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    • 9. 发明授权
    • Modification of xylanase to improve thermophilicity, alkalophilicity and
thermostability
    • 改良木聚糖酶以改善嗜热性,嗜碱性和热稳定性
    • US5759840A
    • 1998-06-02
    • US709912
    • 1996-09-09
    • Wing L. SungMakoto YaguchiKazuhiko Ishikawa
    • Wing L. SungMakoto YaguchiKazuhiko Ishikawa
    • C12N15/09C12N9/24C12N15/00C12N15/56C12R1/09C12R1/885D21C5/00D21C9/10
    • C12Y302/01032C12N9/248C12Y302/01008D21C5/005C07K2319/00
    • Producing a xylanase enzyme of superior performance in the bleaching of pulp. More specifically, a modified xylanase of Family 11 that shows improved thermophilicity, alkalophilicity, and thermostability as compared to the natural xylanase. The modified xylanases contain any of three types of modifications: (1) changing amino acids 10, 27, and 29 of Trichoderma reesei xylanase II or the corresponding amino acids of another Family 11 xylanase, where these amino acids are changed to histidine, methionine, and leucine, respectively; (2) substitution of amino acids in the N-terminal region with amino acids from another xylanase enzyme. In a preferred embodiment, substitution of the natural Bacillus circulans or Trichoderma reesei xylanase with a short sequence of amino acids from Thermomonospora fusca xylanase yielded chimeric xylanases with higher thermophilicity and alkalophilicity; (3) an extension upstream of the N-terminus of up to 10 amino acids. In a preferred embodiment, extension of the N-terminus of the xylanase with the tripeptide glycine-arginine-arginine improved its performance.
    • 在木浆漂白中生产出优异的木聚糖酶。 更具体地,与天然木聚糖酶相比,家族11的改性木聚糖酶显示出改善的嗜热性,嗜碱性和热稳定性。 修饰的木聚糖酶包含三种类型的修饰中的任何一种:(1)改变里氏木霉木聚糖酶II的氨基酸10,27和29或另一种家族11木聚糖酶的相应氨基酸,其中这些氨基酸被改变为组氨酸,甲硫氨酸, 和亮氨酸; (2)用来自另一种木聚糖酶的氨基酸取代N-末端区域中的氨基酸。 在一个优选的实施方案中,用热单孢菌木聚糖酶短链氨基酸取代天然环状芽孢杆菌或里氏木霉木聚糖酶得到具有较高嗜热性和嗜碱性的嵌合木聚糖酶; (3)N-末端上游至多10个氨基酸的延伸。 在优选的实施方案中,木聚糖酶的N-末端与三肽甘氨酸 - 精氨酸 - 精氨酸的延伸改善了其性能。