Mutants of formate dehydrogenase from Candida boidinii, new gene sequences encoding these and use of the new formate dehydrogenases
    2.
    发明授权
    Mutants of formate dehydrogenase from Candida boidinii, new gene sequences encoding these and use of the new formate dehydrogenases 失效
    来自念珠菌的甲酸脱氢酶突变体,编码这些新基因序列和使用新的甲酸脱氢酶

    公开(公告)号:US06242234B1

    公开(公告)日:2001-06-05

    申请号:US09203893

    申请日:1998-12-02

    IPC分类号: C12N906

    CPC分类号: C12N9/0008

    摘要: The invention relates to new mutants of formate dehydrogenase from Candida boidinii, new gene sequences encoding these and use of the new formate dehydrogenases. The wild type FDH used hitherto in the industrial process for preparing amino acids becomes inactive after a certain time. New mutants of this wild type have been produced by targeted mutagenesis of a recombinant FDH from E. coli. The new mutants are preferably used in an enzymatic process for preparing chiral compounds.

    摘要翻译: 本发明涉及来自布氏念珠菌的甲酸脱氢酶的新突变体,编码它们的新基因序列和新甲酸脱氢酶的用途。迄今用于制备氨基酸的工业过程中使用的野生型FDH在一定时间后变得不活跃。 已经通过来自大肠杆菌的重组FDH的靶向诱变产生了该野生型的新突变体。 新的突变体优选用于制备手性化合物的酶法。

    Process for obtaining acyloins, pyruvate decarboxylases suitable
therefor and their production and DNA sequence of the PDC gene coding
them
    3.
    发明授权
    Process for obtaining acyloins, pyruvate decarboxylases suitable therefor and their production and DNA sequence of the PDC gene coding them 失效
    获得适宜的丙交酯丙酮酸脱羧酶的方法及其编码它们的PDC基因的生产和DNA序列

    公开(公告)号:US6004789A

    公开(公告)日:1999-12-21

    申请号:US976852

    申请日:1997-11-24

    CPC分类号: C12P7/26 C12N9/88

    摘要: A process for obtaining a pyruvate decarboxylase by isolation from a producer organism. The pyruvate decarboxylase is capable of forming (R)-(-)-phenylacetylcarbinole (I) in .gtoreq.95% enantiomer unit with a product ratio of (I) to 2-hydoxypropiophenone of .gtoreq.95%. In addition, the pyruvate decarboxylase has a specific activity with regard to phenylacetylcarbinole formation of >1U/mg. It is the aim of the invention to obtain a pyruvate decarboxylase with improved synthesis capacity concerning the formation of (R)-(-)-phenylacetylcarbinole. The process of the invention developed for this purpose is characterized in that use is made of a producing organism with a gene coding for pyruvate decarboxylase from Zymomonas mobilis, in the DNA sequence of which the tryptophane radical coding codon TGG is replaced at position 1174-1176 by a codon which codes for an amino acid radical with a reduced volume ratio.

    摘要翻译: 通过从生物体生物分离获得丙酮酸脱羧酶的方法。 丙酮酸脱羧酶能够在≥95%对映异构体单元中形成(R) - ( - ) - 苯乙酰基咔咔啉(I),产物比例为(I)至2-羟基苯丙酮≥95%。 此外,丙酮酸脱羧酶对于苯乙酰咔啉形成> 1U / mg具有比活性。 本发明的目的是获得关于形成(R) - ( - ) - 苯基乙酰基咔啉的合成能力提高的丙酮酸脱羧酶。 为此目的开发的本发明的方法的特征在于使用具有编码来自运动发酵单胞菌的丙酮酸脱羧酶的基因的生产生物体,其DNA序列在1174-1176位置替代色氨酰基编码密码子TGG 通过编码具有减小的体积比的氨基酸基团的密码子。