摘要:
By culturing E. coli bearing a DNA sequence comprising a tryptophan regulatory gene, a gene coding for the N-terminal of trpE or trpL polypeptide and a specific synthetic gene coding for human epidermal growth factor, hEGF can be obtained as fused protein efficiently. hEGF can also be obtained as matured protein efficiently by culturing E. coli bearing a DNA sequence comprising a tryptophan regulatory gene, SD sequence of tryptophan L or E, ATG and a specific synthetic gene coding for human epidermal growth factor immediately downstream said ATG. Thus obtained hEGF is applicable to treatment of gastric ulcer or wounds.
摘要:
In a method for cultivation of microorganisms or animal cell or plant cells to produce metabolites, high density cultivation, high cell yield and high production of desired products can be achieved by performing cultivation through monitoring acetate concentration in culture broth and regulating assimilation of acetate in the culture broth by the microorganisms or animal cell or plant cells to control the acetate concentration to a set value or less, and as an apparatus for such cultivation, preferred is an apparatus comprising a culture tank for performing cultivation, an acetate concentration analyzer in culture broth, a substrate tank for storing substrate, a substrate feeding device of variable flow type for feeding substrate and a control device for outputting a signal for controlling a substrate flow from the substrate feeding device based on a signal from the analyzer.
摘要:
This invention relates to an efficient process for culturing recombinant cells which comprises a step of removing a cell proliferation inhibiting substance and/or a substance which inhibits induction of the desired product and a step of inducing production of the desired product.
摘要:
A method of controlling culture wherein cells are aerobically cultured to produce metabolite is characterized by adding substrate and/or inducer to the culture broth, judging the endpoint of the growth of the cells and/or the production of the metabolite or terminating the culture under the guidance of a change in the ratio of the first parameter based on the amount of carbon dioxide evolved by the cell culture to the second parameter based on the amount of oxygen consumed by the cell culture. The ratio is a respiratory quotient, for instance.
摘要:
By culturing E. coli carrying DNA encoding human nerve growth factor (hNGF) in a medium supplemented with 3-ß-indolylacrylic acid or containing no tryptophan, hNGF can be easily obtained as a fused protein in large quantities with a high efficiency. hNGF is applicable for the treatment of neuropathy.