Bacteriophage-triggered cell suicide systems and fermentation methods
employing the same
    5.
    发明授权
    Bacteriophage-triggered cell suicide systems and fermentation methods employing the same 失效
    噬菌体触发的细胞自杀系统和使用其的发酵方法

    公开(公告)号:US5792625A

    公开(公告)日:1998-08-11

    申请号:US709616

    申请日:1996-09-09

    CPC分类号: C12N15/70 C12N15/746 C12N9/22

    摘要: Described herein is a bacterial cell containing a recombinant bacteriophage defense mechanism. The defense mechanism comprises a bacteriophage promoter (e.g., a phage .phi.31 promoter; a T7 promoter) operatively associated with a heterologous DNA encoding a product lethal to the bacterial cell. The bacterial cell is susceptible to infection by a bacteriophage, and the promoter is activated upon the infection of said bacterial cell by that bacteriophage. Bacteria useful in carrying out the invention include both gram negative and gram positive bacteria (e.g., Lactococcus lactis; Escherichia coli); the heterologous DNA may encode an enzyme that degrades nucleic acid (e.g., the products of the LlaI restriction cassette; barnase). Recombinant DNAs useful for making the foregoing cells, cultures prepared from such cells, and fermentation methods carried out with such cells are also disclosed.

    摘要翻译: 本文描述的是含有重组噬菌体防御机制的细菌细胞。 防御机制包括与编码对细菌细胞致死的产物的异源DNA可操作地相关的噬菌体启动子(例如噬菌体phi 31启动子; T7启动子)。 细菌细胞易受噬菌体的感染,并且在通过该噬菌体感染所述细菌细胞时启动子被活化。 可用于实施本发明的细菌包括革兰氏阴性和革兰氏阳性细菌(例如乳酸乳球菌;大肠杆菌); 异源DNA可以编码降解核酸的酶(例如,LlaI限制性盒带的产物;芽孢杆菌RNA酶)。 还公开了可用于制备上述细胞的重组DNA,由这种细胞制备的培养物和用这种细胞进行的发酵方法。