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    • 23. 发明授权
    • Oxidatively stable alpha-amylase
    • 氧化稳定的α-淀粉酶
    • US06297037B1
    • 2001-10-02
    • US08194664
    • 1994-02-10
    • Christopher C. BarnettColin MitchinsonScott D. PowerCarol A. Requadt
    • Christopher C. BarnettColin MitchinsonScott D. PowerCarol A. Requadt
    • C12N928
    • C12N9/2417C11D3/386C12N15/75C12P19/14
    • Novel alpha-amylase mutants derived from the DNA sequences of naturally occurring or recombinant alpha-amylases are disclosed. The mutant alpha-amylases, in general, are obtained by in vitro modifications of a precursor DNA sequence encoding the naturally occurring or recombinant alpha-amylase to generate the substitution (replacement) or deletion of one or more oxidizable amino acid residues in the amino acid sequence of a precursor alpha-amylase. Such mutant alpha-amylases have altered oxidative stability and/or altered pH performance profiles and/or altered thermal stability as compared to the precursor. Also disclosed are detergent and starch liquefaction compositions comprising the mutant amylases, as well as methods of using the mutant amylases.
    • 公开了衍生自天然存在或重组α-淀粉酶的DNA序列的新型α-淀粉酶突变体。 通常,通过体外修饰编码天然存在或重组α-淀粉酶的前体DNA序列以产生氨基酸中一个或多个可氧化氨基酸残基的取代(置换)或缺失,获得突变体α-淀粉酶 前体α-淀粉酶的序列。 与前体相比,这种突变型α-淀粉酶具有改变的氧化稳定性和/或改变的pH性能特征和/或改变的热稳定性。 还公开了包含突变淀粉酶的洗涤剂和淀粉液化组合物,以及使用突变淀粉酶的方法。
    • 26. 发明授权
    • Hybrid alpha-amylases
    • 混合型α-淀粉酶
    • US08841107B2
    • 2014-09-23
    • US13132881
    • 2009-12-11
    • Scott D. PowerAndrew Shaw
    • Scott D. PowerAndrew Shaw
    • C12N9/96C12N9/00C12N9/28
    • C12N9/2417C07K2319/00G06F19/12G06F19/16
    • Hybrid alpha-amylases are provided that share a conserved 3D structure in whole or in part with a wild-type Termamyl-like ?-amylase, e.g., a Bacillus amylase. In the hybrid, an N terminal portion of a Termamyl-like ?-amylase is replaced with sequences from an archae ? amylase. The sequence similarity between the two amylase sequences may be less than 60%. Conserving the wild-type 3D structure in the hybrid facilitates obtaining enzymatically active amylases. In one embodiment, one or both amylase sequences contribute residues to the B domain, resulting in particularly advantageous properties. For instance, replacement of the Ca2+ binding site in the B domain of the Termamyl-like ?-amylase with a B domain sequence of an archae ? amylase that does not bind Ca2+ can produce a hybrid that is fully active in the absence of Ca2+.
    • 提供杂交α-淀粉酶,其与野生型类戊酰样α-淀粉酶(例如芽孢杆菌淀粉酶)全部或部分共享保守的3D结构。 在杂交体中,类戊酰样α-淀粉酶的N末端部分被来自古细菌的序列替代 淀粉酶。 两个淀粉酶序列之间的序列相似性可以小于60%。 在杂交中保护野生型3D结构有助于获得酶活性淀粉酶。 在一个实施方案中,一个或两个淀粉酶序列向B结构域贡献残基,导致特别有利的性质。 例如,用具有古细菌的B结构域序列的Termamyl样α-淀粉酶的B结构域中的Ca 2+结合位点的替换 不结合Ca2 +的淀粉酶可以产生在不存在Ca 2+的情况下完全活性的杂交体。