Method for increasing the yield of recombinant proteins in...

C - Chemistry – Metallurgy – 12 – P

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C12P 21/02 (2006.01) C12M 1/36 (2006.01) C12N 1/20 (2006.01) C12N 1/21 (2006.01)

Patent

CA 2383831

The use of prior art methods for producing recombinant proteins in fed-batch fermentations often results, after the induction of the recombinant product synthesis, in an overgrowth of the culture due to plasmid-free cells and leads to a reduction of the specific product yield. The yield of recombinant proteins is thus increased by lowering or increasing, in a constantly brief manner, the concentration of the carbon/energy source in the culture. The oscillations are generated by altering the dosage rate of the feed solutions containing the carbon/energy source. This method is suited for all microorganisms which are cultivated using carbon-limited fed-batch.

Lors de la production de protéines de recombinaison dans des fermentations à écoulement discontinu, les procédés connus entraînent souvent, après induction de la synthèse de produits de recombinaison, une croissance trop forte de la culture due aux cellules exemptes de plasmides et une réduction du rendement du produit spécifique. Selon la présente invention, le rendement de protéines de recombinaison est augmenté du fait que la concentration de la source d'énergie/de carbone dans la culture est augmentée ou diminuée constamment sur un court laps de temps. Les oscillations sont produites par la modification de la cadence d'addition des solutions nutritives contenant la source d'énergie/de carbone. Ledit procédé est approprié pour tous les micro-organismes qui sont cultivés par écoulement discontinu avec limitation du carbone.

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