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    • 9. 发明授权
    • Polypeptides having phytase activity and polynucleotides encoding same
    • 具有植酸酶活性的多肽和编码其的多核苷酸
    • US08101391B2
    • 2012-01-24
    • US12022221
    • 2008-01-30
    • Carsten SjoeholmSoeren Flensted LassenLars Kobberoe SkovLeonardo De Maria
    • Carsten SjoeholmSoeren Flensted LassenLars Kobberoe SkovLeonardo De Maria
    • C12N9/16
    • C12N9/16A23L33/18C12N15/8243C12P7/06Y02E50/17
    • The present invention relates to polypeptides having phytase activity. These polypeptides have an amino acid sequence which has at least 70% identity to either of three phytases derived from the bacterium Buttiauxella, and which comprises at least one of the following amino acids at the position indicated: 119N, 120L, and/or 121E. These phytases have an improved specific activity. Additional specific amino acid substitutions are also disclosed which characterize and distinguish additional phytases of the invention having improved properties such as temperature and/or pH stability, pH activity profile, temperature activity profile, substrate profile, improved performance in animal feed in vitro or in vivo. The invention also relates to isolated polynucleotides encoding the polypeptides, nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods for producing and using the polypeptides.
    • 本发明涉及具有植酸酶活性的多肽。 这些多肽具有与来自细菌Buttiauxella的三种植酸酶中的任一种具有至少70%同一性的氨基酸序列,并且其在所示位置包含至少一个以下氨基酸:119N,120L和/或121E。 这些植酸酶具有改善的比活性。 还公开了另外的特定氨基酸取代,其特征和区分本发明的另外的植酸酶具有改善的性质如温度和/或pH稳定性,pH活性曲线,温度活性分布,底物分布,动物饲料体外或体内改善的性能 。 本发明还涉及编码多肽的分离的多核苷酸,核酸构建体,载体和包含多核苷酸的宿主细胞以及产生和使用多肽的方法。