Uncoupling growth and protein production

    公开(公告)号:US11046963B2

    公开(公告)日:2021-06-29

    申请号:US15569024

    申请日:2016-04-29

    摘要: The present invention is in the field of recombinant biotechnology, in particular in the field of protein expression. The invention generally relates to methods of increasing the expression level of a protein of interest of a bacterial host cell in a production process. The invention relates particularly to improving the capacity of a bacterial host cell to express a protein of interest by expressing a phage protein during the production process which inhibits growth of the bacterial host cell. Decoupling growth of the bacterial host cell of manufacturing of the protein of interest during the production process reduces (i) the metabolic burden, (ii) oxygen demand, (iii) metabolic heat development, and (iv) avoids stress response caused by heterologous protein expression and thereby increases the capacity of a host cell to produce the protein of interest. The present invention also relates to uses of the host cell for protein expression, cell culture technology, and more specifically to culturing host cells to produce a protein of interest.

    Single-Cell Factory for Efficiently Synthesizing alpha-aminobutyric Acid and Construction and Application thereof

    公开(公告)号:US20190161779A1

    公开(公告)日:2019-05-30

    申请号:US16063651

    申请日:2016-11-17

    IPC分类号: C12P13/04 C12N15/73

    摘要: The present invention discloses a single-cell factory for efficiently synthesizing α-aminobutyric acid and construction and application thereof, which belong to the technical field of microorganisms. The present invention expresses an L-threonine deaminase gene, an L-amino acid dehydrogenase gene and a dehydrogenase gene for providing cofactor NADH cycle in tandem to construct a recombinant Escherichia coli single-cell factory which is used for efficiently synthesizing α-aminobutyric acid. The expression level of the L-threonine deaminase is optimized and controlled by an RBS sequence, so that the problem of transformation inhibition caused by the rapid accumulation of an intermediate product ketobutyric acid is solved, moreover, the expression level of the dehydrogenase for providing cofactor NADH cycle is optimized and controlled by a promoter and an RBS sequence, consequently, the NADH regeneration rate is increased, and ultimately, yield is increased. Utilizing the single-cell factory to carry out whole-cell transformation can reduce obstacles to substances getting in and out, increase the transformation rate and promote the intracellular cycle of cofactors without requiring exogenous addition, and the cost is low. Within 20 h, the yield of the recombinant Escherichia coli single-cell factory in a 5 L fermentation tank is 204 g·L−1, the space-time yield is 10.2 g·L−1·h−1, and a practical effective strategy is provided for industrialized production

    UNCOUPLING GROWTH AND PROTEIN PRODUCTION
    6.
    发明申请

    公开(公告)号:US20180282737A1

    公开(公告)日:2018-10-04

    申请号:US15569024

    申请日:2016-04-29

    发明人: Juergen MAIRHOFER

    IPC分类号: C12N15/73 C12N9/12 C07K14/005

    摘要: The present invention is in the field of recombinant biotechnology, in particular in the field of protein expression. The invention generally relates to methods of increasing the expression level of a protein of interest of a bacterial host cell in a production process. The invention relates particularly to improving the capacity of a bacterial host cell to express a protein of interest by expressing a phage protein during the production process which inhibits growth of the bacterial host cell. Decoupling growth of the bacterial host cell of manufacturing of the protein of interest during the production process reduces (i) the metabolic burden, (ii) oxygen demand, (iii) metabolic heat development, and (iv) avoids stress response caused by heterologous protein expression and thereby increases the capacity of a host cell to produce the protein of interest. The present invention also relates to uses of the host cell for protein expression, cell culture technology, and more specifically to culturing host cells to produce a protein of interest.