ENGINEERING BACTERIA FOR PRODUCING DL-ALANINE AND METHOD FOR PRODUCING DL-ALANINE BY USING ENGINEERING BACTERIA
    34.
    发明申请
    ENGINEERING BACTERIA FOR PRODUCING DL-ALANINE AND METHOD FOR PRODUCING DL-ALANINE BY USING ENGINEERING BACTERIA 审中-公开
    用于生产DL-ALANINE的工程细菌和使用工程细菌生产DL-ALANINE的方法

    公开(公告)号:US20150247174A1

    公开(公告)日:2015-09-03

    申请号:US14395187

    申请日:2012-12-28

    摘要: The present invention discloses a DL-alanine-producing engineering bacterium. This DL-alanine-producing engineering bacterium itself was inactivated in lactate dehydrogenase, pyruvate formate lyase, alcohol dehydrogenase, acetate kinase, fumarate reductase, alanine racemase, and methylglyoxal synthase; moreover, onto the chromosome thereof an exogenous L-alanine dehydrogenase gene and alanine racemase gene were integrated. In the present application, by integrating the exogenous L-alanine dehydrogenase gene into the chromosome of the engineering bacterium, the intermediate of glycolysis, pyruvic acid, was converted into L-alanine; by further integrating the exogenous alanine racemase gene, partial L-alanine was converted into D-alanine, achieving the direct production of DL-alanine from raw material saccharides, thereby decreasing the production cycle of DL-alanine, and increasing the yield of DL-alanine.

    摘要翻译: 本发明公开了一种DL-丙氨酸生产工程菌。 这种DL-丙氨酸生产工程细菌本身在乳酸脱氢酶,丙酮酸甲酯裂解酶,醇脱氢酶,乙酸激酶,富马酸还原酶,丙氨酸消旋酶和甲基乙二醛合酶中失活; 此外,在其染色体上整合外源L-丙氨酸脱氢酶基因和丙氨酸消旋酶基因。 在本申请中,通过将外源L-丙氨酸脱氢酶基因整合到工程细菌的染色体中,将糖酵解中间体丙酮酸转化为L-丙氨酸; 通过进一步整合外源性丙氨酸消旋酶基因,将部分L-丙氨酸转化为D-丙氨酸,实现从原料糖直接生产DL-丙氨酸,从而降低DL-丙氨酸的生产周期,提高DL-丙氨酸的产量, 丙氨酸。