Preparation of (E)- and (Z)-2-methyl-2-butenoic acids
    25.
    发明授权
    Preparation of (E)- and (Z)-2-methyl-2-butenoic acids 失效
    (E) - 和(Z)-2-甲基-2-丁烯酸的制备

    公开(公告)号:US07285410B2

    公开(公告)日:2007-10-23

    申请号:US11585036

    申请日:2006-10-23

    摘要: A method has been developed to prepare (E)- and (Z)-2-methyl-2-butenoic acids (2M2BA) from a mixture of (E,Z)-2-methyl-2-butenenitriles (2M2BN) by the regioselective hydrolysis of (E)-2M2BN to (E)-2-methyl-2-butenoic acid (2M2BA) using enzyme catalysts having either a nitrilase activity or a combination of nitrile hydratase and amidase activities. The method provides high yields without significant conversion of (Z)-2M2BN to (Z)-2M2BA. The regioselective hydrolysis of (E)-2M2BN to (E)-2M2BA makes possible the facile separation of (E)-2M2BA from (Z)-2M2BN or (Z)-2-methyl-2-butenamide (2M2BAm), and the subsequent conversion of (Z)-2M2BN or (Z)-2M2BAm to (Z)-2M2BA.

    摘要翻译: 已经开发了一种由(E,Z)-2-甲基-2-丁烯腈(2M 2 BN)的混合物通过区域选择性制备(E) - 和(Z)-2-甲基-2-丁烯酸(2M 2 BA)的方法 使用具有腈水解酶活性或腈水合酶和酰胺酶活性的组合的酶催化剂将(E)-2M2BN水解成(E)-2-甲基-2-丁烯酸(2M2BA)。 该方法提供高产率而不显着转化(Z)-2M2BN至(Z)-2M2BA。 (E)-2M2BN至(E)-2M2BA的区域选择性水解使(E)-2M2BA与(Z)-2M2BN或(Z)-2-甲基-2-丁烯酰胺(2M2BAm)的容易分离成为可能, 随后将(Z)-2M2BN或(Z)-2M2BAm转化为(Z)-2M2BA。

    Temperature sensitive mutant derivatives of the broad host range plasmid pBHR1
    30.
    发明授权
    Temperature sensitive mutant derivatives of the broad host range plasmid pBHR1 失效
    宽宿主范围质粒pBHR1的温度敏感突变体衍生物

    公开(公告)号:US07045338B2

    公开(公告)日:2006-05-16

    申请号:US10378967

    申请日:2003-03-04

    IPC分类号: C12N1/21 C12N15/63 C12N15/11

    CPC分类号: C12N15/69 C12N15/70

    摘要: The present invention describes a mutant plasmid replication control region having the ability to convey temperature sensitivity to the plasmid on which it resides. The mutant replication control region is based on a similar region isolated from pBRH1. Plasmids containing this rggeplication control region cannot be classed as belonging to any known incompatibility group and thus may co-exist with a broad range of other plasmids in a single host.

    摘要翻译: 本发明描述了具有将温度敏感性传递给其所在质粒的突变质粒复制控制区。 突变体复制控制区域基于与pBRH1分离的相似区域。 含有该rggeplication对照区的质粒不能归类为任何已知的不相容性基团,因此可以与单个宿主中的宽范围的其他质粒共存。