 (2006.01) A01H 5/00 (2006.01) A01H 5/10 (2006.01) A01K 67/027 (2006.01) A21D 13/00 (2006.01) A23C 9/137 (2006.01) A23K 1/00 (2006.01) A23K 1/165 (2006.01) A23L 1/00 (2006.01) A23L 2/00 (2006.01) A61K 31/7088 (2006.01) C07H 3/00 (2006.01) C07H 21/00 (2006.01) C07K 1/12 (2006.01) C07K 7/08 (2006.01) C07K 14/195 (2006.01) C07K 14/37 (2006.01) C07K 16/40 (2006.01) C07K 17/00 (2006.01) C07K 19/00 (2006.01) C08L 1/00 (2006.01) C11D 7/42 (2006.01) C12N 1/15 (2006.01) C12N 1/19 (2006.

Patent

CA 2529403

The invention relates to polypeptides having glucanase, e.g., endoglucanase, mannanase, xylanase activity or a combination of these activities, and polynucleotides encoding them. In one aspect, the glucanase activity is an endoglucanase activity (e.g., endo-1,4-beta-D-glucan 4-glucano hydrolase activity) and comprises hydrolysis of 1,4-beta-D-glycosidic linkages in cellulose, cellulose derivatives (e.g., carboxy methyl cellulose and hydroxy ethyl cellulose) lichenin, beta-1,4 bonds in mixed beta-1,3 glucans, such as cereal beta-D-glucans or xyloglucans and other plant material containing cellulosic parts. In addition, methods of designing new enzymes and methods of use thereof are also provided. In alternative aspects, the new glucanases e.g., endoglucanases, mannanases, xylanases have increased activity and stability at increased pH and temperature.

L'invention concerne des polypeptides comprenant une activité de la glucanase, par exemple de l'endoglucanase, de la mannanase, de la xylanase, ou une combinaison de leurs activités, et des polynucléotides les codant. Dans un mode de réalisation, l'activité de la glucanase présente une activité d'endoglucanase (par exemple une activité endo-1,4-beta-D-glucan 4-glucano hydrolase) et comprend l'hydrolyse de 1,4-beta-D-glycosidic de liaisons dans la cellulose, des dérivés de la cellulose (par exemple, carboxy methyl cellulose and hydroxy ethyl cellulose) lichénine, beta-1,4 liée dans des béta-1,3 glucanes, tels que des beta-D-glucanes de céréales ou des xyloglucanes et d'autres matières végétales contenant des parties cellulosiques. De plus, l'invention concerne des procédés permettant de désigner de nouvelles enzymes ainsi que leurs procédés d'utilisation. Dans d'autres modes de réalisation, les nouvelles glucanases, par exemple des endoglucanases, mannanases, xylanases présentent une activité et une stabilité améliorée à des températures et un pH augmentés.

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