Hitachi, Ltd.

Kiyoshi Fujimori

Shinichi Fukuzono

Norio Shimizu

Yoji Odawara

Nobuko Nishimura

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.

Process for culturing recombinant cells

Cultivation of microorganisms or animal cells or plant cells is carried out to produce high density cultivation, high cell yield and high production of desired metabolite products by monitoring acetate concentration in culture broth and regulating assimilation of acetate in the culture broth by the microorganisms or animal cells or plant cells to control the acetate concentration to a set value or less. Preferably, an acetic acid-producing bacterium that is inhibited by acetic acid and is capable of assimilating acetic acid is cultured to produce biologically active substances such as enzymes. The bacterium may be a recombinant Escherichia coli and an inducer which acts on a promoter in an expression vector is added to produce the desired metabolite product. The inducer is 3-.beta.- indolylacrylic acid when the promoter is trp-promoter or isopropyl-.beta.-D-thiogalactoside when the promoter is lac-promoter or tacpromoter.

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Tokyo, Japan

Kiyoshi Fujimori