tdcBC/pckA gene-inactivated microorganism and method of producing L-threonine using the same
    1.
    发明授权
    tdcBC/pckA gene-inactivated microorganism and method of producing L-threonine using the same 有权
    tdcBC / pckA基因灭活的微生物和使用其生产L-苏氨酸的方法

    公开(公告)号:US07485450B2

    公开(公告)日:2009-02-03

    申请号:US10817044

    申请日:2004-04-02

    IPC分类号: C12N1/20

    CPC分类号: C12P13/08 C12N9/88

    摘要: The present invention provide a microorganism comprising an inactivated chromosomal tdcBC gene and an inactivated chromosomal pckA gene, which has remarkably improved productivity of L-threonine. Also, the present invention provides a method of producing L-threonine using the microorganism. The microorganism is prepared by incorporating by a recombination technique an antibiotic resistance gene into a pckA gene on the chromosome of a bacterial strain containing an L-threonine degradation-associated operon gene, tdcBC, which is inactivated. The microorganism has the effect of preventing degradation and intracellular influx of L-threonine due to the inactivation of the tdcBC operon gene, and includes more activated pathways for L-threonine biosynthesis. Therefore, the microorganism is useful for mass production of L-threonine because of being capable of producing L-threonine in high levels and high yields even in the presence of high concentrations of glucose.

    摘要翻译: 本发明提供了包含灭活的染色体tdcBC基因和灭活的染色体pckA基因的微生物,其显着提高了L-苏氨酸的生产率。 另外,本发明提供使用该微生物生产L-苏氨酸的方法。 通过重组技术将抗生素抗性基因并入包含失活的L-苏氨酸降解相关操纵子基因tdcBC的细菌菌株的染色体上的pckA基因中来制备微生物。 该微生物具有防止由于tdcBC操纵子基因失活引起的L-苏氨酸的降解和细胞内流入的作用,并且包括用于L-苏氨酸生物合成的更多活化途径。 因此,即使在高浓度葡萄糖的存在下,微生物也能够以高水平和高产率生产L-苏氨酸,因此可用于批量生产L-苏氨酸。

    Method for producing L-threonine
    2.
    发明授权
    Method for producing L-threonine 有权
    生产L-苏氨酸的方法

    公开(公告)号:US07074602B2

    公开(公告)日:2006-07-11

    申请号:US10916804

    申请日:2004-08-12

    CPC分类号: C12P13/08

    摘要: An L-threonine-producing Escherichia coli strain and a method for producing the same are provided. The Escherchia coli strain contains chromosomal DNA with inactivated metJ gene. Therefore, expression repression of threonine biosynthesis genes by a metJ gene product is prevented, thereby producing a high concentration of threonine. Further, a high concentration of L-threonine can be produced in high yield using the method.

    摘要翻译: 提供了产生L-苏氨酸的大肠杆菌菌株及其制备方法。 大肠埃希氏菌菌株含有具有灭活的metJ基因的染色体DNA。 因此,通过metJ基因产物抑制苏氨酸生物合成基因的表达抑制,从而产生高浓度的苏氨酸。 此外,可以使用该方法以高产率制备高浓度的L-苏氨酸。

    Method for L-threonine production
    3.
    发明授权
    Method for L-threonine production 有权
    L-苏氨酸生产方法

    公开(公告)号:US07378267B1

    公开(公告)日:2008-05-27

    申请号:US10508728

    申请日:2002-05-16

    IPC分类号: C12N1/12 C12P13/04

    CPC分类号: C12P13/08

    摘要: A method for producing L-threonine using a microorganism is provided. In the method, the threonine dehydratase (tdc) gene existing in the genomic DNA of the microorganism is partially deactivated using a recombination technique. For a microorganism strain with enhanced activity of threonine operon-containing enzymes and the phosphoenolpyruvate carboxylase (ppc) gene, the tdc gene engaged in one of the four threonine metabolic pathways is specifically deactivated, thereby markedly increasing the yield of L-threonine.

    摘要翻译: 提供了使用微生物生产L-苏氨酸的方法。 在该方法中,存在于微生物的基因组DNA中的苏氨酸脱水酶(tdc)基因使用重组技术部分失活。 对于具有苏氨酸操纵子的酶和磷酸烯醇丙酮酸羧化酶(ppc)基因的活性增强的微生物菌株,特异性地去除了四种苏氨酸代谢途径之一的tdc基因,从而显着增加了L-苏氨酸的产量。