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    • 61. 发明申请
    • Process for producing lactonase and utilitzation thereof
    • 生产内酯酶的方法及其功效
    • US20090137012A1
    • 2009-05-28
    • US12232870
    • 2008-09-25
    • Sakayu ShimizuMichihiko KataokaKeiji Sakamoto
    • Sakayu ShimizuMichihiko KataokaKeiji Sakamoto
    • C12P17/04
    • C12P41/003C12N9/18C12P17/04
    • It has been required to economically produce a large amount of optically active γ-lactone derivatives (for example, pantolactone), which are useful as intermediates in synthesizing useful substances such as pharmaceutical drugs. To achieve this object, it is advantageous to employ an enzymatic technique of asymmetric hydrolysis with a hydrolyzing enzyme lactonase. However, it remains troublesome to prepare the enzyme or utilize a microorganism capable of producing the enzyme. Also, it is difficult to obtain a sufficient and stable enzymatic activity in the case of using recombination techniques. In producing lactonase, which asymmetrically hydrolyzes a γ-lactone derivative such as racemic pantolactone selectively, by a recombination technique, both mature lactonase DNA and signal peptide region DNA are transferred into a host. Thus, a stable lactonase activity comparable to naturally-occurring one can be achieved and a transformant sustaining a high enzyme activity in a stable manner can be acquired, thereby allowing the efficient and industrially advantageous asymmetric synthesis of γ-lactone derivatives.
    • 需要经济地生产大量的用作合成有用物质如药物的中间体的光学活性γ-内酯衍生物(例如泛酸内酯)。 为了达到这个目的,使用水解酶内酯酶的不对称水解酶技术是有利的。 然而,制备酶或利用能够产生酶的微生物仍然是麻烦的。 此外,在使用重组技术的情况下,难以获得足够稳定的酶活性。 在制备内含子选择性地水解γ-内酯衍生物如外消旋泛酸内酯的内切酶中,通过重组技术,将成熟内含酶DNA和信号肽区DNA两者转移到宿主中。 因此,可以获得与天然存在的活性相当的稳定的内含酶活性,并且可以获得以稳定的方式维持高酶活性的转化体,从而允许有效和工业上有利的γ-内酯衍生物的不对称合成。